Scheme 3.
Homo and cross-coupling reactions of 6 or 7 afford BPTTFs and MPTTFs, respectively. Reagents and conditions: a) (EtO)3P, 120–130 °C, 5–5.5 h, 76–79%; b) (EtO)3P, 120–135 °C, 1–4 h, 70–87%.
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