Abstract

Isothermal calorimetry was applied to study the heats of dissolution of lappaconitine hydrobromide at varied dilution. The data obtained were used to calculate the standard enthalpy of dissolution of C32H44N2O8 · HBr in an infinitely diluted (standard) aqueous solution. The heats of combustion and melting of C32H44N2O8 · HBr were calculated using approximate methods. A combination of experimental and calculation techniques was used to find the standard heats of formation of lappaconitine hydrobromide and its 33 analogues.

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