Phosphahydroquinones and oxaphospholes via carbene annulation and cycloaddition reactions of chromium carbonyl carbene complexes and phosphaalkynes
1993; Elsevier BV; Volume: 49; Issue: 25 Linguagem: Inglês
10.1016/s0040-4020(01)87270-7
ISSN1464-5416
AutoresKarl Heinz Dötz, Athanassios Tiriliomis, Klaus Harms,
Tópico(s)Organometallic Complex Synthesis and Catalysis
ResumoFischer-type alkoxy(aryl or vinyl)carbene complexes of chromium undergo regiospecific carbene annulation and cycloaddition upon reaction with tert.butyl phosphaacetylene to give highly substituted phosphahydroquinones and/or oxaphospholes. The product distribution is governed by steric and electronic effects arising from the substitution pattern in the carbene ligand. The phosphaannulation products such as phosphabenzene, -naphthalene, -benzofuran, -benzothiophene and -phenanthrene skeletons as well as the 1,3-oxaphospholes are obtained in yields up to 89% and - in part - are characterized by X-ray diffraction.
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