Selektive Synthesen mit Organometallen I. Konfigurativ einheitliche Folgeprodukte aus Alkenylkalium-Zwischenstufen
作者:Manfred Schlosser、J�rgen Hartmann、Victor David
DOI:10.1002/hlca.19740570611
日期:——
Methyl groups in positions adjacent to an olefinic double bond can be metalated without cis/trans isomerisation. On the other hand configurational changes can be brought about via metalotropy; under equilibrium conditions the Z isomers (metal cis to an alkyl in β position) predominate overwhelmingly. This behaviour opens new stereoselective routes of high preparative utility.
可以在不进行顺式/反式异构化的情况下金属化与烯属双键相邻的位置中的甲基。另一方面,可以通过同质性引起构型变化。在平衡条件下,Z异构体(在β位置的金属顺式变为烷基)占绝大多数。此行为打开了具有较高制备效用的新的立体选择途径。