METHOD FOR MAKING CARBAMATES, UREAS AND ISOCYANATES
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United States of America Patent
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Issued Date -
Mar 1, 2012
app pub date -
Nov 4, 2011
filing date -
Nov 3, 2008
priority date (Note) -
Abandoned
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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 derivatized 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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