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Historical and Epistemological Aspects of Optical Isomerism on Trivalent Sulfur and Nitrogen Atoms

Abstract Henry Phillips's explicit postulation, modification and evaluation of several subsequent hypotheses addressing the phenomenon of isomerism of trivalent sulfur compounds in the same manuscript provides an excellent historical example to discuss the development of chemical formulas in an epistemological context. The historical development of isomerism involving sulfur and nitrogen atoms between 1875 and 1925 reflects the interdependency between advances in chemical experimentation and evolution of chemical symbolism from simple empirical and molecular formulas to complex electronic stereostructures. Phillips's work supports the notion that changes in the syntactic rules governing chemical formulas were an important driving force in 20th century organic chemistry.