Differential thermal analysis (DTA) measurements under pressure up to 300 MPa and temperatures of about 300 to 370 K have been performed on cyclohexanone-d(10), bromocyclohexane and metatoluidine. The p-T-phase diagrams of these compounds have been established. Cyclohexanone-d(10) exhibits the same sequence of phases as cyclohexanone-h(10); however, the solid III-II and solid II-I transitions are separated at normal pressure. For bromocylohexane no solid-solid transitions have been found in the range of the pressures studied. Metatoluidine shows a glass transition. The slopes dT/dp of the phase transition lines have been determined and are used to calculate the volume changes with the aid of the Clausius-Clapeyron equation.