Fluorinated azo dyes. II. Synthesis and spectral properties of 2, 6-difluoro-4 and 2, 3, 5, 6-tetrafluoro-4-aminoazobenzene and their N-methylated and 4'-ethyl …

MJ Namkung, NK Naimy, CA Cole…

Index: Namkung,M.J. et al. Journal of Organic Chemistry, 1970 , vol. 35, # 3 p. 728 - 733

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Citation Number: 8

Abstract

A number of new polyfluorinated azo dyes have been synthesized: 2, 6-difluoro-4- aminoazobenzene (and its N-methyl and N, N-dimethyl derivatives), 2, 3, 5, 6-tetrafluoro-4- aminoazobenzene (and the N-methyl and N, N-dimethyl derivatives), the 4I-ethyl derivative of all of these dyes, and the 4'-ethyl-~ ubstituted derivatives of the 3, j-difluoro azo dyes reported earlier. Ib Visible and ultraviolet spectra were studied; noteworthy photochromic ...