1. a) L. Horner and E. Jurgens, Angew. Chem., 70(1958)268. b) L. Horner, J. Polym. Soi., 18(1955)438. c) L. Horner and H. Winkler, Tet. Lett., (1964)3275.
2. J.T. Edward, J. Chem. Soc., (1954)1464; Ibid., (1965)222.
3. J.T. Edward and H.S. Chang, Can. J. Chem., 40(1962)804.
4. C.W. Capp and E.G.E. Hawkins, J. Chem. Soc., (1953)4106.
5. R. Huisgen and F. Bayerlein, Ann., 630(1959)138.