Journal of the American Chemical Society, , vol. 75, p. 921,923 Organic Syntheses, , vol. Coll. Vol. IV, p. 573,575 Yakugaku Zasshi, , vol. 77, p. 248,249 Yakugaku Zasshi, , vol. 77, p. 256 Chem.Abstr., , p. 8671;8672