Process for preparing 2-chloro-benzothiazoles or 2-chloro-benzox

Details Process for preparing 2-chloro-benzothiazoles or 2-chloro-benzox Process for preparing 2-chloro-benzothiazoles or 2-chloro-benzox

1994-04-20

1996-03-26

Gerstl, Robert

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548217, C07D27768, C07D26354

Patent

active

055022014

ABSTRACT:
The title compounds of the formula ##STR1## in which R.sup.1 and R.sup.2, independently of one another, represent hydrogen, straight-chain or branched C.sub.1 -C.sub.4 -alkyl, straight-chain or branched C.sub.1 -C.sub.4 -alkoxy, nitro, fluorine, chlorine, bromine, SO.sub.2 Cl, cyano or SO.sub.2 -C.sub.1 -C.sub.4 -alkyl, and
X represents sulphur or oxygen,
can be prepared from the corresponding 2-mercapto-benzothiazoles or 2-mercapto-benzoxazoles by chlorination with thionyl chloride in the presence of phosphorous acid compounds of the formula

REFERENCES:
patent: 2469697 (1949-05-01), Moon
patent: 3284294 (1966-11-01), Sasse et al.
patent: 4229565 (1980-10-01), Gardner
patent: 4334073 (1982-06-01), Diehr
patent: 4509971 (1985-04-01), Forster et al.
patent: 4517370 (1985-05-01), Becherer et al.
patent: 4833243 (1989-05-01), Forster et al.
Chemical Abstracts, vol. 43, Aug. 25, 1949, No. 16, 6670, 1 page. "2-Chlorobenzothiazole", N.S. Moon, USP 2,469,697.
Chemical Abstracts, vol. 101, Aug. 27, 1984, No. 9, p. 644; CA#72718s: "2-Chlorobenzothiaole"; Czech Patent 213,291.
Japanese Chemical Abstract, FARB, CO2, 86262B/48=J5 4154-762; "2-carbamoyl:methoxy-benzoxazole and benzothiazole . . . " Bayer AG, Feb. 2, 1979. (1 page).

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