Patent ID: 6063971
Filing Date: 2000-05-16
Classification: C07C

Abstract:
A process for producing a compound of the formula (I) ##STR8## wherein Hal is chlorine or bromine, and R.sup.1 to R.sup.5 are, each independently, hydrogen, unsubstituted or substituted C.sub.1 -C.sub.10 -alkyl, or unsubstituted or substituted C.sub.6 -C.sub.10 -aryl;comprising reacting a compound of the formula (II) ##STR9## wherein R.sup.1 to R.sup.5 are the same as above with chlorine or bromine, the chlorine or bromine being in an excess of at least 5 mol % compared to the compound of formula (II), with an organic phosphorus compound of the formula (III) ##STR10## wherein each Ar is independently an unsubstituted or substituted C.sub.6 -C.sub.10 -aryl, the process yielding the compound of formula (I) having a purity of over 95%.