- Diastereoselective synthesis of a lilac aldehyde isomer and its electrophysiological detection by a moth
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The monoterpene lilac aldehyde (=2-(5-ethenyl-5-methyloxolan-2-yl)propanal) is a widespread flower scent. Lilac aldehyde is emitted in high amounts from nocturnal plant species, and it is highly attractive to nocturnal moth pollinators, such as Hadena bicruris, the pollinating seed predator of Silene latifolia. Lilac aldehyde possesses three stereogenic centers and can occur in eight stereoisomers which induce different antennal responses in H. bicruris. The distribution pattern of stereoisomers differs among plant species, and if H. bicruris has different receptors for detecting different isomers, it may use these differences to discriminate flowers of S. latifolia hosts from flowers of non-host plants. To investigate the question whether the moths have in their antennae one olfactory receptor or several different receptors for the detection of the single lilac aldehyde isomers, (2S,2′S,5′S)-lilac aldehyde was diastereoselectively synthesized. (2S,2′S,5′S)-Lilac aldehyde and its isomeric mixture were tested electrophysiologically on antennae of H. bicruris. The results displayed antennal responses, which are characteristic for a single receptor that detects the different lilac aldehyde isomers. Copyright
- Schneider, Marc-Andre,Doetterl, Stefan,Seifert, Karlheinz
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Read Online
- A facile method for Rh-catalyzed decarbonylativeortho-C-H alkylation of (hetero)arenes with alkyl carboxylic acids
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A facile and effective method for Rh-catalyzed directortho-alkylation of C-H bonds in (hetero)arenes with commercially available carboxylic acids has been developed. This strategy was initiated byin situconversion of carboxylic acids to anhydrides which, without isolation, underwent Rh-catalyzed direct decarbonylative cross-coupling of aryl carboxamides containing 8-aminoquinoline. The reaction proceeds with high regioselectivity and exhibits a broad substrate scope as well as functional group tolerance.
- Tian, Yiqiang,Liu, Xiaojie,He, Bangyue,Ren, Yuxi,Su, Weiping
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Read Online
- Generation of basic centers in high-silica zeolites and their application in gas-phase upgrading of bio-oil
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High-silica zeolites have been reported recently as efficient catalysts for liquid- and gas-phase condensation reactions because of the presence of a complementary source of basicity compared to Al-rich basic zeolites. Herein, we describe the controlled generation of these active sites on silica-rich FAU, BEA, and MFI zeolites. Through the application of a mild base treatment in aqueous Na2CO3, alkali-metal-coordinating defects are generated within the zeolite whereas the porous properties are fully preserved. The resulting catalysts were applied in the gas-phase condensation of propanal at 673 K as a model reaction for the catalytic upgrading of pyrolysis oil, for which an up to 20-fold increased activity compared to the unmodified zeolites was attained. The moderate basicity of these new sites leads to a coke resistance superior to traditional base catalysts such as CsX and MgO, and comparable activity and excellent selectivity is achieved for the condensation pathways. Through strategic acid and base treatments and the use of magic-angle spinning NMR spectroscopy, the nature of the active sites was investigated, which supports the theory of siloxy sites as basic centers. This contribution represents a key step in the understanding and design of high-silica base catalysts for the intermediate deoxygenation of crude bio-oil prior to the hydrotreating step for the production of second-generation biofuels. Creating new basic sites: Through activation treatments in alkaline media, basic sites with high activity, stability, and selectivity are generated in high-silica FAU, BEA, and MFI zeolites, which enable the efficient deoxygenation of pyrolysis oil by condensation reactions. Intermediate bio-oil upgrading is key for the sustainable and profitable production of advanced biofuels.
