Acknowledgments. This work was supported in part by Public Health Service Grant GM-12139, from the Institute of General Medical Sciences. One of us (B. BJ) also wishes to acknowledge, with thanks, fellowship support from the Shell Companies Founda- tion, Inc. ... (27) R. Mozingo, “Organic Syntheses,” Coll. Vol. 111, John Wiley and Sons, Inc., New York, N. Y., 1955, p 181. ... (28) W. R. Vaughan and A. C. Schoenthaler, J. Am. Chem. Soc., SO, ...