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根据~1H NMR,同核自旋去偶和二维COSY(400MHZ)的实验结果,对四种2,2′-二取代-1,1~1-联萘化合物的萘环质了作了归属指定,指出联萘酚的H_8(H’_8)共振峰应在高场,不宜接 Sadtler标准谱图指定在低场。讨论了萘环环电流各向异性和二萘环平面二面角对萘环质子的影响。当萘环二面角变化时,H_8(H’_8)受到的影响最大,随着二面角减小,H_8(H’_8)的共振明显地移向低场。
According to the experimental results of ~ 1H NMR, homonuclear spin-dip and two-dimensional COZY (400MHZ), the naphthalene rings of four 2,2’-disubstituted-1,1,1-binaphthalene compounds were assigned It is pointed out that the H_8 (H’_8) resonance peak of binaphthol should be in the high field and should not be assigned to the Sadtler standard spectrum in the low field. The effects of naphthalene ring current anisotropy and naphthalene ring protons on the planar dihedral angle of dinaphthalene ring are discussed. The H_8 (H’_8) is the most affected when the dihedral angle of naphthalene ring is changed. As the dihedral angle decreases, the resonance of H_8 (H’_8) obviously moves to the lower field.