19F Chemical Shifts and Coupling Constants If you have measured a 19F chemical shift and/or coupling constant that does not appear in the tables below, and you would like your measurement to be included here, contact the NMR Facility Staff. Table of Chemical Shift Ranges Type of Compound Chemical Shift Range (ppm) Relative to neat CFCl3 -F-C=O -70 to -20 -CF3- +40 to +80 -CF2- +80 to +140 -CF- ...

31P Chemical Shifts If you have measured a 31P chemical shift and/or coupling constant that does not appear in the tables below, and you would like your measurement to be included here, contact the NMR Facility Staff. Phosphorous (III) Chemical Shift Table (from Bruker Almanac 1991) Compound Chemical Shift (ppm) Relative to 85% H3PO4 PMe3 -62 PEt3 -20 PPr(n)3 -33 PPr(i)3 +19.4 PBu(n)3 -32.5 ...

Scalar coupling constants for biomolecules J-coupling 1J /Hz 1/(2 J) /ms 1/(4 J) /ms Calpha-Halpha 140 3.6 1.8 Cbeta-Hbeta 130 3.8 1.9 Calpha-C' 55 9.1 4.55 Calpha-Cbeta 35 14.3 7.1 Cbeta-Cgamma 35 14.3 7.1 Calpha-N 11 45.5 22.7 Calpha-N (2J) 7 71.4 35.7 N-HN 90 5.55 2.8 N-C' 15 33.3 16.6 N-C' (2J) 1 500 250 Note: These values do not account for relaxation losses and thus do not always ...

CHEMISTRY @CSU Stanislaus CHARACTERISTIC PROTON CHEMICAL SHIFTS Type of Proton Structure Chemical Shift, ppm Cyclopropane C3H6 0.2 Primary R-CH3 0.9 Secondary R2-CH2 1.3 Tertiary R3-C-H 1.5 Vinylic C=C-H 4.6-5.9 Acetylenic triple bond, CC-H 2-3 Aromatic Ar-H 6-8.5 Benzylic Ar-C-H 2.2-3 Allylic C=C-CH3 1.7 Fluorides H-C-F 4-4.5 Chlorides H-C-Cl 3-4 Bromides H-C-Br 2.5-4 Iodides H-C-I 2-4 Alcohols ...