| NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY. LONG-RANGE SPIN COUPLINGS IN VINYLACETYLENE (2005) | |||||||||
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| Theoretical couplings discussions must take into account the fact that the couplings are by no means negligibly small. This is clearly illustrated by the n.m.r. spectrum of the acetylenic proton of vinylacetylene in benzene solution under very high resolution. The couplings which correspond to the observed splittings are J sub 13 = -2.40 cps, J sub 14 (cis) = 0.80 cps, and J sub 14 (trans) = 1.00 cps (all ! 0.1 cps) for vinylacetylene. (The signs of the J values are relative to positive signs being taken for the couplings within the vinyl group.) The reality of the long-range couplings in vinylacetylene was further confirmed beyond question by the proton spectrum of deuterated vinylacetylene, which substance showed the calculated simplification of the vinyl resonances expected for reduction of the magnitude of t e relevant couplings by a factor of seven (the H to D gyromagnetic ratio). (Author) | |||||||||
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