Co-catalyzed reaction between cyclopentene and 1-phenyl-1-propyne has been reported. Bonding properties of 1-phenyl-1-propyne on Cu(111) at 100K have been studied using temperature-programmed desorption and X-ray, ultraviolet and two-photon photoemission spectroscopies. 1-Phenyl-1-propyne is an inhibitor of dopamine beta-hydroxylase. Polymerization of 1-phenyl-1-propyne by TaCl5 and NbCl5 has been reported.