Prediction of the critical temperatures (liquid-vapor) of organic compounds

The ampule method was used to measure the critical temperatures (liquid-vapor) for 1,4-and 1,3-tert-butylbenzenes, 1,3,5-tri-tert-butylbenzene, and 3,5-di-tert-butyltoluene. For alkanes, alkenes, alkylbenzenes, alkylphenols, and alcohols, sets of parameters for the additive components in the Tatevskii bond method and in the method based on the Randic molecular connectivity indices were obtained. The need to create individual correlations for alcohols within the framework of any method in which the normal boiling temperature is used as the basis property was substantiated. The predictive possibilities of various methods were compared. The method based on the Randic molecular connectivity indices was demonstrated to be most effective.