- Keller, Tobias C.,Rodrigues, Elodie G.,Perez-Ramirez, Javier
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Read Online
- Isothiourea-Catalyzed Atroposelective N-Acylation of Sulfonamides
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We report herein an atroposelective N-acylation of sulfonamides using a commercially available isothiourea catalyst, (S)-HBTM, with a simple procedure. The N-sulfonyl anilide products can be obtained in good to high enantiopurity, which represents a new axially chiral scaffold. The application of the product as a chiral iodine catalyst is also demonstrated for the asymmetric α-oxytosylation of propiophenone.
- Ong, Jun-Yang,Ng, Xiao Qian,Lu, Shenci,Zhao, Yu
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supporting information
p. 6447 - 6451
(2020/09/02)
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- Metal-free oxidative self-coupling of aldehydes or alcohols to symmetric carboxylic anhydrides
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A metal-free synthesis of symmetrical anhydrides has been developed starting from aldehydes, both aliphatic and aromatic or primary benzylic alcohols. The reaction occurs at room temperature and makes use of trichloroisocyanuric acid (TCCA) as an oxidant providing the desired carboxylic anhydrides in satisfactory yields.
- Gaspa, Silvia,Porcheddu, Andrea,De Luca, Lidia
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supporting information
p. 2533 - 2536
(2017/06/13)
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- Anhydrides from aldehydes or alcohols via oxidative cross-coupling
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A novel type of metal-free oxidative cross-coupling for the synthesis of symmetrical and mixed anhydrides from aldehydes or benzylic alcohols has been developed. The aldehydes or alcohols were converted in situ into their corresponding acyl chlorides, which were then reacted with an array of carboxylic acids. The methodology has a general applicability, and was successfully employed to prepare either aromatic or aliphatic symmetrical anhydrides and mixed anhydrides, which are very unstable compounds.
- Gaspa, Silvia,Amura, Ida,Porcheddu, Andrea,De Luca, Lidia
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supporting information
p. 931 - 939
(2017/02/10)
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- An anhydride producing method
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An anhydride producing method is disclosed. The method includes oxidizing a C2-C7 alcohol or a C2-C7 aldehyde under the existence of a catalyst and an oxidant to obtain an anhydride, wherein the reaction pressure is atmospheric pressure, the temperature is 50-200 DEG C, the hourly space velocity is 0.5-100 h, the catalyst is a supported type Pd catalyst and the oxidant is oxygen or air. The method adopts the oxygen as the oxidant, and achieves high-selectivity conversion of the alcohol or the aldehyde to the anhydride through an oxidizing manner. Anhydride selectivity is 10-85%. A substrate conversion rate is 10-100%. The yield of the anhydride is 10-85%. The method does not need a high reaction temperature and can be performed at room temperature or a temperature close to room temperature, thus saving a large amount of energy. The method is low in equipment requirement, low in investment, simple in reaction system and easy in industrialization. The catalyst is long in service lifetime and free of loss.
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Paragraph 0035; 0036
(2017/06/24)
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- Alcohol cross-coupling for the kinetic resolution of diols via oxidative esterification
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We present an organocatalytic C-O-bond cross-coupling strategy to kinetically resolve racemic diols with aromatic and aliphatic alcohols, yielding enantioenriched esters. This one-pot protocol utilizes an oligopeptide multicatalyst, m-CPBA as the oxidant, and N,N-diisopropylcarbodiimide as the activating agent. Racemic acyclic diols as well as trans-cycloalkane-1,2-diols were kinetically resolved, achieving high selectivities and good yields for the products and recovered diols.
- Hofmann, Christine,Schümann, Jan M.,Schreiner, Peter R.
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supporting information
p. 1972 - 1978
(2015/02/19)
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- Kinetic analysis of the HBTM-catalyzed esterification of an enantiopure secondary alcohol
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A detailed kinetic analysis of the homobenzotetramisole-mediated esterification of the enantiopure secondary alcohol (1R,2S)-2-phenylcyclohexanol is presented. The results of this analysis show that the reaction is first order in the homobenzotetramisole catalyst, first order in (1R,2S)-2- phenylcyclohexanol, and first order in propionic anhydride. Initial rates, the turnover frequency of the catalyst, and different excess plots were utilized in this evaluation. Additionally, a same excess plot revealed no noticeable catalyst decomposition or product inhibition during the course of the reaction.
