Multiple Bonds between Main-Group Elements and Transition Metals, 140. Cycloaddition Reactions of Methyltrioxorhenium(VII): Diphenylketene and Sulfur Dioxide

Wolfgang A. Herrmann, Peter W. Roesky, Wolfgang Scherer, Matthias Kleine

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Abstract

Complexation of methyltrioxorhenium(VII) (MTO; 1) with mono- and bidentate nitrogen bases facilitates, O,O′-cycloaddition reactions of this compound. bpy·CH3ReO3 (2; bpy = 4,4′-di-tert-butyl-2,2′-bipyridine) and py·CH3ReO3 (3; py = 4-tert-butylpyridine) thus react with the heterocumulenes diphenylketene and SO2 in regioselective cycloadditions at the O=Re=O fragment, resulting in the new metallacyclic compounds (bpy)CH3Re(=O)[η2-O2C(=O)CPh2] (4a), (py)2CH3Re(=O)[η2-O2C(=O)CPh2] (6) and (bpy)CH3Re(=O)(η2-O2So2) (7). Metallacycles of this type are independently accessible from (bpy)CH3Re(=O)Cl2 (5). A single-crystal X-ray diffraction study of 4a documents the regioselectivity of cycloaddition (crystal data: space group P1, a = 1195.1(3) pm, b = 1380.0(3) pm, c = 1391.3(2) pm, α = 67.00(2)°, β = 77.91(1)°, γ = 73.17(1)°, Z = 2).

Original languageEnglish
Pages (from-to)4536-4542
Number of pages7
JournalOrganometallics
Volume13
Issue number11
DOIs
StatePublished - 1 Nov 1994

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