Preparations and properties of pseudo-geminal ketones of tris-[2.2.2]- and tetrakis[2.2.2.2]parazylylene
作者:I. Tabushi、Z. Yoshida、F. Imishiro
DOI:10.1016/0040-4020(75)87036-0
日期:1975.1
Pseudo-geminal bridged ketones of tris[2.2.2]paraxylylene, 1, and of tetrakis[2.2.2.2]paraxylylene, 2, were prepared and their spectral properties were investigated in comparison with those of dibenzosuberone, 3. The CO stretching band of 1 was observed at abnormally high frequency region (by ca. 50 cm−1) compared with that of 3, while that of 2 was at a position similar to that of 3. The electronic
制备了三[2.2.2]对亚二甲苯基1和四[2.2.2.2]对亚二甲苯基2的假基因桥联酮,并与二苯并亚砜3进行了比较,研究了其光谱性质。的CO伸缩的带1在异常高的频率区域中观察到(通过约50厘米-1)与比较3,而的2是在类似于的位置3。电子光谱1表明,由于CO和芳烃之间缺乏共面性,因此1具有极大的共轭损失。H 0的化学位移,邻位到CO,的1也支持这一结构特征。