Marcellin Pierre Eug"u00E8ne Berthelot (25 October 1827 - 18 March 1907) was a French chemist and politician noted for the Thomsen-Berthelot principle of thermochemistry . He synthesized many organic compounds from inorganic substances and disproved the theory of vitalism. He is considered as one of the greatest chemists of all time. He was born at Paris, the son of a doctor. After doing well at school in history and philosophy, he became a scientist.