Abstract
A rhodacyanine dye, 1-ethyl-2-[[3-ethyl-5-(3-methylbenzothiazolin-2-ylidene)-4-oxothiazolidin-2-ylidene]-methyl] pyridinium chloride (MKT 077, 1) was oxidized by self-sensitized singlet oxygen to produce two carbonyl compounds under photo-radiation, one of which was further rearranged via Norrish Type I like cleavage to give new types of merocyanine dyes ( 5 and 8). The merocyanine dyes were also synthesized by the treatment of thioamide ( 6) with oxalyl chloride.
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