Preparation of Acylpentacarbonylchromate Salts and Alkoxycarbene Pentacarbonyl Complexes of Chromium Employing the Pentacarbonylchromate Dianion ([Cr(CO)5]2-)

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Abstract

The in situ generated lithium and sodium salts of [Cr(CO)5]2-(3) react rapidly and cleanly with a variety of aryl and alkyl acid chlorides at -78 °C in THF to provide solutions of the corresponding acylpenta-carbonylchromate salts M′[RC(0)Cr(C0)5] (M′[l], M′ = Li, Na). Subsequent O-methylation of 1 produces Fischer-type alkoxycarbene complexes in yields competitive with established methodologies. This two-step procedure has enabled the preparation of arylmethoxycarbene complexes such as (CO)5Cr=C(OMe)-{2,5·(OAc)2C6H3} (2g) which are otherwise inaccessible by the standard Fischer synthesis. Alkoxycarbene complexes of molybdenum and tungsten may be prepared analogously from [Mo(CO)5]2- and [W(CO)5]2-.

Original languageEnglish (US)
Pages (from-to)1839-1844
Number of pages6
JournalOrganometallics
Volume6
Issue number9
DOIs
StatePublished - Sep 1 1987

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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