Process for the synthesis of isocyanates and of isocyanate deriv

Details Process for the synthesis of isocyanates and of isocyanate deriv Process for the synthesis of isocyanates and of isocyanate deriv

1985-12-27

1987-11-24

Siegel, Alan M.

Organic compounds -- part of the class 532-570 series

Organic compounds

Isocyanate esters

C07C 7100

Patent

active

047090871

ABSTRACT:
The present invention relates to a process for the synthesis of isocyanates and of isocyanate derivatives. Isocyanates are obtained by reacting an organic halide with a metal cyanate in an organic medium in the presence of a catalyst consisting of a complex of nickel with at least one organic ligand, in which complex the nickel is in the zero oxidation state.
A carbamate or a urea, respectively, are obtained by a subsequent reaction with a hydroxy compound or a primary or secondary amine.
Isocyanates and their derivatives are used especially either as refined synthesis agents for the production of pesticides and medications, or as monomers or comonomers for the preparation of many macromolecular compounds.

REFERENCES:
patent: 3201433 (1965-08-01), Manes
patent: 3558684 (1971-01-01), Von Brachel et al.
patent: 3914311 (1976-10-01), Coulson
patent: 3948966 (1976-04-01), Inamoto
patent: 4130577 (1978-12-01), Wako et al.
patent: 4399074 (1983-08-01), Schaefer
Structure and Mechanism in Organic Chemistry (Second Edition), by C. K. Ingold, Cornell Univ. Press, 1969, pp. 558-561.
"Recent Advances in Isocyanate Chemistry," Shoichiro Ozaki, Chemical Reviews, vol. 72, No. 5, Oct. 1972, pub. by American Chemical Soc., pp. 457-496.
Inorganic Synthesis, vol. XVII, 1977, McGraw-Hill Book Co., Alan G. MacDiarmid, Ed-in-Chief, pp. 120-122.
"The in Situ-generated Nickel(0)-catalyzed Reaction of Aryl Halides with Potassium Iodide and Zinc Powder," Kentaro Takagi et al, 1980, Bulletin Chemical Society of Japan 53-3691-3695, Dec. 1980.

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