Hafnium-catalyzed transesterification

Details Hafnium-catalyzed transesterification Hafnium-catalyzed transesterification

1990-03-12

1991-08-06

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

546248, 548235, 548341, 548342, 558444, 560217, C07D26530, C07D29518, C07D21130, C07C 6703

Patent

active

050379780

ABSTRACT:
An ester of a carboxylic acid is prepared via a transesterification reaction which comprises reacting a lower alkyl ester of carboxylic acid with a higher alkyl alcohol in the presence of a catalyst consisting of a hafnium chelate derived from hafnium tetrachloride, bis(alkoxide)hafnium dichlorides, or hafnium tetraalkoxides in the presence of 1,3-dicarbonyl compounds.

REFERENCES:
patent: 4202990 (1980-05-01), Murakami et al.
patent: 4594439 (1986-06-01), Katsuki et al.
patent: 4609745 (1986-09-01), Dieter et al.
patent: 4609755 (1986-09-01), Farrar
patent: 4777265 (1988-10-01), Franz et al.

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