Prominent Romanian chemist Costin Neniţescu was born in Bucharest, Romania. He completed his studies in chemistry at the Ludwig Maximilians University in Munich, where he was one of the favourite students of Hans Fischer. From 1935, he was professor of organic chemistry at the Polytechnic Institute and University of Bucharest, and starting in 1947 he directed a research unit of the Ministry of Chemical Industry.
In 1964 he was the founder of the Research Centre for Organic Chemistry of the Romanian Academy (today Centrul de Chimie Organica Costin D. Neniţescu), whose director and illustrious animator he remained until his death.
His main research domains include the general mechanism of Friedel-Crafts-like reactions in the series of aliphatic hydrocarbons, and the mechanism of the isomerisation of cyclobasics. He searched for ways of obtaining cyclobutadiene, while explaining the chemistry of this unstable substance and isolating its dimers. He identified a formerly unknown group of naphthenic acids in Romanian crude oil.
His remarkable technical and scientific activity helped develop the chemical industry in Romania. In honour of his work and achievements, he was invited to become a member of the Romanian Academy in 1955. In addition, he was a corresponding member of the German Academy of Sciences and an honorary member of the Hungarian Academy of Sciences.