Chemical Reviews Published bimonthly by the American Chemical Society at 20th and Northampton Streets, Easton, Pennsylvania
ANTHONY M. TROZZOLO, Editor Jay A. Labinger, Associate Editor University of Notre Dame, Notre Dame, Indiana 46556 Editorial Advisory Board John I. Brauman, Stanford University, Stanford, California Joseph F. Bunnett, University of California, Santa Cruz, California Marjorie C. Caserio, University of California, Irvine, California Edwin A. Chandross, Bell Laboratories, Murray Hill, New Jersey Orville L. Chapman, University of California, Los Angeles, California
Published by the AMERICAN CHEMICAL SOCIETY BOOKS AND JOURNALS DIVISION D. H. Michael Bowen, Director Marjorie Laflin, Assistant to the Director
Journals Department: Charles R. Bertsch, Head; Marianne C. Brogan, Associate Head; Eileen B. Segal, Production Editor; Jane U. Lutick, Production Assistant Magazine and Production Department: Bacil Guiley, Head Research and Development Department: Seldon W. Terrant, Head
© Copyright, 1979, by the American Chemical Society. Permission of the American Chemical Society is granted for libraries and other users to make reprographic copies for use beyond that permitted by Sections 107 or 108 of the U.S. Copyright Law, provided that the copying organization pay the appropriate per-copy fee through the Copyright Clearance Center, Inc. Educa tional institutions are generally granted permission to copy upon application to Office of the Director, Books and Journals Division, at the ACS Washington ad dress. Published bimonthly in February, April, June, August, October, and December by the American Chemical Society at 20th and Northampton Sts., Easton, Pa. 18042. Second class postage paid at Washington, D.C., and at additional mailing offices.
American Chemical Society 1155 16th St., N.W. Washington, D.C. 20036 (202) 872-4600
Gerhard L. Closs, University of Chicago, Chicago, Illinois Lawrence F. Dahl, University of Wisconsin, Madison, Wisconsin Raymond A. Firestone, Merck Sharp & Dohme Laboratories, Rahway, New Jersey Richard H. Holm, Stanford University, Stanford, California John S. Waugh, Massachusetts Institute of Technology, Cambridge, Massachusetts
Editorial Information CHEMICAL REVIEWS is published by the American Chemical Society to provide authoritative critical reviews and com prehensive summaries of recent research in theoretical chemistry. The publication of reviews in various fields is scheduled about a year in ad vance. The Editor welcomes suggestions for timely reviews. All prospective authors should read Suggestions to Authors of Articles for Chemical Reviews in Chem. Rev., 79, 3A (1979), and follow the pro cedure for obtaining preliminary approval before preparing the manuscript. Unin vited manuscripts will be examined by the Editorial Board but are placed at the end of the prearranged schedule. Manuscripts for publication should be submitted to the Editor, Dr. Anthony M. Trozzolo, at his Notre Dame address. In clude a signed ACS copyright transfer form, a copy of which appears on ρ 5Α of the February issue. Correspondence regarding accepted papers and proofs should be directed to the Journals Department at the ACS Easton address. Bulk reprints or photocopies of indi vidual articles are available. For infor mation write to Business Operations, Books and Journals Division, at the ACS Washington address. An order form showing costs for reprints is sent to the author along with the galley proofs. The American Chemical Society and its Editors assume no responsibility for the statements and opinions advanced by contributors. Subscription and Business Information 1979 subscription prices, printed or microfiche, including, postage. Microfiche Membership & Subscription Services American Chemical Society P.O. Box 3337 Columbus, Ohio 43210 (614) 421-7230
by air mail; printed by surface mail. Printed edition air mail or air freight rates avail able from Membership & Subscription Services at the ACS Columbus address.
Member Nonmember
Domestic
Foreign
$17.00 68.00
$21.00 72.00
Subscriptions are available only on a calendar year basis. New and renewal subscriptions should be sent with payment to the Office of the Controller at the ACS Washington ad dress. Change of address must include both old and new addresses with ZIP code and a recent mailing label. Send all ad dress changes to the ACS Columbus ad dress. Please allow 6 weeks for change to become effective. Claims for missing numbers will not be allowed if loss was due to failure of notice of change of ad dress to be received in the time specified; if claim is dated, (a) North America, more than 90 days beyond issue date, (b) all other foreign, more than one year beyond issue date; or if the reason given is "missing from files". Hard copy claims are handled at the ACS Columbus ad dress. Microfilm and microfiche editions of all ACS primary publications, by single vol ume or back issue collection, are avail able. For additional price and subscription information, contact Microforms Program at the ACS Washington address or call (202) 872-4554. To order single issues or back volumes of the printed edition, contact Special Issues Sales at the ACS Washington ad dress, or call (202) 872-4365. Current year single issue $13,00. Prior year single issue $13.50. Back volume $75.00. For eign postage additional. Journals Department American Chemical Society 20th and Northampton Sts. Easton, Pennsylvania 18042 (215) 258-9111