The polymethylene ether derivatives of o,p′-dihydroxydiphenvlacetylene (VIIn, n=7,8,9,10,11 and 12) have been synthesized by the Fritsch-Buttenberg-Wiechell rearrangement. The electronic, infrared, and NMR spectra of VIIn were examined. It was observed that the increasing ring strain had a hypochromic effect, with a hypso-chromic shift of the long-wavelength band in the electronic spectra of VIn making a contrast with the bathochromic shift in the strained p,p′-bridged cyclic tolans.
通过Fritsch-Buttenberg-Wiechell重排反应,合成了o,p'-二羟基二
苯乙炔的多甲撑醚衍
生物(VIIn, n=7,8,9,10,11和12)。研究了VIIn的电子光谱、红外光谱和核磁共振谱。观察到随着环张力的增加,出现了减色效应,与应变p,p'-桥联环托兰的长波带红移相反,VIIn的电子光谱中长波带出现了高色散位移。