Advances in ORGANOMETALLIC CHEMISTRY VOLUME 24 CONTRIBUTORS TO THIS VOLUME Neil G. Connelly Gerhard Erker William J. Evans William E. Geiger Gregory L. Geoffroy Wayne L. Gladfelter Carl Kruger Gerhard Muller Daniel 6. Pourreau William N. Setzer Paul von Ragu6 Schleyer Nils Wiberg Advances in Organometallic Chemistry EDITED BY F. G. A. STONE ROBERT WEST DEPARTMENT OF INORGANIC CHEMISTRY DEPARTMENT OF CHEMISTRY UNIVERSITY OF WISCONSIN THE UNIVERSITY MADISON. WISCONSIN ERISTOL. ENGLAND VOLUME 24 1985 ACADEMIC PRESS, INC. (Harcourt Brace Jovanovich, Publishers) Orlando San Diego New York London Toronto Montreal Sydney Tokyo COPYRIGHT 0 1985, BY ACADEMIC PRESS, INC. ALL RIGHTS RESERVED. NO PART OF THIS PUBLICATION MAY BE REPRODUCED OR TRANSMITTED IN ANY FORM OR BY ANY MEANS, ELECTRONIC O R MECHANICAL, INCLUDING PHOTOCOPY, RECORDING, OR ANY INFORMATION STORAGE AND RETRIEVAL SYSTEM, WITHOUT PERMISSION IN WRITING FROM THE PUBLISHER. ACADEMIC PRESS, INC. Orlando, Florida 32887 United Kingdom Edition published by ACADEMIC PRESS INC. (LONDON) LTD. 24-28 Oval Road, London NWI 7DX LIBRARY O F CONGRESS CATALOG CARD NUMBER: 64-16030 ISBN: 0-12-031 124-0 PRINTED IN THE UNITED STATES OF AMERICA K5 86 87 80 9 8 7 6 5 4 3 2 1 Contents CONI'RIBII~OKS . . . . . . . . . . . . . . . . . . . . . . . ix . The Remarkable Features of (q4-Conjugated Diene)zirconocene and -hafnocene Complexes GERHARD ERKER, CARL KRUGER, and GERHARD MULLER I. II. 111. IV. V. Introduction . . . . . . . . . . . . . . . . Formation of (?'-I .3-Diene)zirconocenes and -hafnocenes . Identification of the CpzM(diene)Species . . . . . . Chemistry of the (.~-c~is-/s-r~un.s-~~-Diene)metallocenr Isomer Pairs . . . . . . . . . . . . . . . . Concluding Remarks . . . . . . . . . . . . References . . . . . . . . . . . . . . . . . . . . . I 2 I3 . . . . . . . . . . . . . 26 33 34 . . . . . . . . . . . . . . . . . . . . . Organometallic Metal Clusters Containing Nitrosyl and Nitrido Ligands WAYNE L. GLADFELTER I. 11. 111. IV. Introduction . Nitrosyl Clusters Nitrido Clusters Overview . . Keferencea . . . . . . . . . . . . . . . . . . . . . 41 42 62 XI 82 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . The Electron-Transfer Reactions of Polynuclear Organotransition Metal Complexes WILLIAM E. GEIGER and NEIL G . CONNELLY I. 11. 111. IV. V. Introduction . . . . . . Multiple Sandwich Compounds Bridged Bimetallic Compounds Metal Clusters . . . . . Addendum . . . . . . References . . . . . . . . . . . . . . . . . .