 In 1959 he was offered a position at the Max Planck Institute for Bioinorganic Chemistry in Mülheim with Günther Otto Schenck.There he worked on the industrial-scale application of photooxygenation reactions employing singlet oxygen, ene reactions and sigmatropic rearrangements.Ohloff returned to Industry in 1962, joining Firmenich in Geneva to head the process-research group.