Preparation of 1-alkyl-3,5-diphenylpyrazoles
CA 1238641 A · Owner: American Cyanamid Company · Inventors: Maulding, Donald R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
29,293, PREPARATION OF 1-ALKYL-3,5-DIPHENYLPYRAZOLES ABSTRACT OF THE DISCLOSURE, The invention relates to a process for the preparation of substituted and unsubstituted 1-alkyl- 3,5-diphenylpyrazole compounds by reacting a 3,5-diphenyl (substituted or unsubstituted) pyrazole with an excess of dialkyl sulfate, in the presence of aqueous alkali hydroxide. A typical compound contemplated herein has the basic structure, in which each of the phenyl rings can carry up to two substituents, and R1 is a lower alkyl group. These compounds find use in synthesizing herbicides.
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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 June 28, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 2005.
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Timeline
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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.