A fast and practical synthesis of tert-butyl esters from 2-tert-butoxypyridine using boron trifluoride·diethyl etherate under mild conditions
作者:Minh Thanh La、Hee-Kwon Kim
DOI:10.1016/j.tet.2018.05.050
日期:2018.7
A practical direct preparation of tert-butyl esters from 2-tert-butoxypyridine has been developed. This system features the use of borontrifluoride·diethyl etherate in toluene solvent to rapidly achieve the reaction at room temperature. Using this reaction protocol, a variety of tert-butyl esters were synthesized from several different carboxylic acids at high yields. This practical procedure provides
Organophosphonic acids or esters containing an epoxy group
申请人:Dynamit Nobel Aktiengesellschaft
公开号:US04029679A1
公开(公告)日:1977-06-14
A method for protecting the surface of a metal surface which comprises applying to said surface an organophosphorus compound of the formula ##STR1## wherein A IS 0 OR 1 R is a branched or unbranched chained bivalent alkylene radical of 1 to 12 carbon atoms which is substituted or unsubstituted and can contain in the chain structure --O--, --S--, ##STR2## R' is a branched or unbranched alkyl radical of 1 to 12 carbon atoms which can be halogen substituted and can contain in the chain structure ##STR3## X is an epoxy ring, halogen, alkylene, carboxylic acid ester residue, amino, isocyanato, isothiocyanato, urea, thiourea, urethano, alkyl substituted thio radical or the radical or a heterocyclic ring containing O, S or N in the ring structure; a new organophosphorus compounds having the formula set forth above and more particularly defined by specific chemical structures.
Practical and Robust Method for Regio- and Stereoselective Preparation of (<i>E</i>)-Ketene <i>tert</i>-Butyl TMS Acetals and β-Ketoester-derived <i>tert</i>-Butyl (1<i>Z</i>,3<i>E</i>)-1,3-Bis(TMS)dienol Ethers
We developed an efficient, practical, robust method for the regio- and stereoselective preparation of (E)-ketene trimethylsilyl acetals (KSAs) derived from tert-butyl esters 1. The reaction was performed under convenient reaction conditions; LDA−TMSCl, 0−5 °C, and cyclopentyl methyl ether (CPME) solvent. Two kinds of (Z)- and (E)-KSAs derived from α-oxygen and α-nitrogen-substituted tert-butyl esters
USE OF VINYL ACETATE-SULFONATE COPOLYMERS AS SOLUBILIZERS FOR SLIGHTLY WATER-SOLUBABLE COMPOUNDS
申请人:Dobrawa Rainer
公开号:US20090258953A1
公开(公告)日:2009-10-15
The use of copolymers obtainable by free radical-initiated copolymerization of
a) 80 to 99.5% by weight of vinyl acetate and
b) 0.5 to 20% by weight of a monoolefinically unsaturated monomer having sulfonate groups
as solubilizers for slightly water-soluble substances.
Hydrolyzable metal-containing resin and antifouling paint composition
申请人:Nippon Paint Co., Ltd.
公开号:US05880173A1
公开(公告)日:1999-03-09
A substrate resin having pendant acid groups is produced by copolymerizing an acrylic or methacrylic ester of which alcoholic residue includes a bulky hydrocarbon radical or a soft segment. The substrate resin is then metallized together with an organic mobobasic acid so that both of the pendant acid group and the organic monobasic acid group are bount to the same metal atom. The resulting hydrolyzable metal-containing resin is incorporated into self-polishing antifouling paint formulations together with an antifouling pigment such as cuprous oxide.