An efficient triphenylphosphine oxide-catalyzed amidation and esterification for the rapid synthesis of a series dipeptides, amides, esters is described. This reaction applicable to challenging couplings hindered carboxylic acids with weakly nucleophilic amines or alcohols, giving products in good yields (67–90%) without racemization. system employs highly reactive intermediate Ph3PCl2 as activ...

N, N'-oxalyl bis(piperonylic acid) dihydrazide (PAOD) was obtained through the amination of piperonylic acid chloride and its structure characterized by Fourier transform infrared spectrometer nuclear magnetic resonance. Melting blend technology used to prepare modified poly(L-lactic (PLLA) containing various loading PAOD as a new organic nucleating agent. The thermal performances including cry...