Method for making carbamates, ureas and isocyanates

Details Method for making carbamates, ureas and isocyanates Method for making carbamates, ureas and isocyanates

2008-12-31

2011-11-15

Puttlitz, Karl J (Department: 1621)

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

Organic compounds

Carboxylic acid esters

C560S133000, C564S048000, C564S063000

Reexamination Certificate

active

08058469

ABSTRACT:
The present invention provides methods of forming carbamates, ureas, and isocyanates. In certain embodiments these methods include the step of reacting an amine with an ester-substituted diaryl carbonate to form an activated carbamate which can be further derivitized to form non-activated carbamate or a urea. The urea or carbamate can be subjected to a pyrolysis reaction to form isocyanate.

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