A bis(boronate) compound (1) in which boronate components are situated on the same side of the planar s-indacene framework is synthesized from 1,5-dihydro-1,1,5,5-tetramethyl-s-indacene by OsO4-catalyzed dihydroxylation in the presence of dihydroxyphenylborane. The property of 1 as a host molecule has been examined with various compounds. The host 1 forms a 1 : 1 complex with 4-dimethylaminopyridine (DMAP) when an equimolar amount of DMAP is added; more concave-type complexes (2) are formed than convex-type complexes (3). When excess amounts of DMAP are present, a 1 : DMAP = 1 : 2 complex (4) can be isolated as a single crystal. This complex can be characterized by NMR measurements and X-ray analyses. These analyses indicate that the concave-type complex 2 does not have a bidentate coordination between the two boron–nitrogen atoms as proposed previously, but has a monodentate coordination form.
一种双(
硼酸盐)化合物(1)被合成,其中
硼酸盐部分位于平面s-引达省框架的同一侧,合成方法是通过在二羟基苯
硼烷的存在下,由1,5-二氢-1,1,5,5-四甲基-s-引达省经OsO4催化的二羟基化反应。化合物1作为主体分子与各种化合物的性质已被检验。主体1与等摩尔量的4-二甲
氨基吡啶(
DMAP)形成1:1的复合物;凹型复合物(2)的形成比凸型复合物(3)更多。当存在过量的
DMAP时,可以分离出1:
DMAP=1:2的复合物(4)作为单晶。这个复合物可以通过NMR测量和X射线分析来表征。这些分析表明,凹型复合物2没有像先前所提出的那样在两个
硼–氮原子之间形成双齿配位,而是具有单齿配位形式。