derivatives of alkynecarboxylic acids were prepared. The orthoamides were converted into propiolamidinium chlorides by reaction with benzoyl chloride and into propiolamidinium triflates by reaction with triethylsilyl trifluoromethanesulfonate. Propiolamidinium salts undergo conjugate addition reactions with sec-amines and thiols. Treatment of terminal alkyne chlorides with silver(I) oxide afforded a silver complex