Preparation of urethane and carbonate products

Details Preparation of urethane and carbonate products Preparation of urethane and carbonate products

1992-11-16

1993-11-09

Dees, Jose G.

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

Organic compounds

Carbonate esters

558270, 558271, 558275, 558277, C07C 6996

Patent

active

052604730

ABSTRACT:
The present invention provides a process for preparing urethanes and carbonates from an amine or an alcohol, carbon dioxide and a hydrocarbyl halide. The amine or alcohol is reacted with carbon dioxide in a suitable solvent system and in the presence of an amidine or guanidine base, to form the ammonium carbamate or carbonate salt which is then reacted in a polar aprotic solvent with a hydrocarbyl halide. Polymer products can also be prepared utilizing this process or utilizing the resulting urethanes and carbonates under standard polymerization conditions.

REFERENCES:
patent: 4301087 (1981-11-01), Greene
patent: 4617281 (1986-10-01), Green
patent: 5200547 (1993-04-01), Riley et al.
Abstract of JP-56002937, Jan. 13, 1981.
Abstract of JP-57058645, Apr. 8, 1982.
Yoshida, Y. et al., "Novel Synthesis of Carbamate Ester from Carbon Dioxide, Amines, and Alkyl Halides", Bull. Chem. Soc. Jpn., 62, 1534-38 (1989).
Hori, Y. et al., "New Organic Synthesis with DBU: Part 7. Synthesis of Carbonates and Carbamates with Carbon Dioxide Gas as the Starting Material", Chemistry Express, vol. 1, No. 4, pp. 224-227 (1986).

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