Based on the molecular inductive effect index, a formula consisting of three parameters was proposed to calculate the boiling point of aliphatic aldehydes and alkanones. ln (820.5 - T_b) = 6.38327 - 1. 23961 * 10~(-1)N_c + 1.95353ΔI + 6.68434 * 10~(-2)N, where the N_c is the effective length of carbon chain of alkyl group in the aliphatic aldehydes and alkanones. The ΔI is the inductive effect index difference between the corresponding branched and normal alkyl isomer containing the same carbon atom number, which expresses the effect of carbonyl group on the boiling point of aliphatic aldehydes and alkanones. N is the numbers of carbon atoms of aliphatic aldehydes and alkanones.

Key words: MOLECULAR;INDUCTIVE EFFECT;EXPONENT;BOILING POINTS, ALIPHATIC ALDEHYDES;ALIPHATIC KETONES;ACTIVITY