Lanthanum trichloride: An efficient catalyst for the silylation of hydroxyl groups by activating hexamethyldisilazane (HMDS)
作者:Akkirala Venkat Narsaiah
DOI:10.1016/j.jorganchem.2007.05.002
日期:2007.8
A variety of hydroxy functional groups was protected as their corresponding trimethylsilyl ethers using HMDS in the presence of lanthanum trichloride. The catalyst LaCl3 activates the HMDS and accelerates the reaction under mild reaction conditions at room temperature to afford the corresponding silylated products in excellent yields.
Dithiophosphorylation of nerol and geraniol trimethylsilyl derivatives
作者:I. S. Nizamov、D. A. Terenzhev、I. D. Nizamov、G. G. Shumatbaev、E. S. Batyeva、R. A. Cherkasov
DOI:10.1134/s1070428017020026
日期:2017.2
Reaction of tetraphosphorus decasulfide with О-(cis- and trans-3,7-dimethylocta-2,6-dien-1-yl)-trimethylsilanes affords О,О-bis(cis- and trans-3,7-dimethylocta-2,6-dien-1-yl) S-(trimethylsilyl)dithiophosphates.
Epoxidation of allyl and homoallyl trimethylsilyl ethers with t-butyldioxytrimethylsilane and silicon lewis acid/vanadium catalyst
作者:Tamejiro Hiyama、Michio Obayashi
DOI:10.1016/s0040-4039(00)81417-3
日期:——
Trimethylsilyl ethers of allyl and homoallyl alcohols are epoxidized with t-butyldoxytrimethylsilane and a catalyst system consisting of vanadyl acetoacetate and tris(trimethylsilyl)phosphate. Stereoselectivities of the oxidation are compared with the epoxidation of allyl alcohols with t-BuOOH/V catalyst and with m-chloroperbenzoic acid.
A very efficient procedure for the trimethylsilylation of a wide variety of alcohols, including primary, allylic, benzylic, secondary, hindered secondary, tertiary, and phenols is reported. The reactions were carried out under neat conditions with trimethylsilyl azide (TMSN3) and, when necessary, in the presence of a catalytic amount (20 mol %) of tetrabutylammonium bromide (TBABr) at 30 or 70 degreesC. Under catalytic conditions, the yields of the corresponding trimethylsilyl ethers were greater than 91%. This procedure also allows the selective protection of primary and secondary alcohols in the presence of tertiary ones.
conversion of trimethylsilyl ethers to acetyl or formyl esters with TiCl<sub>4</sub>
作者:Nasser Iranpoor、Behzad Zeynizadeh
DOI:10.1080/00397919908086206
日期:1999.6
A simple method is described for the efficient conversion of trimethylsilyl ethers to their corresponding acetyl and formyl esters in refluxing ethyl acetate or ethyl formate in the presence of TiCl4.