Patent ID: 7317119
Filing Date: 2008-01-08
Classification: C07F,C08K

Abstract:
1. A process for the preparation of 9,10-dihydro-9-oxa-10-organyloxy-phosphaphenanthrene-10-oxide or -thione and derivatives of Formula Vla or Vlb comprising the steps of: (a) reacting 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide or a derivative of same according to Formula Ia or Ib,  in which R  in which R  with at least one ortho ester of Formula II  in which R  wherein the product obtained in step (a) has the Formula IVa or IVb  in which the radicals R (b) transforming the intermediate product from step (a) by addition of oxidation agent into 9,10-dihydro-9-oxa-10-organyloxyphosphaphenanthrene-10-oxide or -thione or a derivative of same substituted on the phenyl groups,  wherein the product obtained in step (b) has the Formula VIa or VIb  in which R