【摘要】 定义了拓扑指数Ｓｉ（ｉ＝１，２，３，４），并选取包含双、三键、环及苯环的碳氢化合物为研究对象，计算了这些化合物的拓扑指数Ｓｉ，同时用Ｓｉ相关了它们的沸点．结果较文献值有所改善．并从Ｓｉ中筛选出了Ｓ更多还原

【Abstract】 We proposed the new series of topological indices S i(i =1,2,3,4). The S i of the compounds, having various bonds or groups (CC,CC,CC,,),were calculated. The simple regression analysis of S i with boiling points are obtained. These results are better than references. According to the correlation coefficient, the topological index S 4 is best. \ \更多还原