Allylation of Quinones via Photoinduced Electron-Transfer Reactions from Allylstannanes
作者:Kazuhiro Maruyama、Hiroshi Imahori
DOI:10.1246/bcsj.62.816
日期:1989.3
Photochemical reactions of quinones with allylstannanes provided four types of products: adducts of allyl group to the carbonyl oxygens of quinones, adducts of allyl group to the olefinic carbons, adducts of allyl group to the carbonyl carbons, and hydroquinones. An electron-transfer mechanism was confirmed by 1H-CIDNP (Chemically Induced Dynamic Nuclear Polarization) method. This study suggests that
醌与烯丙基锡烷的光化学反应提供了四种类型的产物:烯丙基与醌的羰基氧的加合物、烯丙基与烯烃碳的加合物、烯丙基与羰基碳的加合物和对苯二酚。通过1H-CIDNP(化学诱导动态核极化)方法证实了电子转移机制。该研究表明 a) 从烯丙基锡烷到醌的光致电子转移产生相应的醌阴离子自由基和锡阳离子自由基,b) 锡阳离子自由基裂解产生烯丙基自由基和锡阳离子,以及 c) 烯丙基自由基攻击醌阴离子自由基导致最终产物烯丙基化醌的形成。
Metathetic approach towards macrocyclic<i>bis</i>-ethers and in sequence use of barbier reaction and RCM for spirocyclic ethers
作者:Sulagna Brahma、Susama Maity、Jayanta K. Ray
DOI:10.1002/jhet.5570440105
日期:2007.1
An efficient method for the synthesis of novel macrocyclic bis-ethers from alizarin and also some new spiro ethers from various substituted ketones by the use of Barbier and ring-closing metathesis (RCM) reactions has been developed.