Deprotonation mechanism of new antihypertensive piperidinylmethylphenols: a combined experimental and theoretical study.

Four new antihypertensive piperidinylmethylphenol compounds were synthesized for their potential antihypertensive and antiarhythmic properties. The pKa values were determined experimentally, with the aid of the program SQUAD, by capillary zone electrophoresis (CZE) at T=298.15 K and 0.015 M ionic strength (I=0.05 M) and by UV spectrophotometry at pseudophysiological conditions (T=310.15 K and I=0.15 M), obtaining good agreement between the values determined with both techniques. A theoretical study was followed in order to propose a deprotonation mechanism for each compound.