1,4- to 1,5-Homologation of Alkene−Carbene and Alkyne−Carbene Complexes of Chromium and Tungsten: The Clue to Reactivity
✍ Scribed by Rudler, Henri; Parlier, Andrée; del Pilar Peregrina, Maria; Vaissermann, Jacqueline
- Book ID
- 126116803
- Publisher
- American Chemical Society
- Year
- 2005
- Tongue
- English
- Weight
- 136 KB
- Volume
- 24
- Category
- Article
- ISSN
- 0276-7333
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📜 SIMILAR VOLUMES
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
Dedicated to
the line-shape changes allow the detection of two different dynamic processes, which may be assigned to inhibited rotations about the partial C C and C N double bonds of the E-isomers (Scheme 2). Above ca. 0°C conversion into the isomer with Z-configurated CC double bond, which contains an intramol