Synthesis and properties of dihetaryl-substituted furanones. Synthesis of photochromic dithienylethenes containing a furanone bridging fragment

Abstract

The reaction of 2,5-dimethylthiophen-3-ylacetic acid with 2,5-dimethylthiophen-3-ylacetyl chloride gave 3,4-bis(2,5-dimethylthiophen-3-yl)furan-2(5 H )-one which was converted into a series of 5-methylidene and 5-arylmethylidene derivatives.