- Wagner, Alexander J.,Rychnovsky, Scott D.
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supporting information
p. 5504 - 5507
(2013/11/19)
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- Ruthenium-catalyzed transvinylation - New insights
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The use of ruthenium complexes in transvinylation catalysis has been well established since the 1980s. However, the reaction mechanism and the active catalyst species, which is presumed to contain ruthenium carbonyl carboxylate entities, have so far remained elusive. In this work the synthesis and characterization of three novel ruthenium complexes comprising ruthenium carbonyl carboxylate structural motifs including two single crystal structures as well as the crystal structures of two known ruthenium complexes are reported. These new complexes and four known ruthenium complexes with appropriate structural motifs were applied in transvinylation catalysis. Mechanistic studies including identification and characterization of the active species, isotope labeling experiments and examination of the regioand stereoselectivity of the transvinylation reaction are presented, resulting in the proposal of a probable reaction mechanism, which is supported by DFT calculations on the B3LYP/6-31G* level of theory.
- Ziriakus, Jennifer,Zimmermann, Teresa K.,P?thig, Alexander,Drees, Markus,Haslinger, Stefan,Jantke, Dominik,Kühn, Fritz E.
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p. 2845 - 2859
(2014/03/21)
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- Efficient and convenient synthesis of symmetrical carboxylic anhydrides from carboxylic acids with sulfated zirconia by phase transfer catalysis
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An efficient and convenient procedure for the synthesis of symmetrical carboxylic anhydrides from carboxylic acids with sulfated zirconia by PEG-1000 phase transfer catalysis has been developed. The reactions proceeded under mild and solvent-free conditions to provide the carboxylic anhydrides in good to excellent yields. The product can be isolated by a simple extraction with organic solvent, and the catalyst system can be recycled or reused without any significant loss of catalytic activity.
- Hu, Yu Lin,Zhao, Xing E.,Lu, Ming
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experimental part
p. 255 - 262
(2012/04/17)
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- Synthesis of α-diazoketone by the action of diazoalkanes on propionic anhydride
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Propionic anhydride reacts with diazo-n-alkanes in dry ether at 0°C gave 1-diazo-1-n-alkyl butanones.
- Gupta, Shalini,Agarwal,Garg, Poonam
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body text
p. 2939 - 2942
(2010/11/05)
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- Charged sophorolipids and sophorolipid containing compounds
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A sophorolid produced by a method involving reacting a compound of formula I with a compound of formula II wherein R1 and R2 are H, C1-C18 alkyl, C3-C18 alkenyl, C3-C10 cycloalkyl, phenyl, or C1 through C18 acyl or alkoxycarbonyl, R1 and R2 are not both acyl, R3 is H, CH3, CH2-phenyl, CH2—C6H4—OH, CH2CO2H, CH2CH2CO2H, CH(CH3)2, CH2CH(CH3)2, CH(CH3)CH2CH3, CH2OH, CH(CH3)OH, CH2CH2CH2CH2NH2, CH2CH2CONH2, CH2CONH2, CH2—C3N2H3(histidine), CH2CH2CH2NHC(NH)NH2, CH2CH2SCH3, R2 and R3 may be joined in a ring, R4 is H, C1-C18 alkyl, C3-C18 alkenyl, C3-C10 cycloalkyl, or phenyl, n is 0-6, R5 and R6 are H, C1-C18 alkyl, C3-C18 alkenyl, C3-C10 cycloalkyl, or phenyl, and X is C1-C18 alkyl or C1-C18 alkenyl; optionally followed by acidolytic (treating with an acid) or hydrogenolytic deprotection (treating with a hydrogenolysis catalyst) which removes one of the groups R1 or R2 and replaces it with hydrogen. Also a sophorolipid containing composition containing a carrier and at least one sophorolipid described above.
