tetramethylammonium methyl carbonate is effective as a catalyst for the chemoselective, scalable, and reusable transesterification of various esters and alcohols in common organic solvents. In situ-generated highly active species, tetramethylammonium alkoxides, can greatly avoid self-decomposition at ≤110 °C, and are reusable. In particular, chelating substrates, such as amino alcohols, diols, triols,
MOLECULAR GLASS PHOTORESISTS CONTAINING BISPHENOL A FRAMEWORK AND METHOD FOR PREPARING THE SAME AND USE THEREOF
申请人:Yang Guoqiang
公开号:US20150037735A1
公开(公告)日:2015-02-05
The present invention provides a class of molecular glass photoresist (I and II) comprising bisphenol A as a main structure and their preparation. The molecular glass photoresist is formulated with a photoacid generator, a cross-linking agent, a photoresist solvent, and other additives into a positive or negative photoresist. A photoresist with a uniform thickness is formed on a silicon wafer by spin-coating. The photoresist formulation can be used in modern lithography, such as 248 nm photolithography, 193 nm photolithography, extreme-ultraviolet (EUV) lithography, nanoimprint lithography, electron beam lithography, and particularly in the EUV-lithography technique.
A comparison of decomposition and solvolysis reactions of 1-adamantyl chloroglyoxylate and 1-adamantyl chloroformate
作者:D. N. Kevill、F. L. Weitl
DOI:10.1039/p19720002162
日期:——
Decomposition of 1-adamantyl chloroglyoxylate (I) in nitrobenzene at 105° is about 40,000 times slower than the analogous decomposition of 1-adamantylchloroformate (II). In benzene at 105°, the ester (I) forms appreciable amounts of 1-phenyladamantane. Unlike the heterolytic reactions of ester (II), decomposition reactions of ester (I) may well be homolytic in nature. In contrast to the fragmentation