作者:William E. Allen、Christopher J. Fowler、Vincent M. Lynch、Jonathan L. Sessler
DOI:10.1002/1521-3765(20010202)7:3<721::aid-chem721>3.0.co;2-1
日期:2001.2.2
2,2'-Biimidazoles were synthesized by palladium(0)-catalyzed coupling of 2-iodoimidazoles bearing an alkyl and an ester group at the 4- and 5-positions, respectively. The products were found to be fluorescent and moderately soluble in organic solvents. Three biimidazoles were subjected to single crystal X-ray diffraction analysis. In all three instances, adjacent molecules were found to be bound together
通过钯(0)催化分别在4位和5位带有烷基和酯基的2-碘咪唑的偶合反应合成2,2'-苯并咪唑。发现产物是荧光的,并适度溶于有机溶剂。对三种联咪唑进行单晶X射线衍射分析。在所有这三种情况下,都发现相邻的分子通过成对的NH ... N氢键结合在一起,形成类似于双螺旋的扭曲的带状柱。在这些螺旋中,相邻的联咪唑亚基之间观察到的螺旋扭曲量随烷基和酯基的不同而不同。在两种情况下约为60度,而在第三种情况下约为90度。六种不同的联咪唑的质谱显示出质量与二聚体相对应的离子。这表明这些化合物在气相中彼此保留一定的亲和力。三种最易溶解的联咪唑也显示归因于三聚体和四聚体的质谱峰。通过蒸气压渗透法研究了后三种化合物的溶液相聚集趋势。在每种情况下,在1,2-二氯乙烷溶液中的表观分子量均高于游离单体的预期分子量。