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Page/Page column 6
(2010/11/25)
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- Investigation of the Yamaguchi esterification mechanism. Synthesis of a Lux-S enzyme inhibitor using an improved esterification method
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(Chemical Equation Presented) A one-pot procedure for the regioselective synthesis of aliphatic esters is described. This was a result of a study on mixed aliphatic-aromatic anhydrides. The data suggest that during the Yamaguchi esterification reaction, a symmetric aliphatic anhydride is produced in situ, which upon reaction with an alcohol yields the ester. We confirmed that benzoyl chloride could be used instead of the sterically hindered Yamaguchi acid chloride. This method was successfully applied in the synthesis of Lux-S aspartic acid inhibitor.
- Dhimitruka, Ilirian,SantaLucia Jr., John
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- PROCESS FOR PRODUCING ACID ANHYDRIDE
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According to the present invention there is provided a process for producing an acid anhydride by reacting a carboxylic acid, preferably a carboxylic acid having a polymerizable group, with a sulfonyl halide compound in the presence of a tertiary amine or in the presence of a tertiary amine and an inorganic base, wherein the tertiary amine or the tertiary amine and the inorganic base are used in an amount of 0.9 to 1.2 equivalents relative to the acid generated from the sulfonyl halide compound.
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- Method of preparing a benzofuran or benzothiophene compound
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The invention concerns a novel method for preparing a benzofuran or benzothiophene compound by cyclizing an aromatic compound bearing a side-chain comprising at least two carbon atoms, one of the carbon atoms being bound to the benzene cycle by an oxygen or sulphur atom, the other carbon atom is in carboxylic form and a formyl radical in ortho position relative to said chain. The inventive method is characterised in that it consists in cyclizing the latter in the presence of an efficient amount of a carbonate base in a medium comprising a carboxylic acid anhydride and optionally an organic solvent.
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- Method for preparing a benzylic-type ether
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The invention concerns a method for preparing a benzylic-type ether from an aromatic compound. The inventive method for preparing a benzylic-type ether from an aromatic compound is characterised in that it consists in: in a first step, acylating an aromatic compound by reacting said aromatic compound with an acylating agent, in the presence of an efficient amount of zeolite or a Friedel-Crafts catalyst leading to a ketonic compound; in a second step, reducing the carbonyl group into carbinol leading to a benzylic alcohol; in a third step, etherifying the hydroxyl group, by reacting the benzylic alcohol with another alcohol, in the presence of an efficient amount of zeolite.
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- Process facilitating the regeneration of a catalyst based on a zeolite used in an acylation reaction, catalyst and use
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The present invention relates to a process facilitating the regeneration of a catalyst based on a zeolite, employed in an acylation reaction. Another subject of the invention is a process for acylation of an aromatic ether, comprising, in a preferred alternative form, an additional stage of regeneration of the catalyst. The process of the invention, which makes it possible to regenerate more easily a catalyst based on a zeolite, employed in an acylation reaction, is characterized in that the zeolite is modified by addition of an effective quantity of at least one metallic element M chosen from the elements of group 8 of the Periodic Classification of the elements.
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- Acylation method for an aromatic compound
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The present invention concerns a process for acylation of an aromatic compound.The acylation process of the invention consists of reacting the aromatic compound with an acylation agent in the presence of a zeolitic catalyst, and is characterized in that it consists of:mixing the aromatic compound and the acylation compound in any manner;passing said mixture over a catalytic bed comprising at least one zeolite;recirculating the reaction mixture from the catalytic bed over the catalytic bed for a number of times which is sufficient to obtain the desired degree of conversion of the substrate.
