| 摘要 |
1302916 Organic isocyanates OLIN CORP 10 Feb 1970 [10 Feb 1969] 6344/70 Addition to 1275809 Heading C2C [Also in Division B1] Organic isocyanates are produced by reacting an organic nitro compound with carbon monoxide at elevated temperature and pressure in the presence of a mixture or complex of (i) a noble metal halide or oxide and (ii) nitrogencontaining compound of formula RR<SP>1</SP>NC(Y) = X wherein: X is O, S, NR<SP>3</SP> or NR<SP>2</SP>.A where A is an inorganic acid; Y is R<SP>4</SP>, halogen, NR<SP>5</SP>R<SP>6</SP> or SR<SP>7</SP>; and any R is hydrogen, alkyl, aryl, alkaryl, aralkyl or alkoxyaryl-all optionally halogen substituted (see Division B1). Many suitable organic nitro compounds, nitrogencontaining compounds and noble metal halides are specified. The examples all relate to the conversion of 2,4-dinitro toluene to 2,4-toluene di-isocyanate, 2-isocyanato-4-nitrotoluene and 4. isocyanato - 2 - nitrotoluene at 190� C. and 2500-3800 p.s.i.g. |
