STEREOSELECTIVE CYCLIZATION OF α-ALKOXYALLYLSTANNANE ALKYNALS AND THEIR Co-COMPLEXES. A NEW ROUTE TO CYCLODODECYNE-1,2-DIOL DERIVATIVES

Article abstract of DOI:10.1016/S0040-4039(00)95187-6

The α-alkoxystannane dicobalt hexacarbonyl alkynal complex 18 afforded the cyclododecadienyne alcohol complex 19 as a single diastereoisomer in 70percent yield upon treatment with BF3*Et2O at -78 deg C.The reaction is thought to proceed by prior isomeriza