Due to its ability to provide directly reaction rate data and its in-s
itu nature, reaction calorimetry has become one of the most powerful p
robes of reaction pathways and mechanisms of chemical reactions by vir
tue of providing high-quality kinetic data. In this paper, examples of
enantioselective hydrogenation and selective consecutive hydrogenatio
n reactions are presented to demonstrate the high quality of kinetic d
ata obtainable from the reaction calorimetry. They are also used to il
lustrate the use of reaction calorimetry for elucidating reaction path
ways and mechanisms from detailed kinetic and thermodynamic informatio
n about individual step involved in multi-step reactions that is other
wise difficult to obtain without calorimetry.