Structures of Three Isomeric Dimers of 2,4,5-Triphenylimidazolyl
Structures of Three Isomeric Dimers of 2,4,5-Triphenylimidazolyl
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2,4,5-三苯基咪唑基的三个异构二聚体的结构
DOI：
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发表时间：
1972
期刊：
影响因子：
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通讯作者：
T. Goto
中科院分区：
文献类型：
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作者：
H. Tanino;T. Kondo;K. Okada;T. Goto
除了压致变色和光致变色的2，4，5-三苯基咪唑二聚体（二聚体A）外，还制备了两种新的同分异构二聚体：一种（二聚体B）是光致变色的，另一种（二聚体C）是非光致变色的。还制备了几种二聚体的p-取代衍生物。通过比较它们的NMR和IR光谱，结构（a）、（B）和（c）分别归属于二聚体A、B和C。用盐酸乙醇溶液处理时，二聚体A发生异裂，得到2-乙氧基-2H-和4-乙氧基-4H-2，4，5-三苯基异咪唑和2，4，5-三苯基咪唑的混合物。
In addition of the piezochromic and the photochromic (dimer A) dimers of 2,4,5-triphenylimidazolyl, two new isomeric dimers were prepared; one (dimer B) being photochromic and the other (dimer C) non-photochromic. Several p-substituted derivatives of the dimers were also prepared. By comparison of their NMR and IR spectra, structures (a), (b), and (c) were assigned to the dimers A, B, and C, respectively. On treatment with hydrochloric acid in ethanol, dimer A underwent heterolytic cleavage and gave a mixture of 2-ethoxy-2H- and 4-ethoxy-4H-2,4,5-triphenylisoimidazole, and 2,4,5-triphenylimidazole.