The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 17, 1983
Filed:
Feb. 02, 1981
Albert Pfiffner, Bulach, CH;
Hoffmann-La Roche Inc., Nutley, NJ (US);
Abstract
The invention relates to an improved process for the preparation of fungicidally active compounds of the formula ##STR1## wherein R.sub.1 and R.sub.2 individually are lower alkyl of from 1 to 4 carbons or halo-(lower alkyl) of from 1 to 4 carbons or R.sub.1 and R.sub.2 together with the carbon to which they are attached form a 3 to 7 membered cycloalkyl ring or lower alkyl-substituted cycloalkyl of from 4 to 9 carbons, R.sub.3, R.sub.4 and R.sub.5 individually are hydrogen or lower alkyl of from 1 to 4 carbons and X is methylene or oxygen, and salts of those compounds which are basic. The improved process comprises the reaction of a compound of the formula, ##STR2## wherein R.sub.3, R.sub.4, R.sub.5 and X have the significance given hereinabove, with a compound which forms a carbonium ion of the formula ##STR3## wherein R.sub.1 and R.sub.2 have the significance as given hereinabove.