作者:Timothy J. Donohoe、Peter R. Moore、Michael J. Waring、Nicholas J. Newcombe
DOI:10.1016/s0040-4039(97)01061-7
日期:1997.7
The preparation and dihydroxylation of a series of polyenes and cyclicallylicalcohols using the TMEDA/osmium tetroxide mixture is reported. Remarkably, these reagents lead to high levels of regiochemical and stereochemical control as the oxidant hydrogen-bonds to the allylicalcohol group. A mechanistic hypothesis is presented which invokes the formation of a reactive, bidentate complex between osmium
Reaction of butyllithium with benzylidene acetals of aldopyranosides and 1,5-anhydroalditols
作者:Derek Horton、Wolfgang Weckerle
DOI:10.1016/0008-6215(88)85099-7
日期:1988.3
butyllithium selectively cleaves 5-membered benzylidene acetals (1,3-dioxolane ring) leaving the 6-membered analogs (1,3-dioxane ring) intact in aldopyranoside and 1,5-anhydroalditol derivatives. The usual course of the reaction involves expulsion of the elements of benzaldehyde to give an enolate anion and thence a vicinal deoxyketone. The reaction is strongly regioselective and may be interpreted as proceeding
Method of preparation of heterocyclic molecules with pharmaceutical, pharmaceutical excipient, cosmeceutical, agrochemical and industrial uses
申请人:Hong Borcherng
公开号:US20060173199A1
公开(公告)日:2006-08-03
Processes for preparing racemic and optically pure 3,6-dihydro-2H-pyrans of formulae H, I, N and O are described. These compounds may be further transformed into compounds of formulae J, K, L, M, P, Q, S, T, U, V, Y and Z with potential pharmaceutical, pharmaceutical excipient, cosmeceutical, agrochemical and industrial applications.
Phenol-Free Overbased Alkaline Earth Metal Carboxylate
申请人:Ferro Corporation
公开号:US20160017118A1
公开(公告)日:2016-01-21
A phenol-free overbased alkaline earth metal carboxylate is obtained by reacting a cyclic ether alcohol, an alkaline earth metal hydroxide, a fatty carboxylic acid, carbon dioxide, an optional fatty alcohol, and an optional liquid hydrocarbon solvent or oil.