QUATERNARY AMMONIUM SALT COMPOUND, COMPOSITION FOR FORMING A RESIST UNDER LAYER FILM, AND PATTERNING PROCESS
申请人:SHIN-ETSU CHEMICAL CO., LTD.
公开号:US20150357204A1
公开(公告)日:2015-12-10
A quaternary ammonium salt compound is represented by the following formula (A-1),
wherein, R
1
, R
2
, and R
3
each represent an alkyl group, an alkenyl group, an aryl group, or an aralkyl group, a part or all of hydrogen atoms in these groups may be substituted by a hydroxyl group(s), an alkoxy group(s), or a halogen atom(s), and these groups may include one or more of a carbonyl group and an ester bond; R
4
represents a single bond, an alkylene group, an alkenylene group, an arylene group, or an aralkylene group, a part or all of hydrogen atoms in these groups may be substituted by an alkoxy group(s) or a halogen atom(s), and these groups may include one or more of an ether bond, a carbonyl group, an ester bond, and an amide bond; and A
−
represents a non-nucleophilic counter ion.
Mixed metal MgO-ZrO2 nanoparticle-catalyzed O-tert-Boc protection of alcohols and phenols under solvent-free conditions
作者:Manoj B. Gawande、Sharad N. Shelke、Paula S. Branco、Anuj Rathi、Rajesh K. Pandey
DOI:10.1002/aoc.2846
日期:2012.8
method for O‐tert‐Boc protection of alcohols and phenols catalyzed by MgO–ZrO2 nanoparticles under solvent‐free conditions is described. A variety of phenols, alcohols (aliphatic and aromatic) were converted to corresponding O‐tert‐Boc products in good to excellent yield (50–95%). The present protocol is expedient, simple, and efficient under solvent‐free conditions. The MgO–ZrO2 Nps are easily prepared
A new simple, efficient, greener, and catalyst-free chemoselective protocol for the O-tert-butoxycarbonylation of various structurally diverse hydroxy compounds was carried out with (Boc)2O under microwave radiation. The corresponding O-tert-butoxy carbonates were obtained in good to excellent yields in a short reaction time without any side reactions.