Reactivity of carbanions of Fischer-type carbene complexes with pyrylium salts.: Synthesis and characterization of new γ-methylenepyran carbene complexes via an addition-oxidation-deprotonation process

被引：18
|
作者：
Caro, B
Le Poul, P
Robin-Le Guen, F
Saillard, JY
Kahlal, S
Moinet, C
Le Poul, N
Vaissermann, J
机构：
[1] CNRS, Lab Chim Organomet & Biol, UMR Organomet & Catalyse 6509, IUT Lannion, F-22300 Lannion, France
[2] Univ Rennes 1, Lab Solide & Inorgan Mol, UMR 6511, CNRS, F-35042 Rennes, France
[3] Univ Rennes 1, UMR 6509, CNRS, F-35042 Rennes, France
[4] Univ Exeter, Sch Chem, Exeter EX4 4QD, Devon, England
[5] CNRS, Chim Met Transit Lab, F-75252 Paris 05, France
来源：
TETRAHEDRON | 2002年 / 58卷 / 37期
关键词：
pyrylium salts; methylenepyran Fischer-type carbene complexes; tungsten and chromium carbenes; DFT calculations;
D O I：
10.1016/S0040-4020(02)00800-1
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
The condensation reaction between gamma-unsubstituted pyrylium salts and carbanions of Fischer-type carbene complexes allowed the synthesis of new gamma-methylenepyran carbene complexes. NMR data, single crystal X-ray analysis, and DFT calculations suggest that these complexes have a partial pyrylium character due to the pi electron-accepting ability of the carbenic fragment and to the electron-releasing properties of the methylenepyran part. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码：7519 / 7530
页数：12
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