1117-31-3Relevant articles and documents
Synthesis, structure and reactivity of hydrated and dehydrated organotin cations
Chandrasekhar, Vadapalli,Boomishankar, Ramamoorthy,Gopal, Kandasamy,Sasikumar, Palani,Singh, Puja,Steiner, Alexander,Zacchini, Stefano
, p. 4129 - 4136 (2006)
Monomeric organotin dications {[nBu2Sn(H2O) 4]2+· 2C6H5SO 3-} and {[nBu2Sn(H2O) 4]2+·1,5-C10H6(SO 3-)2} have been synthesized by the reaction of [nBu2SnO]n and the corresponding arylsulfonic acid. Dodecanuclear organooxotin macrocations {[(nBuSn)12(μ3- O)14(μ2-OH)6]2+·2RSO 3-} (R = C6H5; 2,5-Me 2C6H3) have been synthesized by the reaction of nBuSn(O)(OH) and the corresponding arylsulfonic acid. The X-ray crystal structure of one of the dodecanuclear cages is reported. These organotin cations have been shown to be effective catalysts in acetylation and transacetylation reactions. Wiley-VCH Verlag GmbH & Co. KGaA, 2006.
A novel synthesis of 1,3-diol diesters by the reaction of aldehydes with oxime esters catalyzed by samarium complex
Kawasaki, Yumi,Tashiro, Daisuke,Sakaguchi, Satoshi,Ishii, Yasutaka
, p. 53 - 54 (1998)
Cp*2Sm(thf)2 was found to be an efficient catalyst for the synthesis of 1,3-diol diesters by the coupling reaction of aldehydes with oxime esters under mild conditions. For instance, the reaction of acetaldehyde with cyclohexanone oxime acetate catalyzed by Cp*2Sm(thf)2 gave 1,3-diacetoxybutane in 70% yield. Treatment of acetaldehyde with isopropenyl acetate in the presence of a small amount of cyclohexanone oxime acetate and Cp*2Sm(thf)2 resulted in the corresponding 1,3-diol diester in good yield.
Sulfonic acid-functionalized periodic mesoporous organosilicas in esterification and selective acylation reactions
Karimi, Babak,Mirzaei, Hamid M.,Mobaraki, Akbar,Vali, Hojatollah
, p. 3624 - 3631 (2015/07/01)
The application of sulfonic acid-functionalized periodic mesoporous organosilicas (PMOs) having either phenyl (1a) or ethyl (1b) bridging groups was investigated in the esterification of a variety of alcohols and fatty acids. It was found that 1b consistently exhibited higher catalytic performance than 1a in the described reaction. In particular, it was proposed that the superior catalytic activity of 1b in esterification of fatty acids with methanol is a result of adequate hydrophobic-hydrophilic surface balance in the ethyl PMO catalyst. In addition, the study of chemoselective acylation of 1,3-butanediol with dodecanoic acid with varied mesoporous silica-supported solid sulfonic acids including both 1a and 1b implies that there is a compromise between the reaction selectivity and the surface physicochemical properties of the employed catalyst. Our results clearly show that the catalyst having high surface hydrophilic nature gives high selectivity toward the formation of mono-acylated products whereas those with relatively high hydrophobic characteristics showed enhanced selectivity toward the formation of di-acylated products.
A highly selective, high-speed, and hydrolysis-free O-acylation in subcritical water in the absence of a catalyst
Sato, Masahiro,Matsushima, Keiichiro,Kawanami, Hajime,Ikuhsima, Yutaka
, p. 6284 - 6288 (2008/04/05)
(Chemical Equation Presented) Fast and furious: A wide range of alcohols are acylated by acetic anhydride, in the absence of catalyst, in subcritical water in a flow-type microreaction system. The esters are selectively produced in high yields at temperatures of 200 to 250°C. Varying the amount of acetic anhydride added with respect to the alcohols allows the regioselective acylation of one or both hydroxy groups of various dihydroxy compounds (see picture).