Process for making sulfonyl isocyanates
This invention relates to an improved method of making sulfonyl isocyanates from the corresponding sulfonamides and phosgene.
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Claims
1. In a process for making a compound of the formula
- J is ##STR2## by reacting a compound of the formula J--SO.sub.2 NH.sub.2 with phosgene in a reaction mixture comprising the compound J--SO.sub.2 NH.sub.2, phosgene and a solvent, the improvement comprising conducting the reaction in the presence of a molar excess of phosgene relative to the compound J--SO.sub.2 NH.sub.2.
2. The process of claim 1 wherein the percent by weight of phosgene in the reaction mixture is at least 2%.
3. The process of claim 2 wherein the percent by weight of phosgene in the reaction mixture is at least 5%.
4. The process of claim 1 wherein J is J-1.
Patent History
Patent number: H1696
Type: Grant
Filed: Feb 21, 1997
Date of Patent: Nov 4, 1997
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Inventors: David Akueteh Adjei (Hockessin, DE), Charles T. Blaisdell (Middletown, DE)
Primary Examiner: Charles T. Jordan
Assistant Examiner: Meena Chelliah
Attorney: Elliott A. Katz
Application Number: 8/793,188
Type: Grant
Filed: Feb 21, 1997
Date of Patent: Nov 4, 1997
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Inventors: David Akueteh Adjei (Hockessin, DE), Charles T. Blaisdell (Middletown, DE)
Primary Examiner: Charles T. Jordan
Assistant Examiner: Meena Chelliah
Attorney: Elliott A. Katz
Application Number: 8/793,188
Classifications
