The synthesis of benzo[b]triphenyleno[2,1‐d]thiophene (9), benzo[b]triphenyleno[1,2‐d]thiophene (13), 5‐methylbenz[7,8]anthra[2,1‐b]thiophene (17), l‐methylchryseno[3,4‐b]thiophene (18), triphenyleno[1,2‐c]dibenzothiophene (22), triphenyleno[2,1‐a]dibenzothiophene (26), triphenyleno[1,2‐a]dibenzothiophene (29), and triphenyleno[2,1‐b]dibenzothiophene (30) is described.
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Baldwin et al. (1984) studied this question.
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