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Long‐range 13 C 1 H coupling constants in 3‐carene and α‐pinene
Author(s) -
Denisov Aleksej Y. U.,
Tyshchishin Evgenij A.,
Tkachev Aleksej V.,
Mamatyuk Viktor I.
Publication year - 1992
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260300917
Subject(s) - chemistry , heteronuclear molecule , coupling constant , vicinal , cyclopropane , proton , allylic rearrangement , range (aeronautics) , double bond , camphene , crystallography , computational chemistry , stereochemistry , nuclear magnetic resonance spectroscopy , organic chemistry , ring (chemistry) , physics , nuclear physics , materials science , particle physics , chromatography , essential oil , composite material , catalysis
Long‐range 13 C 1 H coupling constants exceeding 0.3 Hz were measured for the hydrocarbons 3‐carene and α‐pinene by a heteronuclear 2D J ‐resolved proton‐flip experiment with selective proton excitation. The dependences of the vicinal 3 J (C, H) coupling constants on the dihedral angles were studied, and the peculiarities of the couplings through the double bond and cyclopropane framework were demonstrated. The dependences of the 4 J (C, H) coupling constants in the allylic fragments of the molecular framework are discussed, and the long‐range n J (C, H) coupling constants with the olefinic protons in camphene were investigated for the same purpose.