Abstract
By means of 13C NMR spectroscopy, the coupling constants 1 J( 119Sn 13C Et) of 18 compounds of the SnEt 3R type (R = organo group) have been measured. These coupling constants have been shown to reflect the change induced by R in the s-content of the tin hybrid orbitals of the SnC Et bonds. The series of the influence of R obtained on the basis of the coupling constant mentioned as a parameter is compared with a trans-influence series of R obtained on organo-mercury compounds. Occurring differences are attributed to different modes of bonding of the group R at the central atom.
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