Journal of Organic Chemistry, , vol. 27, p. 486,488 Bulletin des Societes Chimiques Belges, , vol. 41, p. 217,219 Bulletin des Societes Chimiques Belges, , vol. 42, p. 238 Adv. Catalysis, , vol. 9, p. 15,18 Journal of the American Chemical Society, , vol. 84, p. 3136,3137