Method for preparing 6H-dibenzo[c,e][1,2]oxaphosphorin-6-one

Details Method for preparing 6H-dibenzo[c,e][1,2]oxaphosphorin-6-one Method for preparing 6H-dibenzo[c,e][1,2]oxaphosphorin-6-one

1994-06-30

1996-01-02

Ramsuer, Robert W.

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

Organic compounds

Phosphorus esters

558122, C07F 96574

Patent

active

054810175

ABSTRACT:
Process for the preparation of 6H-dibenzo [c,e][1,2]oxaphosphorin-6-one of the formula ##STR1## in which R.sup.1 and R.sup.2 are identical or different and are halogen or an alkyl or alkoxy group having from 1 to 6 carbon atoms and a and b are identical or different and are 0, 1, 2 or 3, which involves reacting a 6-chloro-(6H)-dibenzo[c,e][1,2]oxaphosphorin of the formula ##STR2## in which R.sup.1, R.sup.2, a and b are as defined above, with water in a molar ratio of 1:1 at from 50.degree. to 250.degree. C., in the presence if desired of a solvent, and separating off gaseous hydrogen chloride at the rate at which it is formed.

REFERENCES:
patent: 4086206 (1978-04-01), Saito et al.
Journal of General Chemistry of the USSR, "Organophosphorus Heterocyclic Compounds" vol. 42, pp. 87-90, Jan. 1972.
Chemical Abstracts, vol. 103, No. 11, Sep. 16, 1985, abstract No. 88080e.
Chemical Abstracts, vol. 77, No. 23, Dec. 4, 1972, abstract No. 152357z.

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