Sign and magnitude of 1K(Sn–C) in trimethylstannyl-lithium: the first example of a negative reduced nuclear spin–spin coupling constant between two directly bound Group IV elements
Abstract
The electron-mediated reduced nuclear spin–spin coupling constants 1K(Sn–C) and 2K(Sn–H) are negative and positive respectively in trimethylstannyl-lithium; this is attributed to the presence of a lone pair of electorns on the tin atom.