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- Process for the acylation of aromatic ethers
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The present invention concerns a process for the acylation of an aromatic ether. Preferably the invention relates to a process for the acylation of a substituted aromatic ether, in particular veratrol. The acylation process of the invention consists of reacting the ether with an acylation agent in the presence of a zeolitic catalyst, and is characterized in that the acylation reaction is carried out in the presence of an effective quantity of a catalyst comprising a faujasite type zeolite or a Y zeolite with the following physico-chemical characteristics: an atomic ratio denoted "global Si/Me1 " between the number of atoms of the element silicon and the number of atoms of every trivalent element Me1 contained in the zeolite in the range 2.4 to 90, preferably in the range 2.4 to 75, and more preferably in the range 2.4 to 60; an Me2 alkali metal content such that the atomic ratio Me2 /Me1(IV) between the number of atoms of alkali metal Me2 and the number of atoms of every trivalent element Me1(IV) included in the zeolitic network is less than 0.2, preferably less than 0.1, and more preferably less than 0.05.
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- Aromatic thioether acylation method
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PCT No. PCT/FR96/01763 Sec. 371 Date Aug. 3, 1998 Sec. 102(e) Date Aug. 3, 1998 PCT Filed Nov. 8, 1996 PCT Pub. No. WO97/17324 PCT Pub. Date May 15, 1997The present invention relates to a process for the acylation of an aromatic thioether. In its preferred variant, the invention resides in a process for the condensation of acetic anhydride or acetyl chloride with thioanisole. The process for the acylation of an aromatic thioether according to the invention is characterised in that it consists in reacting said thioether with an acylating agent chosen from the group formed by the halides of carboxylic acids and the anhydrides of carboxylic acids, in the presence of an effective quantity of an acid zeolite.
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- Process for the acylation of aromatic ethers
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The present invention concerns a process for the acylation of an aromatic ether. Preferably, the invention relates to a process for the acylation of an unsubstituted aromatic ether, in particular anisole. The acylation process of the invention consists of reacting the ether with an acylation agent in the presence of a zeolitic catalyst, and is characterized in that the acylation reaction is carried out in the presence of an effective quantity of a catalyst comprising a beta zeolite with an atomic ratio denoted "global Si/Me1 " between the number of atoms of the element silicon and the number of atoms of every trivalent element Me1 contained in the zeolite of no less than 15, preferably in the range 15 to 55, and more preferably in the range 18 to 35.
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- Ozonolyses of Acetylenes: Trapping of α-Oxo Carbonyl Oxides by Carbonyl Compounds and Stabilization of α-Oxo Ozonides by Derivatizations
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Ozonolyses of 2-butyne (7) or of 3-hexyne (14) in the presence of carbonyl compounds (aldehydes, ketones, acid derivatives) afforded the corresponding mostly labile monocyclic α-oxo ozonides (9, 13a, 16), which could be stabilized and, hence, isolated by subsequent conversion into α-methoximino derivatives. Ozonolyses of 1,4-diacyloxy-substituted (19) and 1-acyloxy-substituted 2-butynes (27) gave bicyclic ozonides (22,31) by intramolecular [3 + 2]-cycloadditions of the corresponding carbonyl oxide intermediates (20, 29). These ozonides could also be stabilized by reactions with O-methylhydroxylamine to give O-methyloximes (23c, 32) or with diazomethane to give epoxy ozonides (25, 34).
- Griesbaum, Karl,Dong, Yuxiang,McCullough, Kevin J.
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p. 6129 - 6136
(2007/10/03)
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- A search for quantitative acylation of α-trinositol (1D-myo-inositol 1,2,6-tris(dihydrogen phosphate) pentasodium salt)
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The acylation of α-trinositol is very sensitive to reaction conditions. Competing condensation reactions may give pyrophosphates and cyclic phosphates. Treatment of a tert-ammonium salt corresponding to α-trinositol with carboxylic acid anhydride and DMAP gives a good yield of the expected esters.
