Preparation of aromatic isocyanates

Abstract

Abstract THE PROCESS FOR PREPARING AN ORGANIC ISOCYANATE BY REACTING AN ORGANIC NITRO COMPOUND WITH CARBON MONOXIDE IN THE PRESENCE OF A CATALYST SYSTEM COMPRISED OF A MIXTURE OR COMPLEX OF A NITROGEN-CONTAINING HETEROAROMATIC COMPOUND AND A HALIDE OF A NOBLE METAL. THE HETEROAROMATIC NITROGEN-CONTAINING COMPOUND IS ONE CONTAINING BETWEEN FIVE AND SIX MEMBERS IN THE RING, CONTAINING NO ELEMENT OTHER THAN NITROGEN AND CARBON IN THE RING, CONTAINING NO MORE THAN TWO NITROGEN ATOMS IN THE RING, AND HAVING AT LEAST TWO DOUBLE BONDS IN THE RING. PYRIDINE AND ISOQUINOLINE ARE THE PREFERRED HETEROAROMATIC COMPOUNDS. THE NOBLE METAL HALIDE IS PREFERABLY A HALIDE OF PALLADIUM, RHODIUM, IRIDIUM, PLATINUM, OR MIXTURES THEREOF. THE CATALYST SYSTEM MAY ALSO INCLUDE A THIRD COMPONENT SUCH AS MOLYBDENUM TRIOXIDE OR ANOTHER METAL OXIDE.

Inventors

• 👤 Eric Smith
• 👤 Wilhelm Schnabel

Bibliographic Details