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A strong correlation is found between the electronegativity, Ex, and the three proton coupling constant of the vinyl group in over a hundred compounds of the type CH2 = CHX. This correlation extends over the range Ex = 4 to 1 and over the range Jgem + Jcis + Jtrans = 14 to 50 c.p.s. Simple implications and some useful applications of this correlation are discussed.
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Ted Schaefer (1962) studied this question.
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