Journal of the American Chemical Society

Cyanine Dyes. I. Absorption of Cyanines Derived from Pyranothiazole and Thiopyranothiazoles1

RH Sprague

Index: Sprague Journal of the American Chemical Society, 1957 , vol. 79, p. 2275,2280

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Citation Number: 3

Abstract

The well known synthesis of 2-methylthiazoles by condensation of thioacetamide with a- haloketones2 has been employed to prepare thiazole bases from 3-bromotetrahydro-4- pyrone, 3-bromotetrahydro-1-thio-4-pyrone and 2-bromotetrahydro-1-thio-3-pyrone. Thus 3- bromotetrahydro-4-pyrone was treated with thioacetamide giving 2-methyl-6, 7-dihydro-4-H- pyrano [4, 3d] thiazole (I). Although (I) has not been reported in the literature, the ...