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1·The states of active hydrogens, the hindered rotation within molecules and the kinetic phenomena of tautomerism have also been discussed.

还对分子内的受阻旋转、活泼氢状态以及互变异构体的动力学现象作了讨论。

2·It was also shown that the hindered rotation of 4-phenyl in the molecule of 2, 4, 6-triphenyl pyrylium salt is unfavorable to its fluorescence emission.

实验结果还表明，4 -位取代苯基旋转受阻对化合物的荧光发射不利。