43.1 UPAC nomenclature of alkanes What is it UPAc? The formal system of nomenclature used today is one proposed by the International Union of Pure and Applied chemistry (IUPAC). This system was first developed in 1892. Each different compound should have a different name and make a systematic set of rules4.3.1 IUPAC nomenclature of alkanes What is it IUPAC? The formal system of nomenclature used today is one proposed by the International Union of Pure and Applied Chemistry (IUPAC). This system was first developed in 1892. Each different compound should have a different name and make a systematic set of rules