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α-Substituted γ-alkoxyallylstannanes were obtained from β-tributylstannyl acrolein acetals when reacted with lower order magnesium cyanocuprates in the presence of boron trifluoride at low temperature. In the case of n-alkylcyanocuprates an anti S N 2′ substitution on a cisoid conformation appears to be the main reaction pathway. However, subtle competitions with other mechanisms may occur...
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