(η-Cycloheptatriene)- and (η-cycloheptatrienylium)-(η-cyclopentadienyl)manganese. Formation of cyclic triene complexes by photochemical displacement of three carbonyl groups from tricarbonyl-(η-cyclopentadienyl)manganese
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 22,p. 2387-2392
- https://doi.org/10.1039/dt9750002387
Abstract
Cycloheptatrienes react photochemically with tricarbonyl(η-cyclopentadienyl)manganese or its derivatives to give neutral diamagnetic (η-cycloheptatriene)(η-cyclopentadienyl)manganese compounds via dicarbonyl(1–2-η-cycloheptatriene) intermediates. Trityl salts convert the cycloheptatriene derivatives into (η-cycloheptatrienylium)-(η-cyclopentadienyl) manganese salts which may be reduced back by lithium tetrahydridoaluminate. 7-Substituted cycloheptatrienes yield predominantly the exo-substituted complexes which resist such hydride abstraction but are convertible into other isomers by hydrogen migration on heating. (η-Cyclo-octatriene)- and (1–6-η-cyclo-octa-tetraene)-(η-cyclopentadienyl)manganese may be obtained similarly but are much less stable than their cycloheptatriene analogues.Keywords
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