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:
Jul. 03, 1979
Filed:
Jan. 26, 1978
Rudolf Pistorius, Ober-Morlen, DE;
Hoechst Aktiengesellschaft, Frankfurt am Main, DE;
Abstract
Cyclohexene-(1)-dione-(3,6)-tetraalkyldiketals of the formula ##STR1## wherein each R is a primary or secondary C.sub.1-4 alkyl radical are obtained by catalytic hydrogenation of p-benzoquinone tetramethyl-diketal with about 1 mol of H.sub.2 per mole of diketal, in a basic medium, at a temperature of from about -10.degree. to +150.degree. C. and optionally by reketalization with a primary or secondary C.sub.2-4 alcohol in a slightly acid medium with substantial exclusion of water, at a temperature of from about -10.degree. to +35.degree. C. Cyclohexene-(1)-dione-(3,6)-tetraalkyldiketals, optionally dissolved in an alcohol ROH give hydroquinone dialkyl ethers on acidification and heating to about 60.degree. to 120.degree. C., which ethers are valuable dyestuff intermediates. On catalytic hydrogenation in a basic medium, cyclohexene-(1)-dione-(3,6)-tetraalkyldiketals give the corresponding cyclohexane-(1,4)-tetraalkyldiketals, which are the starting products for the manufacture, for example, of tetracyanoquinodimethane, an important compound in the field of semiconductors.