Abstract: The liquid-phase photolysis of simple alkynes is first examined with 185-nm light and the mechanism is discussed. The direct irradiation of 1-or 5-decyne in pentane gave the corresponding alkene, Le., 1-decene (@= 0.14) or cis-and trans-5-decenes (@= 0.10 and 0.16, respectively); the photolysis of cyclononyne led to the formation of bicyclo [4.3. 0] nona- l-ene (@= 0.25) in addition to the reduction product, cyclononene (@= 0.16). The ...
