Acta Phys. -Chim. Sin. ›› 1997, Vol. 13 ›› Issue (03): 274-277.doi: 10.3866/PKU.WHXB19970317

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A Polarity Modification of Benson's Group Additivity Method

Wang Gui-Chang,Cai Zun-Sheng,Gao Qing-Yu,Zhao Xue-Zhuang   

  1. Chemistry Department of Nankai University,Tianjin 300071
  • Received:1996-06-24 Revised:1996-10-30 Published:1997-03-15
  • Contact: Zhao Xue-Zhuang


An empirical method for estimating the standard enthalpy of some polar compounds is presended in this paper, that is
△△fH°(RX/CH3X)= △fH°(RX)- △fH°(CH3X)=a+bIx
where △△fH°(RX/CH3X) represents the standard enthalpy difference between CH3-X and R-X(R=Et, i-Pr, t-Bu, etc). It is a new polarity parameter defined by us. A good result was obtained for nearly 70 polar compounds.

Key words: Standard enthalpy, Polarity parameter, Correlate, Estimate, Polar organic compound