The thermochemistry of alkanethiols and thioethers. Estimation of the enthalpies of formation of 1,3-dithiapropane and 1,3,5-trithiapentane

We have carried out a study on the thermochemistry of alkanethiols and thioethers.Relationships between the enthalpies of formation of alkanes, alkanethiols, and thioethers are discussed with the purpose of deriving different group interconversion contributions that permit the estimation of unknown ∆ f H 0 m (g) values for alkanethiols and thioethers from known values of alkanes.We have also carried out a theoretical study at the G2(MP2), G2, and G3 levels, calculating the enthalpies of formation of two compounds, 1,3-dithiapropane and 1,3,5-trithiapentane, and comparing them with the values previously estimated.