Ernst Cohen and the challenge of a truly international union

In 1925, the Dutchman Ernst Julius Cohen was unanimously elected president of the IUPAC at the annual meeting in Bucharest. Although quite well known as able linguist, physical chemist and student of J.H. van ‘t Hoff, no one could have suspected this turn of events three years earlier. On 21 June 1922, Cohen had organized an informal, purely scientific meeting in Utrecht— the International Chemical Reunion Utrecht —to restore friendly relations between scientists from all previously warring nations. However, Belgian and French chemists, headed by Jean Timmermans and Charles Moureu, boycotted this meeting as they had not yet forgotten the atrocities of the ‘chemists’ war.’ [...]