- Malmberg, Mats,Rehnberg, Nicola
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p. 459 - 464
(2007/10/03)
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- Cobalt(II)-Catalyzed Reaction of Enolizable Aldehydes with Alkenes in the Presence of Dioxygen: The Role of Acyl Radical
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Complex cobalt(II) (1) catalyzes the reaction of enolizable aliphatic aldehydes and dioxygen with an electron-deficient alkene to afford the adducts 4 and 5, whereas the reaction with unactivated alkenes leads to the corresponding epoxides 6.These reactions are proposed to proceed via a common pathway involving acyl radicals.
- Punniyamurthy, T.,Bhatia, Beena,Iqbal, Javed
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p. 850 - 853
(2007/10/02)
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- Cobalt(II)-Catalyzed Reaction of Aldehydes with Acetic Anhydride under an Oxygen Atmosphere: Scope and Mechanism
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The reaction of aldehydes with acetic anhydride in the presence of catalytic cobalt(II) chloride under an oxygen atmosphere at ambient temperature is dependent upon the reaction medium.Aliphatic aldehydes react in acetonitrile to give 1,2-diones whereas the aromatic aldehydes are acylated to yield the corresponding acylals.On the other hand, carboxylic acids are obtained from aliphatic and aromatic aldehydes by conducting the reaction in dichloroethane or benzene.Cobalt(II) chloride in acetonitrile catalyzes the conversion of aliphatic aldehydes to the correspondinganhydrides in the absence of acetic anhydride whereas aromatic aldehydes remain largely unaffected under these conditions.A preliminary mechanistic study in three different solvents (i.e. acetonitrile, dichloroethane, and DMF) has revealed that in acetonitrile and in the presence of acetic anhydride, aliphatic aldehydes behave differently than aromatic aldehydes.Some trapping experiments using methyl acrylate and stilbene have been conducted to demonstrate the occurence of an acyl cobalt and peroxyacyl cobalt intermediate during these reactions.
- Bhatia, Beena,Punniyamurthy, T.,Iqbal, Javed
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p. 5518 - 5523
(2007/10/02)
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- Derivatives from 3,4-dehydro-piperidin-5-one exhibiting a herbicidal activity
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The present invention relates to derivatives of 3,4-dehydropiperidin-5-one having herbicidal activity. The derivatives have the formula STR1 as defined in the claims. The present invention further relates to a herbicidal composition and a method for controlling weeds which grow among agricultural crops.
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- REACTION OF PHOSPHORUS TRICHLORIDE WITH CARBOXYLIC ACIDS
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The reaction of phosphorus trichloride with a number of monobasic carboxylic acids has been studied and the optimum ratio of reactants for the yield of acid chlorides has been established.Based on analysis and the data from 31P NMR spectroscopy of the phosphorus-containing products from this reaction it is shown that at 40-50 deg C a mixture of P-H acids having a predominant content of pyrophosphorous acid is formed.
- Valitova, L. A.,Popova, E. V.,Ibragimov, Sh. N.,Ivanov, B. E.
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p. 366 - 370
(2007/10/02)
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- PHASE MANAGED ORGANIC SYNTHESIS 3. SYMMETRICAL ANHYDRIDES FROM CARBOXYLIC ACIDS VIA POLYMER ASSISTED REACTION.
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Symmetrical anhydrides are produced quickly and in high yield by treating mixtures of a carboxylic acid and one-half equivalent thionyl chloride in dichloromethane with a solid-state copolymer of 4-vinylpyridine.This conversion is accomplished equally well in batch or column mode.
