13C-19F couplings and 19F NMR shifts of cycloalkyl, bicycloalkyl and steroid monofluoro compounds
作者:H.-J. Schneider、W. Gschwendtner、D. Heiske、V. Hoppen、F. Thomas
DOI:10.1016/0040-4020(77)84058-1
日期:1977.1
investigated with 20 alicyclic compounds. One bond couplings, ranging from 168 to 214 Hz, can be represented as a function of the corresponding 13C-H coupling constants. For comparison 13C-1H couplings are determined for norboraane and adamantane and indicate considerable s character at the bridgehead C-H bond of the latter compound. One bond and geminal couplings (ranging from 18 to 24 Hz) are found to
The dominant role of electric field and the questionable role of anisotropy effects of single-bond substituents in proton NMR shifts. Shielding mechanisms of and steric distortions in some monosubstituted steroids