Title:
SILICA CARRIER GRAFTED WITH POLYALKYLGUANIDINIUM GROUP, ITS PRODUCTION AND IT USE AS CATALYST
Document Type and Number:
Japanese Patent JP3406625
Kind Code:
B2
Abstract:
PURPOSE: To obtain a catalyst which can convert carboxylic acids into the corresponding acid chlorides or esters by grafting through covalent bonds with polysubstd. guanidinium groups, preferably polyalkylguanidinium groups on the surface of a silica catalyst.
CONSTITUTION: The carrier essentially comprising silica is a porous one for easy filtration and consists of small spheres having 0.01 to 1 mm diameter, 50 to 750 m2/g specific surface area and about 4.8 to 10 mol/m2 density of silanol functional groups on the surface. The silica is reacted with polyalkylguanidinium ions to obtain a catalyst expressed by formula I. The obtd. catalyst is useful for esterification of acids having hindered groups. In formula I, R is a carrier essentially comprising silica; Y is a branched or straight-chain 2-10C bivalent alkyl; Z is a 2-10C bivalent aliphatic group; R' is a 1-4C alkyl; R1 to R7 are each 1-6C alkyl; A is a univalent anion; n is 0 or an integer; T is a bond with the carrier, -Si(R0)3' or 1-4C alkyl; R0 is a 1-4C alkyl.
Inventors:
Patricia Gaultier
Philip Guro
Pierre le Purche
Jean-Pierre Seine
Philip Guro
Pierre le Purche
Jean-Pierre Seine
Application Number:
JP31870592A
Publication Date:
May 12, 2003
Filing Date:
November 27, 1992
Export Citation:
Assignee:
SNP
International Classes:
B01J31/26; B01J31/02; C01B33/12; C07C51/363; C07C51/60; C07C67/00; C07C67/10; C07C69/24; C07C69/75; C07C69/76; C08G73/02; C09C1/28; C09C1/30; C09C3/08; C09C3/10; B01J21/08; B01J37/02; (IPC1-7): B01J31/26; C01B33/12; C07C51/60; C07C67/10; C07C69/24; C07C69/75; C07C69/76; C09C1/30; C09C3/08; C09C3/10
Domestic Patent References:
| JP6164335A | ||||
| JP616116A | ||||
| JP6222730A | ||||
| JP5679636A |
Attorney, Agent or Firm:
Aoki Akira (4 outside)