Spontaneous resolution versus formation of racemic crystals of indenylpotassium complexes
作者:Susanne Olsson、Anders Lennartson、Mikael Håkansson
DOI:10.1016/j.jorganchem.2013.05.045
日期:2013.10
reagents, we found that crystallisation of [K(ind)(pmdta)]n (ind = indenyl, pmdta = N,N,N',N'',N''-pentamethyldiethylenetriamine) from tetrahydrofuran (THF) gave rise to three different crystalline phases depending on the concentration. The more concentrated solutions gave racemic crystals of the previously known coordination polymer [K(ind)(pmdta)]n, α-1. More dilute solutions gave crystals of a new
在对立体化学不稳定的有机金属试剂的研究中,我们发现从四氢呋喃中结晶出[K(ind)(pmdta)] n(ind =茚基,pmdta = N,N,N',N'',N'' -五甲基二亚乙基三胺)。 (THF)根据浓度产生三个不同的结晶相。浓度更高的溶液得到先前已知的配位聚合物[K(ind)(pmdta)] n,α-1的外消旋晶体。更多的稀溶液产生了新相的结晶,β-1,它被发现会自发地解决。从甚至更多的稀溶液中,我们能够分离出具有THF 2的手性包合物,该化合物也经历了自发的拆分。β-1和2的晶体是对映体纯的,并且由于β-1是反应性有机金属试剂,因此尝试将晶体用于对映选择性合成。单晶与N-氯代琥珀酰亚胺反应生成手性1-氯茚,但未观察到对映体过量。