New Methodology for the Conversion of Epoxides to Alkenes
作者:Feng-Ling Wu、Benjamin P. Ross、Ross P. McGeary
DOI:10.1002/ejoc.200901264
日期:2010.4
Epoxides have been transformed in good yields to alkenes by a process involving (i) ring-opening of the epoxide with 2-mercaptobenzothiazole, (ii) oxidation of the derived s-hydroxy thioethers to the corresponding sulfones, and (iii) thermal or base-promoted fragmentation of these sulfones to alkenes. The stereochemistry of the starting epoxide is transfer-red faithfully to the alkene product, because
Electro-conductive paste with characteristic weight loss for low temperature application
申请人:Heraeus Deutschland GmbH & Co. KG
公开号:EP2966124A1
公开(公告)日:2016-01-13
In general, the invention relates to electro-conductive pastes with characteristic weight loss and their use in the preparation of photovoltaic solar cells. More specifically, the invention relates to electro-conductive pastes, solar cell precursors, processes for preparation of solar cells, solar cells and solar modules.
1. The invention relates to paste comprising the following paste constituents:
a. Metal particles;
b. A polymer system;
wherein the first weight loss Δ30, determined according to the test method provided herein, is in the range from about 0.02 to about 0.5.
Catalyst compositions for selective dimerization of ethylene
申请人:SAUDI BASIC INDUSTRIES CORPORATION
公开号:US10105693B2
公开(公告)日:2018-10-23
A catalyst composition, including a titanate of the formula Ti(OR)4 wherein each R is the same or different, and is a hydrocarbon residue; a catalyst additive, wherein the catalyst additive is a dibutyl ether a silicate, a silazane, an aromatic ether, a fluorocarbon, or a combination comprising at least one of the foregoing; and an organic aluminum compound.
一种催化剂组合物,包括式 Ti(OR)4 的钛酸酯,其中各 R 相同或不同,且为烃残基;一种催化剂添加剂,其中催化剂添加剂为二丁醚、硅酸盐、硅烷、芳香族醚、碳氟化合物或至少包含上述一种的组合;以及一种有机铝化合物。
Stable and high solids aqueous dispersions of blocked polyisocyanates
申请人:DEGUSSA-HUELS AKTIENGESELLSCHAFT
公开号:US20020025996A1
公开(公告)日:2002-02-28
A stable and high-solids aqueous dispersion of blocked isocyanates, containing auxiliary solvent, is prepared by (1) preparing a solution of a polyisocyanate mixture of from 20-70% by weight of a blocked, hydrophilically modified polyisocyanate (A) and from 30-80% by weight of a blocked, hydrophobic polyisocyanate (B) in an auxiliary solvent (G) and (2) adding water to this solution, with intensive mixing, in an amount which is such as to give a two-phase system comprising a disperse polyisocyanate phase and a continuous, aqueous phase containing auxiliary solvent. In a preferred embodiment of the invention dispersions are prepared which are virtually free from auxiliary solvent, by first adding a portion of water to the solution (1), substantially removing the auxiliary solvent with intensive mixing and then adding a second portion of water with intensive mixing to the mixture comprising the polyisocyanates (A) and (B) and the first portion of water.