Process for preparing 2-chlorobenzoxazoles

Details Process for preparing 2-chlorobenzoxazoles Process for preparing 2-chlorobenzoxazoles

1983-02-18

1985-05-14

Rizzo, Nicholas S.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D26354

Patent

active

045173702

ABSTRACT:
In the process for preparing 2-chlorobenzoxazoles of the formula ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4 is independently of one another, H, chloro or alkyl having 1 to 4 carbon atoms, which comprises reacting chlorine with 2-mercaptobenzoxazoles of the formula ##STR2## wherein the improvement comprises providing a melt of previously prepared 2-chloro-benzoxazole, adding the 2-mercaptobenzoxazole reactant to the 2-chlorobenzoxazole melt and simultaneously or subsequently passing chlorine into the melt, with the proviso that substituents R.sup.1 to R.sup.4 are identical in both the 2-chlorobenzoxazole melt and the 2-mercaptobenzoxazole reactant.

REFERENCES:
patent: 3284294 (1966-11-01), Sasse et al.
J. pr. Chemie, 42, 454, (1980).
Boll. Sci. Fac. Chem. Ind. Bologna 23, (2-3), 89 to 98, (1965).

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