Process for the manufacture of 2,5-bis-(benzoxazolyl)-thiophene

Details Process for the manufacture of 2,5-bis-(benzoxazolyl)-thiophene Process for the manufacture of 2,5-bis-(benzoxazolyl)-thiophene

1979-11-14

1981-05-12

Berch, Mark L.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548219, 549 84, C07D40914, C07D41312

Patent

active

042673437

ABSTRACT:
A process for the manufacture of 2,5-bis-(benzoxazolyl)-thiophenes of the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 represent hydrogen or certain non-chromophoric substituents and each of R.sub.4 and R.sub.5 independently represents a hydrogen atom or an alkyl group or together they represent a trimethylene or tetramethylene radical, by reacting a sulphide of the formula ##STR2## with a dicarbonyl compound of the formula ##STR3## or with a derivative thereof is described.

REFERENCES:
patent: 2995564 (1961-08-01), Duennenberger
patent: 3095421 (1963-06-01), Liechti
patent: 3127416 (1964-03-01), Liechti
patent: 3641044 (1972-02-01), Matta
Elderfield, "Heterocyclic Compounds", vol. 5, (Wiley & Sons), 1957, p. 438.
Wynberg et al., J. Amer. Chem. Soc. 87,1739-1741, (1965).
Johnson et al., J. Amer. Chem. Soc. 72,514, (1950).
Hinsberg, Berrehtre 43,901-906 (1910) and 45,2413-2418 (1912).
Brown et al., J. Chem. Soc. 1948, 2147.
Johnson et al., Org. Reactions 6, p. 1 (1951).

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