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US 4,777,283 AGranted
Process for the preparation of alkoxycarbonyl isocyanates
AssigneeBayer Aktiengesellschaft
InventorsAndreas Krebs, Hermann Hagemann
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Abstract
Alkoxycarbonyl isocyanates are prepared from carbamic acid esters by reacting these with phosgene and adding a catalyst.
Claims9
A process for the preparation of an alkoxycarbonyl isocyanate from a carbamic acid ester, wherein a carbamic acid ester of the formula ##STR5## in which R represents an unsubstituted or substituted alkyl, cycloalkyl or aralkyl radical and R.sub.1 represents hydrogen or ##STR6## where R has the abovementioned meaning, is reacted with phosgene and a catalyst is added where said catalyst is a N-disubstituted formamide.
Dependencies are inferred from the claim text.