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:
Sep. 06, 1983
Filed:
Aug. 21, 1981
Applicant:
Inventor:
Jurg Kiefer, Reinach, CH;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07F / ;
U.S. Cl.
CPC ...
260980 ; 2609 / ; 260988 ;
Abstract
The reaction of phosphonic acid or a phosphonic acid ester of the formula II ##STR1## with a phosphonic acid dichloride of the formula III ##STR2## wherein R, R.sup.1 and R.sup.2 are as defined in claim 1, gives a phosphonic anhydride of the formula IV ##STR3## which, with or without being isolated from the reaction solution, is reacted with pentaerythritol, in the temperature range from 60.degree. to 120.degree. C., to give a compound of the formula I ##STR4## the molar ratio of anhydride of the formula IV to pentaerythritol being about 2:1.