A catalytic process for hydrophosphonylation of aldehydes with H6P2W18O62•14H2O has been developed in this paper. Various aldehydes were reacted with diethylphosphite in the presence of 1 % of heteropolyacids (HPAs) as a catalyst to generate the α-hydroxyphosphonates. All the synthesized compounds were systematically characterized by IR, 1H NMR, 13C NMR, and 31P NMR.
The inhibition effect of the grape pomace extract during the early stage of steel corrosion under adsorbed thin electrolyte layers was investigated. The present study was carried out to identify the components present in the 2-propanol grape pomace extract by GC-MS analysis. Gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization, scanning electron microscopy, and FTIR techniques were used to study the corrosion inhibitive. Polarization measurements have indicated that these green inhibitors acted through mixed type inhibition.
We have synthesized and tested a new binol-aldehyde compound 1, against five diamine compounds. Using 1H NMR (400 MHz) spectroscopy, stable diasteriomeric imine complexes between 1 and five diamines were formed. Chemical shift nonequivalences (up to 0.058 ppm) were obtained for imines. Linear calibration plot was obtained for determining the enantiopurity of diamines.