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A Synthesis and Multinuclear NMR Study of New β -Phosphorus Ylides and Their Palladium (II) Complexes

A one-step synthesis of sterically congested phosphorous ylides in moderate-to-good yields by the reaction of CH-acids (Acetylacetone and diethyl malonate), dimethyl acetylenedicarboxylate, and tri-p.tolylphosphine and their palladium (II) complex is reported. The structures of this compound were confirmed by IR and 1 H, 31 P, 13 C NMR spectroscopy and elemental analysis. The NMR spectra showed that each of these compounds (in CDCl 3 as a solvent) contained two rotamers and diastereoisomers with unequal population.