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Abstract
A mixture of 1,2- and 2,5-dihydropyridines and 5-isopropylidene-2,5-dihydropyridine, obtained from 1-(methoxycarbonyl)-1,2-dihydropyridine and methyllithium followed by protonation, reacts with a series of pentacarbonyl tungsten(0) alkoxycarbene complexes to afford, besides the expected pyridinium ylide complexes 7, the 2,5-dihydropyridinium ylide complexes 6 together with the 5-isopropylidene-2,5-dihydropyridinium ylide complexes 5, which could be separated and fully characterized by X-ray analysis.
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