Interactions of phosphoryl bonds with unsaturated system. I. Structure of (E)-diphenyl-3-oxo-butenyl-phosphine oxide

The crystal and molecular structure of (E)-diphenyl-3-oxo-butenylphosphine oxide C

Interactions of phosphoryl bonds with unsaturated system*. II. Structure of (E)-dibenzyl-3-oxo-3-methoxypropenylphosphine oxide

The crystal and molecular structure of (E)-dibenzyl-3-oxo-3-methoxypropenylphosphine oxide C

A contribution to mechanism of addition of hydrogen bromide to the α,β-unsaturated system of 3-phenyl-2-propenoic acid

Rate of addition of hydrogen bromide to meta- and para-substituted 3-phenyl-2-propenoic acids I was followed by polarography and UV spectroscopy. Rate of protonation either is the overall rate determining step or is at least comparable with the rate of the subsequent nucleophile attack.