THERMOCHEMICAL PROPERTIES OF POLYCYCLIC-HYDROCARBONS INCLUDING FRAGMENTS OF NORBORNANE AND SMALL CYCLES

Combustion enthalpies of three polycyclic hydrocarbons were measured b y the precision bomb calorimetry method and their enthalpies of format ion in the liquid state were calculated: for pentacyclo[6.3.1.1(3,6).0 (2,7).0(9,11)]tridecene, -7713.9+/-3.8 and 25.8+/-3.8 kJ mol(-1): for lpentacyclo[6.3.1.1(3,6).0(2,7).0(9,11)]tridecene, -8348.8+/-3.9 and - 18.7+/-3.9 kJ mol(-1): and for ).0(2,7).0(9,12)]tetradecene-10-spirocy clopropane, -10157.9+/-3.4 and 38.1+/-3.8 kJ mol(-1). The thermochemic al parameters obtained agree with calculated values as well as with ex perimental and calculated enthalpies of formation of some hydrocarbons that contain the same fragments as the compounds studied.