Standard enthalpies of formation of some phenyl derivatives of cyclopropene

Abstract

The energies of combustion of crystalline 1-methyl-2,3,3-triphenylcyclopropene (C22H18), methyl2,3-diphenylcycloprop-2-ene-1-carboxylate (C17H14O2) and 1,2,3-triphenylcyclopropene (C21H16), were determined in isoperibolic calorimeter at T = 298.15 K. The enthalpies of sublimation were measured by isothermal heat-conducting differential microcalorimeter (“Setaram”) at T = 298.15 K. The enthalpies of formation in the crystalline and gaseous states were calculated. The values of enthalpies of three group contributions: [C-(Cd)2(Cb)2], [C-(Cd)2(CO)(H)] and [C-(Cd)2(Cb)(H)], which absents in the Cohen additive scheme, were estimated.