5424-75-9Relevant academic research and scientific papers
Non-corrosive heteropolyacid-based recyclable ionic liquid catalyzed direct dehydrative coupling of alcohols with alcohols or alkenes
Yang, Guo-Ping,Jiang, Nan,Huang, Xian-Qiang,Yu, Bing,Hu, Chang-Wen
, p. 80 - 85 (2019/02/27)
A non-corrosive, recyclable and efficient heterogeneous catalyst based on Keggin-type polyoxometalate, i.e., [NMPH]H3[SiW12O40] was developed for the direct dehydrative coupling of alcohols with alcohols (or alkenes) to synthesize various polysubstituted olefins in good to excellent yields. Furthermore, this reaction could be scaled up and the catalyst could be used for seven runs without significant loss of activity. The kinetic competition experiment shows that the C–H bond cleavage might be involved in the rate-determining step.
Synthesis of internal olefins by direct coupling of alcohols and olefins over MoΒ zeolite
Chevella, Durgaiah,Macharla, Arun Kumar,Kodumuri, Srujana,Banothu, Rammurthy,Gajula, Krishna Sai,Amrutham, Vasu,Grigor'eva, Nellya Gennadievna,Nama, Narender
, p. 114 - 118 (2019/07/02)
An efficient and novel Moβ zeolite catalyzed sp2-sp3 C–C bond development reaction over the direct coupling of alcohols and alkenes has been performed in solvent free environment. The current method gives an attractive access to a wide variety of polysubstituted alkenes in good to excellent yields. The Moβ zeolite was effectively reused for up to 5 successive cycles.
CaII-Catalyzed Alkenylation of Alcohols with Vinylboronic Acids
Leb?uf, David,Presset, Marc,Michelet, Bastien,Bour, Christophe,Bezzenine-Lafollée, Sophie,Gandon, Vincent
supporting information, p. 11001 - 11005 (2015/11/10)
Direct alkenylation of a variety of alcohols with vinylboronic acids has been accomplished using the air-stable calcium(II) complex Ca(NTf2)2 under mild conditions with short reaction times. For reluctant transformations, an ammonium salt was used as an additive to circumvent the reactivity issue. Cross-coupling: Direct alkenylation of a variety of alcohols with vinylboronic acids has been accomplished using the air-stable calcium(II) complex Ca(NTf2)2 under mild conditions with short reaction times (see scheme)
Silica-supported policresulen as a solid acid catalyst for organic reactions
Zeng, Kexing,Huang, Zhipeng,Yang, Jie,Gu, Yanlong
, p. 1606 - 1613 (2015/09/15)
A new type of solid catalyst was prepared by coating a thin layer of policresulen, an inexpensive polymer prepared via condensation of 2-hydroxy-4-methylbenzenesulfonic acid and formaldehyde that has been used as commercially available drug, onto the surface of silica. The policresulen component is insoluble in many organic solvents and can be adsorbed on silica with the aid of hydrogen bonding. The obtained silica/policresulen composite showed remarkable catalytic activity for various organic reactions. In model reactions, the catalyst can be recycled several times without significant loss of activity. The salient features of using this acid catalyst in organic reactions include cost-effectiveness, simple and time-efficient preparation, and the convenience of controlling the acid loading on the solid.
Greener approach for the synthesis of substituted alkenes by direct coupling of alcohols with styrenes using recyclable Bronsted acidic [NMP] +HSO4- ionic liquid
Wagh, Kishor V.,Bhanage, Bhalchandra M.
, p. 22763 - 22767 (2014/06/23)
A novel protocol for the synthesis of substituted alkenes from alcohols and styrenes using ionic liquid has been developed. The ionic liquid N-methyl-2-pyrrolidone hydrogen sulfate [NMP]+HSO4 - acts as a catalyst as well as solvent. The developed protocol has higher atom efficiency and wider substrate applicability. The catalyst was effectively recycled for up to five consecutive cycles. This journal is the Partner Organisations 2014.
A novel efficient method for the synthesis of substituted olefins; Cross coupling of two different alcohols using NaHSO4/SiO2
Aoyama, Tadashi,Koda, Shuichi,Takeyoshi, Yuka,Ito, Tetsuhiro,Takido, Toshio,Kodomari, Mitsuo
, p. 6605 - 6607 (2013/07/26)
Simple and efficient cross coupling of alcohols was developed in the presence of NaHSO4/SiO2 to give the corresponding substituted olefins. Direct coupling of alcohols and alkenes was also achieved to give substituted olefins. NaHSO4/SiO2 could be recycled 7 times without loss of catalytic activity.
DDQ-catalyzed oxidative C-O coupling of sp3 C-H bonds with carboxylic acids
Yi, Hong,Liu, Qiang,Liu, Jie,Zeng, Ziqi,Yang, Yuhong,Lei, Aiwen
, p. 2143 - 2146 (2013/01/15)
Da-ddy, DDQ: By using catalytic amounts of DDQ combined with MnO 2 as oxidant, an efficient oxidative C-O coupling of benzylic sp 3 C-H bonds with carboxylic acids affords a series of carboxylic esters in 70-98 % yields. A wide range
Zinc-Promoted Reactions. 1. Mechanism of the Clemmensen Reaction. Reduction of Benzophenone in Glacial Acetic Acid
Vona, Maria Luisa Di,Rosnati, Vittorio
, p. 4269 - 4273 (2007/10/02)
The mechanism of the Clemmensen reduction of diaryl ketones was investigated by reducing benzophenone, benzhydryl chloride, and dichlorodiphenylmethane in AcOH under a variety of conditions.Besides diphenylmethane, dimeric products were isolated that were indicative of the formation of radical species.Different product distributions were obtained from reactions run under different conditions.The reduction of deuteriated benzhydryl chloride was also performed.A quite complicated mechanistic pattern, involving ionic and nonionic reactions, emerged from the experimental p icture.Two pathways, connected through the protonated substrate, were recognized.According to the first pathway the reduction is promoted by a SET from Zn to the substrate, leading to the formation of a carbon radical having one zinc atom bound to the oxygen of the carbonyl group.Benzhydryl chloride, benzhydryl acetate, and dichlorodiphenylmethane are involved in the process.The product distributions suggest the occurrence of several SETs, which involve the formation of different radical species.Ionic reactions are responsible for the second route to the reduced products.Nucleophilic displacements also participate to the complex mechanism.
