Process for preparing 6-chloro-(6H)-dibenz [C,-E][1,2]- oxaphosp

Details Process for preparing 6-chloro-(6H)-dibenz [C,-E][1,2]- oxaphosp Process for preparing 6-chloro-(6H)-dibenz [C,-E][1,2]- oxaphosp

1993-08-09

1995-02-21

Lee, Mary C.

Organic compounds -- part of the class 532-570 series

Organic compounds

Phosphorus esters

C07F 96574

Patent

active

053917987

ABSTRACT:
Process for preparing 6-chloro-(6H)-dibenz[c,e][1,2]oxaphosphorin of the formula (I), ##STR1## in which R.sup.1 and R.sup.2 are identical or different and are halogen, alkyl or alkoxy, each having from 1 to 6 carbon atoms, and a and b are integers from 0 to 3, preferably from 0 to 2, by reaction of o-phenylphenol of the formula (II), ##STR2## in which R.sup.1, R.sup.2, a and b are as defined above, with phosphorus trichloride in the presence of Lewis acids as catalysts with elimination of hydrogen chloride, wherein the phosphorus trichloride is metered into the mixture of compound (II) and Lewis acid at temperatures of 170.degree.-220.degree. C.

REFERENCES:
patent: 3702878 (1972-11-01), Saito
patent: 4086206 (1978-04-01), Saito et al.
Pastor, S. D., et al, Phosphorus and Sulfur 31:71-76 (1987).

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