The enthalpies of combustion and formation of [2.2]-paracyclophane and triptycene

The enthalpies of combustion, ΔHoc, for crystalline [2.2]-paracyclophane (C16H16) and triptycene (C20H14) have been measured by oxygen combustion calorimetry. The derived standard enthalpies of formation at 298.15 K in the crystalline state are (34.59±0.19) and (51.87±0.20) kcalth mol-1. The strain present in these molecular systems is discussed.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/33825/1/0000082.pd