Novel Substituent Effect on <sup>77</sup>Se NMR Chemical Shifts Caused by 4c-6e versus 2c-4e and 3c-4e in Naphthalene Peri Positions: Spectroscopic and Theoretical Study
作者:Satoko Hayashi、Warô Nakanishi
DOI:10.1021/jo9903860
日期:1999.9.1
-(B)SeH(2) (4 and 5: models of Se(2) pi type 2c-4e and (A)Se- - -(B)Se-H 3c-4e for 2, respectively) with the 6-311+G(2d,p) basis sets at B3LYP and/or HF levels. The characteristic nature of the substituenteffects on atomic charges and delta(Se) values in 3 is demonstrated to be Y(delta-)<--C(6)H(4)-Se(delta)(+)- - -Se(delta)(+)-Se(delta)(+)- - -Se(delta)(+)-C(6)H(4)-->Y(delta-) and Y(delta-)<--C(6)H(4)-Se(down)-