Carl Paal (1860-1935)

German chemist, professor in Erlangen and Leipzig. In 1884 he described the synthesis of furans from 1,4-dicarbonyl compounds, at the same time as Ludwig Knorr described that of pyrroles: the Paal–Knorr synthesis.

He later devoted himself to colloidal metals, in particular colloidal palladium and platinum, which he used as hydrogenation catalysts.

More information: de.wikipedia.org