u2550 ch r 2 and r 4 of the l 1 moiety and r 5 of the m 1 moiety are all hydrogen and r 7 is str40 a the method ester of the title product of preparation 3 prepared by ethereal diazomethane esterification is transferred to a formula lxxxii 15 silyl derivative following the procedure of example 1 part a b following the procedure of example 1 part b the reaction product of part a above is transformed to the title product 9 deoxy 9 methylene pgf 1 formula lxxiv r 1 is hydrogen z 1 is ch 2 5 r 8 is hydrogen r 3 and r 4 of the l 1 moiety and r 5 of the m 1 moiety are all hydrogen and r 7 is n butyl or its methyl ester a following the procedure of example 1 part a 10 5 g of pge 1 methyl ester 360ml tetrahydrofuran 144 ml of hexamethyldisilizane and 29 8 ml of chlorotrimethylsilane are reacted to yield pge 1 methyl ester 11 15 bis trimethylsilyl ether b following the procedure of example 1 part b 11 4 g of the reaction product of part a and 8 55 g of n s dimethyl s phenylsulfoximine and 16 7.