- Fife, Wilmer K.,Zhang, Zhi-dong
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p. 4937 - 4940
(2007/10/02)
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- Carboxydiphenyl Phosphane Sulfides
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Carboxydiphenyl phosphane sulfides (C6H5)2P(S)(OC(O)R) (2) (R = CH3 2a, C2H5 2b, C17H35 2c, (CH3)3C 2d, C6H5 2e) were prepared by reacting silver salts of carboxylic acids AgOC(O)R with (C6H5)2P(S)Cl (Scheme 1) or by treating carboxylic acids with (C6H5)2P(S)Cl in the presence of triethyl amine (Scheme 2) and spectroscopically characterized.Thermal stability and stability against hydrolysis of the mixed anhydrides is unusually high. - Key words: Carboxydiphenyl Phosphane Sulfides, Thermal Stability
- Hennig, Heinz-Werner,Sartori, Peter,Steinbrecht, Ulrich
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p. 284 - 289
(2007/10/02)
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- Application of the Triphenylphosphine and Diethyl Azodicarboxylate to the Conversion of Carboxylic Acids. Synthesis of Acid Anhydrides
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A new application of the TPP-DEAD reagent has been described.The carboxylic acids undergo self-condensation which takes place during the reaction with betaine 1 and yield acid anhydrides.This synthesis is simple, occurs under very mild conditions and appers to be general.The reaction was monitored by 31P spectroscopy and the mechanism involving the formation of unstable acyloxyphosphonium salts has been discussed.
- Grochowski, Edward,Stepowska, Halszka,Michejda, Cristopher J.
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p. 129 - 134
(2007/10/02)
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- KINETICS OF ADDITION OF THE ETHYL RADICALS TO FLUOROETHYLENES IN HEPTANE AND ISOOCTANE
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The thermal decomposition of propionyl peroxide in heptane and isooctane was used as a source of free ethyl radicals for kinetic investigations.The rate constants for the addition of C2H5. to ethylene, vinyl fluoride, vinylidene fluoride, trifluoroethylene, and tetrafluoroethylene in relation to the rate constants for the abstraction of a hydrogen atom from heptane at 65 deg C are 52.3, 24.0, 10, 84, and 1000 respectively.For ethylene, vinyl fluoride, and trifluoroethylene the relative addition rate constants were also determined in isooctane (178, 78, and 252).Itwas calculated that for the CH3., C2H5., and CF3. radicals the hydrogen abstraction rate from heptane is 3.3, 3.2, and 2.2 times higher respectively than from isooctane.In the investigated systems ethyl radicals exhibit stronger nucleophilic character than methyl radicals.
- Zhuravlev, M. V.,Serov, S. I.,Sass, V. P.,Sokolov, S. V.
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p. 1754 - 1757
(2007/10/02)
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- PREPARATION OF ACYL(CARBOXYLATO)NICKAL AND -PALLADIUM COMPLEXES M(COR) (OCOR')L2 (M = Ni, Pd) AND REVERSIBLE REDUCTIVE ELIMINATION OF CARBOXYLIC ANHYDRIDES, RCOOCOR'
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Acyl(carboxylato)nickel(II) and -palladium(II) complexes, M(COR) (OCOR')L2 2 are prepared by 1:1 reactions of MR(OCOR')L2 1 with CO at -78 deg C, whereas similar reactions in the presence of excess CO at room temperature afford the reductive elimination products, RCOOCOR'.Acid anhydrides add oxidatively to an Ni())-complex to afford a complex of the type 2.
- Komiya, Sanshiro,Yamamoto, Akio,Yamamoto, Takakazu
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p. 193 - 196
(2007/10/02)
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- ELECTROPHILIC ADDITION REACTIONS TO PHENYLACETYLENE CATALYZED BY HETEROPOLY ACID
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Heteropoly acid efficiently catalyzed the addition reactions of water and carboxylic acid to phenylacetylene to form acetophenone at 60 deg C in the liquid phase.The higher catalytic activity of heteropoly acid compared with H2SO4 and HClO4 is due to the cooperative action of heteropoly anion.
- Matsuo, Kazuhiro,Urabe, Kazuo,Izumi, Yusuke
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p. 1315 - 1316
(2007/10/02)
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