Cover Picture (Angew. Chem. Int. Ed. Engl. 10/1991)

The cover picture is both a tribute to Switzerland on the occasion of its 700th anniversary and a symbol of the good contact between Angewandte Chemie and the Swiss chemical research. It shows within a chiral Swiss cross four principle routes to enantiomerically pure plant protection chemicals (outside the cross). Nature, the source of all chiral compounds, forms the centerpiece. The modern agrochemical industry follows all four pathways to produce chiral, bioactive compounds. The routes must satisfy two criteria in particular to be considered for industrial synthesis: ecological and economical viability. G. M. Ramos Tombo and D. Belluš report on the role of modern synthetic chemistry in this challenging field on p. 1193 ff.