... PrInted In Great Brltaln 01982 Pergamon Press Ltd. A NOVEL STEREOSPECIFIC SYNTHESIS OF (f)-LEUKOTRIENE AQ(LTAI+),ME~YL ESTER Judrth C Buck, Frank Ellis and Peter C North* Chemistry Dlvlslon, Glaxo Group Research Ltd , Ware, Hertfordshlre SG12 ODJ, England ... coup- ling of 5 with the ylid derived from the phosphonium salt 5 ' (1 equivalent of n-butyl- _ ...