Of metal-containing heterocycles

Crude oil consists mainly of a mixture of paraffinic, naphthenic, and aromatic hydrocarbons with small amounts of metals-containing heterocyclic compounds. The most abundant metals found in oils are those contained in porphyrin or porphyrin-like complexes (nickel, copper, iron, and vanadium). These... 

The chemistry of metal-containing heterocycles has developed enormously during the last few years. The present review therefore can only deal with compounds that have at least one metal-carbon a bond. This study is focused on metallacycloalkanes and -alkenes without and with additional heteroatoms, which are of increasing interest because they occur in many transition metal-catalyzed organic syntheses as highly reactive intermediates. 

Lindner E, Kehrer U, Steimann M, Strobele M. 2001. Preparation, properties, and reactions of metal containing heterocycles part cv. Synthesis and structure of polyox adiphosphaplatinaferrocenophanes. J Organomet Chem 630 266 274. 

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See also in sourсe #XX -- [ , , , , ]

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