Highly stereoselective synthesis of conjugated polyenes via a homocoupling reaction of unsaturated silanes

被引:56
|
作者
Babudri, F [1 ]
Cicciomessere, AR [1 ]
Farinola, GM [1 ]
Fiandanese, V [1 ]
Marchese, G [1 ]
Musio, R [1 ]
Naso, F [1 ]
Sciacovelli, O [1 ]
机构
[1] UNIV BARI,DIPARTMENTO CHIM,CTR CNR STUDIO METODOL INNOVAT SINTESI ORGAN,I-70126 BARI,ITALY
来源
JOURNAL OF ORGANIC CHEMISTRY | 1997年 / 62卷 / 10期
关键词
D O I
10.1021/jo9700437
中图分类号
O62 [有机化学];
学科分类号
070303 ; 081704 ;
摘要
A new method for the synthesis of conjugated polyenes containing up to eight double bonds with all-E configuration is reported. The procedure is based upon a homocoupling reaction of dienyl-, trienyl-, or tetraenylsilanes, promoted by PdCl2 in methanol and in the presence of LiCl and CuCl2. Configurational and conformational assignments were rigorously made on the basis of NMR spectra. The compounds obtained represent a novel interesting class of symmetrically substituted polyenes with potential optical and electrooptical properties. By changing the solvent, the homocoupling process can be switched to the halogenation of the silyl-substituted terminal double bond, thus leading to polyenyl halides.
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页码:3291 / 3298
页数:8
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