Abstract
1. The13C NMR spectra of the acetylene derivatives of group IVB elements have been studied for the first time. Analysis of the13C chemical shifts indicates that the triple bond of these compounds interacts with the immediately adjacent IVB elements through dπ-pπ conjugation. 2. The dπ-pπ mechanism is ineffective in triple bond interaction with phenyl and vinyl fragments, and in interactions between the substituents themselves, and this despite the fact that the -CH2R substituent has a marked effect on the shielding of the13C nucleus, in the methylene group and in the triple bond. 3. Substituents containing Si, Sn, or Ge have much the same effect on the sp-carbon atom shielding.
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