SPIN COUPLING CONSTANTS FOR CC BONDS

Abstract

Molecules possessing various types of CC bonds have been enriched with $C^{18}$ and spin coupling constants of $C^{13} C^{13}$ bonds have been obtained. Values for single bonds of the type $spa-sp$a, $sp^{3}-Sp^{3}, sp^{8}-sp$, and for the double and triple bonds have been derived. The relation of the magnitude of the spin coupling with percent s character is discussed.