Tetrahedron letters

Thioindigo precursor: control of polymorph of thioindigo

H Uno, K Moriyama, T Ishikawa, N Ono, H Yahiro

Index: Uno, Hidemitsu; Moriyama, Kana; Ishikawa, Takayuki; Ono, Noboru; Yahiro, Hidenori Tetrahedron Letters, 2004 , vol. 45, # 49 p. 9083 - 9086

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Citation Number: 6

Abstract

2, 2′-Bi [-3 (2H)-thiophenon] ylidene with two bicyclo [2.2. 2]-octadiene moieties was quantitatively converted to thioindigo by the retro-Diels–Alder reaction. The thioindigo solid obtained from the precursor had the P21/c structure which was different from the commercial thioindigo samples (P21/n).