Improved sucrose-6-ester process

Details Improved sucrose-6-ester process Improved sucrose-6-ester process

C - Chemistry, Metallurgy

07

H

C07H 13/02 (2006.01) C07H 13/04 (2006.01) C07H 13/06 (2006.01) C07H 13/08 (2006.01)

Patent

CA 2191412

There is described a process which comprises passing vapors of a solvent capable of removing water by codistillation through a reaction mixture containing (a) a polar aprotic solvent and (b) sucrose and a 1,3-diacyloxy-1,1,3, 3-tetra-(hydrocarbyl)distannoxane and/or the reaction product of sucrose and a 1,3-diacyloxy-1,1,3,3-tetra(hydrocarbyl)distannoxane, in sufficient quantity and for a period of time sufficient to remove substantially all of the water in said reaction mixture by codistillation. In a particular aspect, there is described a process which comprises: (1) preparing a first reaction mixture comprising sucrose and a polar aprotic solvent, and optionally heating said first reaction mixture by passing vapors of a second solvent capable of removing water by codistillation through said first reaction mixture; (2) adding a 1,3-diacyloxy-1,1,3,3-tetra(hydrocarbyl)-distannoxane to said first reaction mixture to form a second reaction mixture; (3) passing vapors of a second solvent capable of removing water by codistillation through said second reaction mixture, in sufficient quantity and for a period of time sufficient to remove substantially all of the water in said reaction mixture by codistillation, to form thereby a third reaction mixture comprising said polar aprotic solvent and said second solvent, said second reaction mixture being substantially free of water, and; (4) adding a carboxylic acid anhydride to said third reaction mixture to form a fourth reaction mixture and maintaining said fourth reaction mixture at a temperature and for a period of time sufficient to produce a sucrose-6-ester.

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