Silylation and Tetrahydropyranylation of Alcohols Catalyzed by Al(HSO<sub>4</sub>)<sub>3</sub>
作者:Farhad Shirini、Mohammad Ali Zolfigol、Masoumeh Abedini
DOI:10.1246/bcsj.78.1982
日期:2005.11
Trimethylsilylation and tetrahydropyranylation of alcohols are efficiently catalyzed by Al(HSO4)3. All reactions were performed under mild and completely heterogeneous conditions in good-to-high yields.
Generally Applicable Organocatalytic Tetrahydropyranylation of Hydroxy Functionalities with Very Low Catalyst Loading
作者:Peter Schreiner、Mike Kotke
DOI:10.1055/s-2007-965917
日期:2007.3
This paper presents the first acid-free, organocatalytic tetrahydropyran and 2-methoxypropene protection of alcohols, phenols, and other ROH derivatives utilizing privileged N,N′-bis[3,5-bis(trifluoromethyl)phenyl]thiourea and a polystyrene-bound analogue. The reactions are broadly applicably (also on preparative scale), in particular, to acid-sensitive substrates such as aldol products, hydroxy esters, acetals, silyl-protected alcohols, and cyanohydrins. The catalytic efficiency is truly remarkably with turnover numbers of 100,000 and turnover frequencies of up to 5700 h-1 at catalyst loadings down to 0.001 mol%. The computationally supported mechanistic interpretation emphasizes the hydrogen bond assisted heterolysis of the alcohol and concomitant preferential stabilization of the oxyanion hole in the transition state.
Anhydrous FePO4 as a Cost-Effective and Recyclable Catalyst for Tetrahydropyranylation and Tetrahydrofuranylation of Alcohols and Phenols
作者:Farahnaz K. Behbahani、Mona Farahani
DOI:10.2174/157017811796064485
日期:2011.7.1
In this article, a mild and efficient protocol for the tetrahydropyranylation and tetrahydrofuranylation of various aliphatic and benzylic alcohols and phenols into their corresponding THP and THF ethers (with 3,4-dihydro- 2H-pyran, DHP and 2,3-dihydrofuran, DHF) has been developed using a catalytic amount of anhydrous FePO4 at room temperature and relatively short reaction times in good to excellent yields.
Potassium dodecatangestocobaltate trihydrate (K 5 CoW 12 O 40 ·3H 2 O): a mild and efficient catalyst for the tetrahydropyranylation of alcohols and their detetrahydropyranylation
作者:Mohammad H Habibi、Shahram Tangestaninejad、Iraj Mohammadpoor-Baltork、Valiollah Mirkhani、Bahram Yadollahi
DOI:10.1016/s0040-4039(01)00298-2
日期:2001.4
A simple, mild and effective method for tetrahydropyranylation of a variety of alcohols and cleavage of their tetrahydropyranyl ethers at ambient temperature in the presence of K5CoW12O40·3H2O as the catalyst with high turnovers is described.
描述了一种简单,温和而有效的方法,该方法用于在室温下,在具有高周转率的催化剂K 5 CoW 12 O 40 ·3H 2 O的存在下,对多种醇进行四氢吡喃基化并裂解其四氢吡喃基醚。
Enzymatic production of (meth) acrylic acid esters
申请人:Haring Dietmar
公开号:US20060141593A1
公开(公告)日:2006-06-29
A method for the production of partially esterified (meth)acrylic acid esters of polyalcohols and the use thereof.