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1,2 and 1,6 Additions of Lithium Reagents to γ-Methylenepyran Fischer-Type Carbene Complexes; Evolution of the 1,2 and 1,6 Adducts to Unsaturated Carbene Complexes Indirectly Stabilized by a Heteroatom, and to Pyranylidene Carbene Complexes

✍ Scribed by Bertrand Caro; Pascal Le Poul; Françoise Robin-Le Guen; Marie-Claude Sénéchal-Tocquer; Jean-Yves Saillard; Samia Kahlal; Lahcène Ouahab; Stéphane Golhen

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 282 KB
Volume: 2000
Category: Article
ISSN: 1434-193X
DOI: 10.1002/(sici)1099-0690(200002)2000:4<577::aid-ejoc577>3.0.co;2-2

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✦ Synopsis

1,2 and 1,6 additions of lithium reagents to γ-methylenepyran Fischer-type carbene complexes are described. The 1,2 adducts obtained from alkynyllithium addition evolve by a 1,3 shift of the W(CO) 5 fragment to give allenyltungsten carbonyl intermediates. Reaction with degassed water affords