Title:
【発明の名称】糖類の塩素化方法
Document Type and Number:
Japanese Patent JP3055910
Kind Code:
B2
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 or 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 quaternary salt of the general formula: N<+>R<1>R<2>R<3>R<4> Cl<-> (I) wherein R<1>, R<2> and R<3>, which may be the same or different, each represent a lower alkyl group, and R<4> 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) isolation of the polysulphite to remove free pyridine; and (c) reaction of the isolated polysulphite with thionyl chloride in an inert solvent or suspension medium in the presence of a quaternary salt of the general formula (I). o
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Inventors:
Nigel John Homer
Graham Jackson
George Henry Sankey
Philip John Simpson
Graham Jackson
George Henry Sankey
Philip John Simpson
Application Number:
JP20224789A
Publication Date:
June 26, 2000
Filing Date:
August 03, 1989
Export Citation:
Assignee:
Tate and Lyle Public Limited Company
International Classes:
C07B61/00; C07H5/02; C07H11/00; C07H13/04; (IPC1-7): C07H5/02
Domestic Patent References:
| JP62135487A |
Other References:
【文献】米国特許4605784(US,A)
Attorney, Agent or Firm:
Akira Asamura (1 person outside)