HYDROACRIDINES .15. THERMODYNAMIC STUDY O N SOME NORMOALKYL DERIVATIVES OF TRANS,SIN,TRANS-TETRADECAHYDROACRIDINE AND TRANS,ANTI,CIS-TETRADECAHYDROACRIDINE

The thermodynamic study of (4a alpha, 8a beta, 9a beta, 10a alpha)-tet radecahrdro-10-methyl-acridine (I),(4a alpha, 8a beta, 9a beta, 10a al pha)-10-ethyl-tetradecahydroacridine(II), (4a alpha, 8a alpha, 9a beta , 10a alpha)-tetradecahydro-10-methyl-acridine(III) and (4a alpha 8a a lpha, 9a beta, 10a alpha)-10-ethyl-tetradecahydroacridine(IV) in conde nsed stale has been performed by combustion calorimetry of small amoun ts of substance and by sublimation calorimetry using a CRMT and Tian-C alvet calorimeter, respectively. Enthalpies of combustion and sublimat ion art experimentally determined. The formation enthalpies in solid a nd gaseous stales were calculated. These energetic values were used fo r the determination of isomerisation energies between different stereo isomers and also for the atomization energies of thr studied molecules . The saturated vapour pressures of these four compounds have been est imated.