1. V. Grignard and L. Zorn, Compt. Rend.,50, 1177 (1910).
2. E. P. Kohler and H. Potter, J. Am. Chem. Soc.,57, 1316 (1965).
3. R. Oda and K. Yamamoto, J. Org. Chem.,26, 4679 (1961).
4. A. Sekera, J. E. Fauet, and P. Rumpf, Ann. Chim.,10, 413 (1965).
5. P. Manya, A. Sekera, and P. Rumpf, Compt. Rend.,264, 1196 (1967).