Process for silylizing carbohydrates, and use of the silylized carbohydrates

US5410037A · kind A · utility

Assignee

• Rhone-Poulenc Rhodia Aktinegesellschaft · DE

Inventors

• Thomas Wagner · Konstanz, DE
• Werner Mormann · Zürich, CH

Key dates

• Filing date: Mar 18, 1994
• Grant date: Apr 25, 1995
• Expiry date: Mar 18, 2014

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08B31/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

There is described a process for silylizing carbohydrates in liquid nitrogen compounds, PA0 the carbohydrates being reacted under pressure in an autoclave at a tempperature of about 0.degree. to 200.degree. C. with a silylizing agent of the formula (I) ##STR1## in a liquid nitrogen compound of the formula (II) ##STR2## the respective radicals in the two formulas (I) and (II) being, independently of each other: PA0 hydrogen, a low alkyl group with 1 to 4 carbon atoms, a cycloalkyl group with 3 to 6 carbon atoms, an aryl group in the form of a phenyl or naphthyl radical, an aralkyl group with 7 to 18 carbon atoms, an alkylaryl group with 7 to 18 carbon atoms, or an O-, S- or N-containing heterocyclic group with 2 to 5 carbon atoms. An especially suitable silylizing agent is hexamethyl disilazane. As liquid nitrogen compound preferably ammonia is taken, which under the process conditions is liquid. The process according to the invention is of advantage ecologically and economically. The products obtained according to the invention are especially pure, making further processing possible.