Facile insertion of nitriles into paramagnetic chromium(III) alkyls. Crystal structure of a .mu.2-ketimino complex
Facile insertion of nitriles into paramagnetic chromium(III) alkyls. Crystal structure of a .mu.2-ketimino complex
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轻松将腈插入顺磁性烷基铬(III)中。
DOI：
10.1021/ja00253a059
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发表时间：
1987
影响因子：
15
通讯作者：
K. Theopold
中科院分区：
文献类型：
--
作者：
D. Richeson;John F. B. Mitchell;K. Theopold
烯基环硼嗪是特别重要的，因为可以将这些化合物转化为类似于例如聚苯乙烯的聚合硼-氮材料。这样的聚合物可用于氮化硼陶瓷的形成，16-21以相同的方式，有机硅聚合物已被发现是碳化硅的前体。19，22，23之前已经报道了环硼氮烷的几种烯基取代的衍生物; 24-26然而，在大多数情况下，必须用烷基封闭剩余的环氮和硼位置。这导致对聚合的空间排斥17并降低这些聚合物中的BN/C比率。本文报道的合成方法在一步反应中以高产率产生母体化合物。此外，我们已经观察到，当反应在更强制的条件下进行时，可以获得二-B-烯基产物。
Alkenylborazines are of particular importance since it may be possible to convert these compounds to polymeric boron-nitrogen materials analogous to, for example, polystyrene. Such polymers may then be useful for the formation of boron nitride ceramics, 16-21 in the same way that organosilicon polymers havebeen found to be precursors to silicon carbide. 19, 22, 23 Several alkenyl-substituted derivatives of borazine have previously been reported; 24-26 however, it has been necessary in most cases to block the remaining ring nitrogen and boron positions with alkyl groups. This results in steric repulsion to polymerization17 and lowers the BN/C ratios in these polymers. The synthetic method reported herein yields the parent compounds in high yields in a one-step reaction. Furthermore, we have observed that when reactions are carried out under more forcing conditions di-B-alkenyl products can be obtained.