Basf Aktiengesellschaft

Hans Grassner

Bernhard Schulz

Paul Grafen

Heinz Nohe

Hans-Ulrich Scholz

Peter Jaeger

Werner Reif

Aqueous solutions of polyenyltriarylphosphonium salts are prepared from solutions of the corresponding polyenyltriarylphosphonium salts in organic solvents by driving off the solvent with steam, part of the steam being allowed to condense. Some of the said triarylphosphonium salts may be used directly as pesticides while others are used as intermediates for organic syntheses, especially in the carotinoid field.

Preparation of aqueous solutions or fine aqueous dispersions of

Symmetrical carotenoids are manufactured from the molecular halves thereof by a process wherein phosphonium salts of the molecular halves of these symmetrical carotenoids are oxidized electrochemically in a solvent and in the presence of a base, causing the molecular halves to dimerize, with elimination of substituted phosphine oxide.

Manufacture of symmetrical carotenoids

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Heidelberg, Germany

Hans Grassner