0 All reactions were carried out at room temperature with SP 409 according to the general procedure. yield (entry 3). Due to the unusually low frequency16 of the carbonyl stretch exhibited in the IR spectrum of 9 (1610 cm-I), chemical confirmation of the structure of this compound was obtained upon derivatization into the corresponding methyl ester. l6 Unfortunately, the potentially interesting saturated analogue of 8 could not be obtained ...