Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and its derivatives: Dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Faculty of Pure Science of Columbia University

"Synthesis of 2-methyl-4-selenoquinazolone, 2-phenylbenzoselenazole, and Its Derivatives" by Yü-Gwan Chen is a scientific dissertation written in the early 20th century. This meticulous work details the synthesis and analysis of organic selenium compounds and their potential applications in pharmaceuticals and dyes. The author undertakes an exploration of new selenium-based compounds, aiming to uncover their chemical properties and possible uses in various industries. The dissertation presents a comprehensive study that includes the synthesis methods for two primary compounds: 2-methyl-4-selenoquinazolone and 2-phenylbenzoselenazole, along with their various derivatives. Chen discusses the experimental methods employed to create these compounds and provides intricate analyses of their properties, including their pharmacological and tinctorial potentials. The research indicates that these selenium compounds exhibit unique coloring properties and may possess medicinal benefits, particularly in the treatment of certain ailments. Furthermore, the work is grounded in a historical context, referencing past research while simultaneously contributing new findings to the field of organic chemistry.