Abstract
Synthesis of Functionalized Bi(cyclopropylidenes) In view of the synthesis of attractive triafulvalene precursors 9, a series of bi(cyclopropylidenes) 8 with vinyl- (8a), alkoxycarbonyl (8c – f), hydroxymethyl (8h), as well as protected hydroxymethyl groups (8g, 8i) have been prepared by simple one-pot reactions of the corresponding 1,2-dibromo-cyclopropanes 6 with BuLi/CuCl2 at −95°. First experiments towards a direct low-temperature synthesis of bi(cyclopropylidenes) bearing good leaving groups 9k (X=AcO) and 9l (X=Br) are reported.
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