C - Chemistry – Metallurgy – 07 – H
Patent
C - Chemistry, Metallurgy
07
H
260/233.1
C07H 3/00 (2006.01) C07H 5/02 (2006.01) C07H 11/00 (2006.01) C07H 13/04 (2006.01)
Patent
CA 1316532
ABSTRACT Sugars and partly protected sugar derivatives are chlorinated by reaction of unprotected hydroxyl groups with thionyl chloride to form a persulphite followed by decomposition of the sulphite groups to form chlorosulphites, displacement of the chlorosulphite groups and insertion of chlorine atoms at one of more positions, characterised in that formation and displacement of the chlorosulphite groups and insertion of chlorine atoms is effected by reaction with thionyl chloride in an inert solvent in the presence of a quarternary salt of the general formula: N+R1R2R3R4 Cl- (I) wherein R1, R2 and R3, which may be the same or different, each represent a lower alkyl group, and R4 represents a hydrocarbon group with at least seven carbon atoms; and, when the sugar or partly protected sugar derivative has more than three unprotected hydroxyl groups, the process comprises the following stages: (a) reaction of the sugar or partly protected sugar derivative with thionyl chloride in the presence of pyridine to form a persulphite; (b) solution of the polysulphite to remove free pyridine; and (c) reaction of the isolated polysulphite with thionyl chloride in an inert solvent of suspension medium in the presence of a quaternary salt of the general formula (I).
607337
Homer Nigel John
Jackson Graham
Sankey George Henry
Simpson Philip John
Marks & Clerk
Tate & Lyle Public Limited Company
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