Chemical Reviews Published bimonthly by the American Chemical Society at 20th and Northampton Streets, Easton, Pennsylvania
HAROLD HART, Editor Michigan State University, East Lansing, Michigan 48823 Editorial Advisory Board Joseph F. Bunnett, University of California, Santa Cruz, California Theodore L. Brown, University of Illinois, Urbana, Illinois A. I. Scott, Yale University, New Haven, Connecticut William T. Simpson, University of Oregon, Eugene, Oregon William M. Jones, University of Florida, Gainesville, Florida
Published by the AMERICAN CHEMICAL SOCIETY 1155 16th Street, N.W. Washington, D. C. 20036
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© Copyright 1973, by the American Chemical Society. Second class postage paid at Washington, D. C , and at additional mailing offices. This publication is authorized to be mailed at the special rates of postage prescribed by Section 132.122. CHEMICAL REVIEWS is published by the American Chemical Society to provide authoritative critical reviews and comprehensive summaries of recent research in theoretical chemistry. The publication of reviews in various fields is scheduled about a year in advance. The Editor welcomes suggestions for timely reviews. All prospective authors should read Suggestions to Authors of Articles for Chemical Reviews in Chem. Rev., 7 1 , 1 (1971),
Howard E. Simmons, E. I. du Pont de Nemours & Co., Inc., Wilmington, Delaware Richard Bersohn, Columbia University, New York, New York Richard H. Holm, Massachusetts Institute of Technology, Cambridge, Massachusetts Andrew S. Kende, University of Rochester, Rochester, New York
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