2408-37-9Relevant articles and documents
Synthesis method of beta-damascenone
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Paragraph 0054-0059, (2020/08/02)
The invention provides a synthesis method of beta-damascenone. The synthesis method comprises the following steps: 1) carrying out nucleophilic addition reaction on a compound II and acetylene to generate a compound III; (2) carrying out condensation reaction on the compound III and acetaldehyde to generate a compound IV, and (3) carrying out Meyer-Schureter rearrangement reaction on the compoundIV to obtain a compound V, namely the beta-damascenone.
An unexpected generation of magnetically separable Se/Fe3O4 for catalytic degradation of polyene contaminants with molecular oxygen
Chen, Xingyu,Mao, Jingfei,Liu, Chuang,Chen, Chao,Cao, Hongen,Yu, Lei
supporting information, p. 3205 - 3208 (2020/08/12)
Selenization of Fe2O3 with NaHSe led to Se/Fe3O4. The unexpected generation of Fe3O4 attributed to the reduction conditions of the reaction, and the resulted magnetic features of the materi
Diastereoselective Synthesis of (±)-Epianastrephin, (±)-Anastrephin and Analogs Thereof
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Paragraph 0090; 0091, (2017/11/14)
A process for the synthesis of trans-fused γ-lactones having Formula (IV) from substituted cyclic ketones having Formula (I). A diastereoselective synthesis of (±)-epianastrephin (1) (wherein: R1 is ethenyl, R2 and R3 is methyl, and n is 1), (±)-anastrephin (2) (wherein: R2 is ethenyl, R1 and R3 is methyl and n is 1), and analogs thereof (wherein: R1 is H, C1-5 alkyl, C2-6 alkenyl or C2-6 alkynyl, R2 is H, C1-5 alkyl, C2-6 alkenyl or C2-6 alkynyl, R1 and R2 together with the carbon atom they are attached form a C3-6 cycloalkyl ring, R3 is C1-5 alkyl and n is 0-2):
New application of cross-linked poly(N -bromoacrylamide) and poly(N -bromosuccinimide) as highly efficient and chemoselective heterogeneous polymeric catalysts for deprotection of 1,3-dithianes and 1,3-dithiolanes under mild conditions
Ebrahimzadeh, Farzaneh
, p. 89 - 104 (2016/02/18)
Cross-linked poly(N-bromoacrylamide) (PNBA) and poly(N- bromosuccinimide) as the mild and efficient heterogeneous polymeric catalysts were applied for selective deprotection of 1,3-dithianes and 1,3-dithiolanes to their corresponding carbonyl compounds. They were also effective as a reagent in aqueous media. These methods are very simple and the polymer catalysts could be recycled several times. Deprotection of thioacetal and thioketal without enolizable hydrogens proceeded very well to give only the corresponding aldehyde and ketone in high to excellent yield. Nevertheless, in the case of thioketals carrying enolizable hydrogens, deprotection accompanied with the formation of a minor ring-expanded product is observed. However, using the PNBA/H2O system, ring expansion of these thiolketals with enolizable hydrogen was not detected. These methods provide advantages, such as chemoselectivity, easy preparation, simple work up, excellent yields, and the ability to recycle the catalyst, which makes this method more useful compared to other known methodologies.
Photocatalytic degradation of water taste and odour compounds in the presence of polyoxometalates and TiO2: Intermediates and degradation pathways
Fotiou, Theodora,Triantis, Theodoros M.,Kaloudis, Triantafyllos,Papaconstantinou, Elias,Hiskia, Anastasia
, p. 1 - 9 (2014/05/20)
Geosmin (GSM) and 2-methylisoborneol (MIB) are produced by several species of cyanobacteria and actinomycetes. These compounds can taint water and fish causing undesirable taste and odours. Studies have shown that GSM/MIB are resistant in standard water treatments. Polyoxometalates (POM) are efficient photocatalysts in the degradation and mineralization of a great variety of organic pollutants, presenting similar behaviour with the widely published titanium dioxide (TiO2). Photocatalytic degradation of GSM and MIB under UV-A light in the presence of a characteristic POM photocatalyst, SiW 12O404-, in aqueous solution has been studied and compared with the photodegradation by TiO2 suspensions. GSM and MIB are effectively degraded in the presence of both photocatalysts. Addition of OH radical scavengers (KBr and tertiary butyl alcohol, TBA) retards the photodegradation rates of both compounds, suggesting that photodegradation mechanism takes place via OH radicals. Intermediates identified using GC-MS in the case of GSM and MIB, are mainly identical in the presence of both photocatalysts, also suggesting a common reaction mechanism. Possible photocatalytic degradation pathway for both GSM and MIB is proposed.
