Synthesis of the tumor-inhibitory tobacco constituents .alpha.- and .beta.-2,7,11-cembratriene-4,6-diol by diastereoselective [2,3] Wittig ring contraction
Synthesis of the tumor-inhibitory tobacco constituents .alpha.- and .beta.-2,7,11-cembratriene-4,6-diol by diastereoselective [2,3] Wittig ring contraction