Thiophen Analogues of Indene

Thiophen Analogues of Indene. - Detailed papers on the reaction of diazo-indenothiophens with DMAD and methyl propiolate have now been published. This investigation has been extended to the reaction with mono- and di-benzoylacetylene, which gave similar products, such as (257). However, the benzo-fused indene gave (258) as the main product. By 

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Thiophen Analogues of Indene.—Quantitative data for the base-catalysed tautomerization of the 4-methyl- to the 6-methyl-4 T-cyclopenta[c]thipphen have been obtained. The tautomerization was about 10 times slower than that of 1-methylindene. 107f-Indeno[l,2-Z>][l]benzothiophen has been prepared by treating 2-phenylbenzo[6]thiophen-3-carboxaldehyde with sodium methoxide in hot bis(2-methoxyethyl) ether. ... 

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