- Synthesis, neutron structure, and reactivity of the bis(dihydrogen) complex RuH2(η2-H2)2(PCyp 3)2 stabilized by two tricyclopentylphosphines
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Treatment of Ru(η4-C8H12)(η6-C8H10) with 3 bar H2 in the presence of 2 equiv of tricyclopentylphosphine (PCyp3) in pentane resulted in the isolation of the new bis(dih
- Grellier, Mary,Vendier, Laure,Chaudret, Bruno,Albinati, Alberto,Rizzato, Silvia,Mason, Sax,Sabo-Etienne, Sylviane
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Read Online
- Selective Electrochemical Oxygenation of Alkylarenes to Carbonyls
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An efficient electrochemical method for benzylic C(sp3)-H bond oxidation has been developed. A variety of methylarenes, methylheteroarenes, and benzylic (hetero)methylenes could be converted into the desired aryl aldehydes and aryl ketones in moderate to excellent yields in an undivided cell, using O2 as the oxygen source and lutidinium perchlorate as an electrolyte. On the basis of cyclic voltammetry studies, 18O labeling experiments, and radical trapping experiments, a possible single-electron transfer mechanism has been proposed for the electrooxidation reaction.
- Li, Xue,Bai, Fang,Liu, Chaogan,Ma, Xiaowei,Gu, Chengzhi,Dai, Bin
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supporting information
p. 7445 - 7449
(2021/10/02)
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- Investigations of the generality of quaternary ammonium salts as alkylating agents in direct C-H alkylation reactions: Solid alternatives for gaseous olefins
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C-H alkylation reactions using short chain olefins as alkylating agents could be operationally simplified on the lab scale by using quaternary ammonium salts as precursors for these gaseous reagents: Hofmann elimination delivers in situ the desired alkenes with the advantage that the alkene concentration in the liquid phase is high. In case a catalytic system did not tolerate the conditions for Hofmann elimination, a very simple spatial separation of both reactions, Hofmann elimination and direct alkylation, was achieved to circumvent possible side reactions or catalyst deactivation. Additionally, the truly catalytically active species of a rhodium(i) mediated alkylation reaction could be identified by using this approach.
- Sch?nbauer, David,Spettel, Manuel,Pollice, Robert,Pittenauer, Ernst,Schnürch, Michael
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supporting information
p. 4024 - 4030
(2019/04/29)
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- Quaternary Ammonium Salts as Alkylating Reagents in C-H Activation Chemistry
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A rhodium(I)-catalyzed alkylation reaction of benzylic amines via C(sp3)-H activation using quaternary ammonium salts as alkyl source is described. The reaction proceeds via in situ formation of an olefin via Hofmann elimination, which is the actual alkylating reagent. This represents an operationally simple method for substituting gaseous and liquid olefins with solid quaternary ammonium salts as alkylating reagents, which is transferable to other C-H activation protocols as well.
- Spettel, Manuel,Pollice, Robert,Schnürch, Michael
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p. 4287 - 4290
(2017/08/23)
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- A general and efficient suzuki-miyaura cross-coupling protocol using weak base and no water: The essential mole of acetate
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A weak base, CsOAc, promotes Suzuki-Miyaura cross-coupling and related Pd-catalyzed reactions under anhydrous conditions as effectively as stronger bases. Aryl triflates exhibit unusual reaction rates, which are comparable to that: of bromoarenes. A negle
- Wang, Bing,Sun, Hui-Xia,Sun, Zhi-Hua
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experimental part
p. 3688 - 3692
(2009/12/03)
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- PROCESS FOR THE PRODUCTION OF INTERMADIATES FOR THE PREPARATION OF TRICYCLIC BENZIMIDAZOLES
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The invention relates to a process for the synthesis of compounds of the formula 1-a and compounds of the formula 1-b. The compounds of the formula 1-a and the compounds of the formula 1-b, in which the substituents R1, R2, R3, and Ar have the meanings indicated in the description, are valuable intermediates for the preparation of pharmaceutically active compounds.
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Page/Page column 95
(2010/11/25)
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- Unexpected cross-coupling reaction between o-chloroaryl ketones and organomanganese reagents
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(Chemical equation presented) Alkyl- and arylmanganese reagents react with o-chloro or o-bromoaryl ketones to give the substituted ketones in high yields. The cross-coupling reaction is performed under mild conditions (-60 to +40°C, 30 min to 4 h) and tak
- Cahiez, Gerard,Luart, Denis,Lecomte, Fabien
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p. 4395 - 4398
(2007/10/03)
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- NOVEL CB 1 RECEPTOUR INVERSE AGONISTS
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The present invention relates to compounds of formula (I) wherein R1, R2, R3, R4, R5, R6, m and X are as defined in the description and claims, and pharmaceutically acceptable salts thereof. The compounds are useful for the treatment . and/or prophylaxis of diseases which are associated with the modulation of CB 1 receptors.
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- Convenient preparation of mononuclear and dinuclear ruthenium hydride complexes for catalytic application
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A mixture of commercially available [Ru(cod)(η3-C4H7)2] and PCy3 reacts with H2 to give [RuH2(H2)2(PCy3)2] in high yields, whereas [Ru
- Busch, Stefan,Leitner, Walter
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p. 2305 - 2306
(2007/10/03)
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- The stereochemistry of the vinylogous Peterson elimination
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Base-induced eliminations of the vinylogous β-hydroxysilanes 7, 9, 11 and 12 are stereospecifically syn, giving largely the trans,trans-diene 8 from 7 and 11, the cis,trans-diene 10 from 9, and the trans,cis-diene 13 from 12. When a cis double bond is produced, it is selectively placed adjacent to the carbon atom that originally carried the hydroxy group. E2′ Reactions with silyl as the electrofugal group and acetate as the nucleofugal group, initiated by fluoride ion, are not stereospecific, but can be highly stereoselective in favour of the trans,trans-diene 8 when the carbon substituent at the silicon-bearing end is a cyclohexyl group and the double bond is cis, and in favour of the trans,cis-diene 13 when the carbon substituent at the silicon-bearing end is a methyl group and the double bond is trans. Attempts to use the Peterson reactions to make o-quinodimethanes stereospecifically failed, with no evidence of 1,4-elimination from the alcohols 40 and 41. The corresponding E2′ reaction from the esters using fluoride ion on the acetates or formates 46 and 47 gave stereoselectively the E,E-quinodimethane 48.
- Fleming, Ian,Morgan, Ian T.,Sarkar, Achintya K.
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p. 2749 - 2763
(2007/10/03)
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- Ruthenium-catalysed ortho alkylation of hydroxyacetophenones; The functionalisation of ring C aromatic diterpenoids
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Reaction of 2-, 3-, or 4-hydroxyacetophenone with a catalytic amount of a ruthenium complex and excess of a vinyltrialkoxysilane results in ortho alkylation in high yield, providing that a suitable protecting group is used. Bicyclic and tricyclic analogues react similarly.
- Harris, Paul W. R.,Woodgate, Paul D.
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p. 339 - 341
(2007/10/02)
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A new ortho functionalisation of flouro- and ethylbenzene involving a 2,5- disilylation with trimethylcholorsilane in the presence of lithium in THF is reported. After aromatisation, electrophilic substitution of the TMS group in position 2, desilylation in position 5, ortho acetyl-, benzoyl-, bromo-and iodo- fluorobenzenes and ethylbenzenes are obtained in good yields.
- Bennetau, Bernard,Krempp, Michele,Dunogues, Jacques,Ratton, Serge
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p. 6179 - 6182
(2007/10/02)
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