Organometallic Complexes of Dienes and Polyenes

Abstract

1. Introduction2. Structure and Bonding3. NMR Spectroscopic Characterization and Fluxional Behavior4. Preparation and Isomerizations of Conjugated Diene Complexes5. Reactions of Conjugated Diene Complexes6. Preparation of Cyclobutadiene–Metal Complexes7. Reactions of Cyclobutadiene–Metal Complexe

Synthesis of 1-Azatriene Complexes of Tungsten: Metal-Promoted Ring-Opening of Dihydropyridine

“…Since Reihlen and co-workers first reported the complex Fe­(CO) 3 (η 4 -1,3-butadiene) in 1930, chemists have been fascinated by the ability of transition metals to influence the physical and chemical properties of conjugated polyenes . The vast majority of these studies have focused on η 4 -, η 5 -, and η 6 -coordinated polyenes, with some of the most significant developments historically involving iron. , By comparison, much less is known about the properties of their η 2 -bound counterparts. Of the few complexes reported that involve nonaromatic polyenes, most are cyclooctatetraene complexes of Mn, , Cu, and Ni .…”

“… 2 The vast majority of these studies have focused on η 4 -, η 5 -, and η 6 -coordinated polyenes, with some of the most significant developments historically involving iron. 2 , 3 By comparison, much less is known about the properties of their η 2 -bound counterparts. Of the few complexes reported that involve nonaromatic polyenes, most are cyclooctatetraene complexes of Mn, 4 , 5 Cu, 6 and Ni.…”