1. Price, C. C. 1962., Edited by: Oae, S. 120New York, N.Y.: Ronald Press. See also F. Bernardi, A. Mangini, N. D. Epiotis, and J. R. Larson, 7465 (1977);
2. M. J. Janssen in, S. Patai, ed., Wiley-Interscience, New York, N.Y., 1969, p. 705. It should be noted that the relatively large Okamoto-Brown substituent constant for sulfur certainly indicates an ability of sulfur to interact with a neighboring spcenter by resonance; O. Exner, in, N. B. Chapman and J. Shorter, eds. Plenum Press, London, 1972, Ch. 1
3. Physical and Chemical Effects of Substituent Groups on Multiple Bonds. II. Thiolesters1
4. Jencks, W. P. 1969.Catalysts in Chemistry and Enzymology, 517New York, N.Y.: McGraw-Hill Book Co., Inc.