The mechanisms of long-range 13C, 19F and 19F, 19F coupling constants in derivatives of biphenyl and fluorene. Differential isotope shifts

T Schaefer, J Peeling…

文献索引：Schaefer, Ted; Peeling, James; Penner, Glenn H. Canadian Journal of Chemistry, 1986 , vol. 64, p. 2162 - 2167

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被引用次数: 13

摘要

13C, 19F and 19F, 19F nuclear spin-spin coupling constants over n formal bonds, n= 1-9, are reported for 4-fluorobiphenyl, 4, 4'-difluorobiphenyl, 4, 4'-difluoro-2, 2', 6, 6'- tetramethylbiphenyl, 2, 7-difluorofluorene, 2-fluoro-9-fluorenone, and 2, 7-difluoro-9- fluorenone in acetone solutions. The signs of many of the coupling constants are deduced from second-order spectral phenomena caused by differential 13C isotope effects on the ...