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It is demonstrated that some acetylenes, those of the RCCH structure, display anomalously high sensitivity to solvent effects of their 1J(CC) coupling while RCCR acetylenes fail to show that. The solvent‐induced variation in the latter coupling does not exceed 3 Hz; this seems to be the upper limit of variation of any J(CC) and J(CH) coupling in the molecular system studied which included: acetylene...
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