Abstract 2-Alkylcyclopentenones,(1) and (2), are in general useful precursors in the synthesis of the prostaglandins assembly via conjugate addition of organometallic derivatives. 1 For example, the cyclopentenone (1) has served as a versatile prostaglandin intermediate for a variety of 11-deoxyprostanoids such as PGB1, 11-deoxy-PGE1, 11, 15-bis- deoxy-PGE1, 11-deoxy-13, 14-dihydro-PGE1, 11-deoxy-13, 14-dihydro-PGF1α, and 11- ...