Acta Chimica Sinica ›› 1981, Vol. 39 ›› Issue (6): 485-492.     Next Articles

键能的研究——马尿酸、哌嗪、氮七环燃烧热的测定

安绪武, 张中良, 王水哖, 阎俊青, 胡日恒   

  1. 中国科学院化学研究所 北京
  • 收稿日期:1979-10-05 出版日期:1981-11-15 发布日期:2013-06-03

INVESTIGATION ON BOND ENERGIES: THE HEAT OF COMBUSTION OF HIPPURIC ACID, PIPERAZINE AND AZACYCLOHEPTANE

AN XU-WU, ZHANG ZHONG-LIANG, WANG SHUI-NIAN, YAN JUN-QING, HU RI-HENG(HU JIH-HENG)   

  1. Institute of Chemistry, Academia Sinica, Beijing
  • Received:1979-10-05 Online:1981-11-15 Published:2013-06-03

The beats of combustion for(1) hippuric acid(c),(2) piperazine(c)and(3) azaeycloheptane(1) wore dotormined using a precision bomb calorimeter.The results of △H-o and △H0f are:(1)-1008.30±0.22;(2)-707.79±0.27,-9.99±0.27 and(3)-987.03±0.39,-21.36±0.39 kcal/mol,respectively.Using values of latent heat from literature or by estimation,△H0f valuos of these two cyclic compounds wore derived.According to the bond energy achomo,tho conventional ring strain energies for these compounds are estimated to be(2)-0.2±1.5 and(3)+5.6±0.4 kcal/mol,respectivoly,and comparison with thoso of other cyclic compounds is made.