Regiochemistry and stereochemistry of the coupling of phenylthiopentadienyl metals with C-electrophiles

Article abstract of DOI:10.1016/0040-4039(90)80219-C

Phenylthiopentadienyl anions 2 couple with MeI and cyclopentanone either regioselectively and stereoselectively to give 3a and 4a respectively. With aldehydes the regiochemistry and stereochemistry is affected by the counterion of 2, furnishing α-, γ- or