S. Haindl, Jiayi Xu, Tyll Freese
Dec 8, 2016
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0
Influential Citations
6
Citations
Journal
Tetrahedron
Abstract
Abstract The anion of 2-ethynyl-1-methylpyridinium salts, which polymerized rapidly, can be represented as the mesomeric betaine 1-methylpyridinium-2-acetylide or as the cumulene-type structure 1-methylpyridin-2-allenylidene. Palladium complexes have been prepared starting from 2-ethynylpyridine and Pd(PPh 3 ) 4 or PdCl 2 (PPh 3 ) 2 followed by methylation of the resulting complexes to the title compounds. Results of calculations and spectroscopic measurements are discussed with respect to the zwitterionic or allenylidene resonance forms.