Process for the preparation of lactic acid silyl esters
CA 1237136 A · Owner: Bayer Aktiengesellschaft · Inventors: Krall, Hermann D.; Gallenkamp, Bernd
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel lactic acid silyl esters of the formula (I), in which, R represents alkyl or aryl are obtained by a new process which comprises reacting a lactic acid of the formula, (II), with a chloromethylsilane of the formula (III), in which, R has the meaning indicated above in the presence of a tertiary amine and if appropriate, in, the presence of an additional diluent at temperatures between 50, and 120°C. The compounds of formula I are intermediates useful in the preparation of a class of compounds having herbicidal utility and having the formula IV, (IV) in which, R has the above-mentioned meaning R1 represents chlorine or trifluoromethyl R2 represents hydrogen or chlorine and X represents …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 24, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.