Verfahren zur Herstellung von alpha-Cyano Essigsäureestern
申请人:BASF AKTIENGESELLSCHAFT
公开号:EP0999206A1
公开(公告)日:2000-05-10
Herstellung von Cyanessigsäureestern durch Umsetzung eines entsprechenden Monochloressigsäureesters mit Cyanwasserstoff in Gegenwart einer Base, wobei es sich bei der Base um eine Verbindung, ausgewählt aus der Gruppe der tertiären Amine, Salze der Kohlensäure, Salze der Kohlensäurehalbester, Salze von Carbonsäuren, Amidine, Guanidine und aromatischen N-Heterocyclen handelt.
[EN] IONIC LIQUIDS BASED ON OXALIC ACID MONO ESTERS<br/>[FR] LIQUIDES IONIQUES À BASE DE MONOESTERS DE L'ACIDE OXALIQUE
申请人:BASF SE
公开号:WO2014056844A1
公开(公告)日:2014-04-17
Monosubstituted oxalic acid derivatives of the general formula (I) [A]+[O-C(O)-C(O)-O-X]-, wherein the meaning is: for [A]+, a cation made from an organic moiety A having a formally positively charged heteroatom selected from the group consisting of nitrogen, phosphorus and sulfur, X is a C1 to C30 organic residue, and wherein the following compounds (I) are disclaimed:tetramethylammonium monomethyloxalate methyltri(alkyl)ammonium monomethyloxalate trimethyl(1-hydroxyethyl)ammonium monomethyloxalate methyltriethylammonium monomethyloxalate tetraethylammonium monomethyloxalate n-propyltriethylammonium mono-n-propyloxalate n-butyltriethylammonium mono-n-butyloxalate benzyltriethylammonium monobenzyloxalate cyclohexyldimethylammonium monomethyloxalate dimethyl-phenylammonium monomethyloxalate. Tetrabutylammonium monomethyloxalate N-methylpyridinium monomethyloxalate N-ethylpyridinium monoethyloxalate N-n-propylpyridinium mono-n-propyloxalate N-n-butylpyridinium mono-n-butyl-oxalate N-benzylpyridinium monobenzyloxalate N-methyl-isochinolinium monomethyloxalate N-ethyl-isochinolinium monoethyloxalate N-n-propyl-isochinoliniummono-n-propyloxalate N-n-butyl-isochinolinium mono-n-butyloxalate N-benzyl-isochinolinium monobenzyloxalate.
Several pentaalkylguanidines have been prepared and found to be superior catalysts for the preparation of aryl and aralkylethers from carbonates and for the methylation of phenols with dimethylcarbonate. They also act as effective catalysts for esterification of acids with alkyl chloroformates but not for the acetylation of tertiary alcohols with acetic anhydride.