High-resolution nuclear-magnetic-resonance spectra of hydrocarbon groupings - V.ABCXspectra of vinyl fluoride and 3-methylbut-l-ene

Abstract
Some general properties ofABCX-type spectra are discussed. It is shown that it is possible to deduce from such spectra the relative signs of all inter-nuclear coupling constants. Analyses are presented of the hydrogen (proton) spectra from the vinyl groups of vinyl fluoride and 3-methylbut-l-ene, and of the fluorine spectrum of the former molecule. It is shown that all HF coupling constants in vinyl fluoride are of the same sign as thecisandtransHH coupling constants.

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