this invention comprises certain analogs of the prostaglandins in which the double bond between c - 13 and c - 14 is replaced by a triple bond . also provided in this invention , are novel chemical processes and novel chemical intermediates useful in the preparation of the above prostaglandin analogs . these prostaglandin analogs exhibit prostaglandin - like activity , and are accordingly useful for the same pharmacological purposes as the prostaglandins . among these purposes are blood pressure lowering , labor induction at term , reproductive - cycle regulation , gastric antisecretory action , and the like .