Synthesis of five-and six-membered 1,3,3-trimethyl-2-(trimethylsilyl) cycloalkenes: A novel preparation of alkyl/alkenyl/aryl 2,5,5-trimethyl-1- cyclopentenyl ketones
Venkatesha, Manjunatha A.,Suresh, Hariprasad
, p. 759-768+S57-S61 (2013/07/26)
1,3,3-trimethyl-2-(trimethylsilyl)cyclopentene and 1,3,3-trimethyl-2- -(trimethylsilyl)cyclohexene were prepared in good yields by the Wurtz-Fittig coupling reaction of the corresponding 2-iodo-1,3,3-trimethylcyclopentene and 2-chloro-1,3,3-trimethylcyclohexene with metallic sodium and chlorotrimethylsilane in anhydrous ether solvent. The Friedel-Crafts acylation reaction of 1,3,3-trimethyl-2-(trimethylsilyl)cyclopentene with six different acid chlorides and the novel preparation of six alkyl/alkenyl/aryl 2,5,5-trimethyl-1-cyclopentenyl ketones are reported.
Cabinet for locking a distributor and method
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, (2007/12/05)
A device for dispensing items comprises a cabinet having an interior for storing items. A dispenser frame is coupled to the cabinet and is configured to be accessed, such as by pulling the dispenser frame from the cabinet. The dispenser frame includes a plurality of dividers that are configured to hold the plurality of dispensing mechanisms that each hold multiple items within the storage area. Further, the dividers are reconfigurable to permit the arrangement of the dispensing mechanisms to be adjusted. A lockable door is coupled to the front of the cabinet in front of the dispenser frame. The door may be opened to provide access to the interior of the cabinet and to the dispenser frame. A dispense drawer is positioned below the storage area so that items dispensed from the dispensing mechanisms.
Total synthesis of (±)-dihydroactinidiolide using selenium-stabilized carbenium ion
Dabdoub, Miguel J.,Silveira, Claudio C.,Lenard?o, Eder J.,Guerrero Jr., Palimécio G.,Viana, Luiz H.,Kawasoko, Cristiane Y.,Baroni, Adriano C.M.
scheme or table, p. 5569 - 5571 (2011/02/24)
A new, short total synthesis of dihydroactinidiolide 1 is described using selenium carbenium ion-promoted carbon-carbon bond formation as the key step. Our synthetic strategy starts with a lactonization reaction between 1,3,3-trimethylcyclohexene 13 and α-chloro-α-phenylseleno ethyl acetate 14, affording the key intermediate, α-phenylseleno-γ-butyro lactone 15, which reacted via a selenoxide elimination to the target compound 1.
The catalytic enantioselective, protecting group-free total synthesis of (+)-dichroanone
McFadden, Ryan M.,Stoltz, Brian M.
, p. 7738 - 7739 (2007/10/03)
Herein we report the first enantioselective total synthesis of (+)-dichroanone, confirming the absolute configuration of the natural product. This protecting group-free route features the first application of our enantioselective Tsuji allylation in the context of a natural product total synthesis. Additionally, this 11-step preparation of the molecule from commercial material features a novel Kumada-aromatization strategy and a rapid sequence for the conversion of a phenol to a hydroxy-p-benzoquinone. Copyright
Total synthesis of (±)-hedychenone: Trimethyldecalin terpene systems via stepwise allenoate diene cycloaddition
Jung, Michael E.,Murakami, Masayuki
, p. 5857 - 5859 (2007/10/03)
(Diagram presented) The total synthesis of hedychenone 1 is described. The cycloaddition of the hindered diene 2 and the allenecarboxylate 3 has been shown conclusively to proceed via the [2+2] cycloadduct 5 to give a 2:1 mixture of the desired formal Diels-Alder adducts, the exo and endo isomers 4xn and is thus a stepwise [4+2] cycloaddition. The exo isomer 4x was converted in four steps (reduction, oxidation, olefination, and desilylation) into hedychenone 1.