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:
Nov. 04, 1997
Filed:
Feb. 21, 1996
Christoph Naumann, Niedernhausen, DE;
Ahmed Tafesh, Kelkheim, DE;
Dieter Regnat, Eppstein, DE;
Hans-Jerg Kleiner, Kronberg, DE;
Hoechst Aktiengesellschaft, , DE;
Abstract
The present invention relates to sulfonated diphosphines of the formula (I) ##STR1## where M is hydrogen, ammonium, a monovalent metal or the equivalent of a polyvalent metal, a, b, c and d are each 0 or 1, with the proviso that a+b+c+d is an integer from 1 to 4, Ar is an m-(MSO.sub.3)--C.sub.6 H.sub.4 radical and M is as defined above, n is 0, 1 or 2, Ph is a phenyl radical, R.sup.1 and R.sup.2 are identical or different and are each an alkyl radical having from 1 to 10 carbon atoms or a cycloaliphatic radical having from 5 to 10 carbon atoms in the ring, and a process for their preparation.