Complexes of propargyl carbonates 1 react with organocopper(I) compounds stereo selectively to yield the α-(allenylbutadiene)tricarbonyliron complexes 2. Decomplexation with eerie ammonium nitrate furnishes the α-[(lE,3E)-dienyl]allenes 3 rapidly and in high yields. R1 Ph, tBu, SiMe3; R2 Et; E Co2Me.
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Nunn et al. (1992) studied this question.
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