| 摘要 |
1,197,858. Organic isocyanates. OLIN MATHIESON CHEMICAL CORP. 22 March, 1968 [6 April, 1967], No. 14064/68. Heading C2C. A process for the preparation of organic isocyanates comprises reacting an organic nitro compound with at least 3 moles of carbon monoxide at a temperature of at least 60‹ C. and pressure of at least 30 p.s.i. using a catalyst comprising: I a mixture of (A) a halide of platinum, rhodium, iridium, rhenium or palladium, or an oxide of palladium, rhodium or platinum; and (B) a triaryl-phosphine, trialkylphosphite, triarylphosphite, or triarylalkylphosphonium halide; or II a metal triaryl phosphine halide, said metal being palladium, rhodium, iridium, rhenium or platinum. Aromatic, cycloaliphatic, aliphatic and heterocyclic mono- or poly nitro compounds, which may be substituted, may be used as starting materials. A list of starting materials includes nitrobenzenes substituted by one or more of the following groups: Me, Et, F, Cl, Br, OMe, OEr, -COOMe, -CHO, -COCl, -CN, -NCO, -SO 2 Cl and -CH 2 NO 2 . Examples of the noble metal based catalysts include the oxides, halides, sulphates, nitrates, cyanides and carbonyls of Pd, Ru, Ph, Os, Au, Pt and Ir. Many organophosphorus compounds, which may contain substituents, are specified. The preparation of phenyl isocyanate is exemplified. |
