US2003009031A1PendingUtilityA1

Novel hindered spiro-ketal nitroxides

41
Priority: Apr 30, 2001Filed: Apr 30, 2001Published: Jan 9, 2003
Est. expiryApr 30, 2021(expired)· nominal 20-yr term from priority
Inventors:Mikolaj JawosiukJ. Michael ClumpnerAnthony J. O'Lenick, Jr.
C07D 491/10
41
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Claims

Abstract

The present invention discloses a series of novel hindered spiro-ketal nitroxides prepared by the ketalization reaction of 1,3-propanediols with triacetoneamine followed by oxidation. This invention also shows that these novel spiro-nitroxides are capable of inhibiting vinyl and acrylate polymerizations using an effective inhibition concentration of the nitroxide of the present invention.

Claims

exact text as granted — not AI-modified
What is claimed  
     
         1 . A compound conforming to the following structure:  
       
         
           
           
               
               
           
         
       
       wherein;  
       R is selected from the group consisting of hydrogen, methyl, ethyl and n-propyl, isopropyl, n-butyl, isobutyl, and l-methylpropyl.  
     
     
         2 . A compound of  claim 1  wherein R is hydrogen.  
     
     
         3 . A compound of  claim 1  wherein R is methyl.  
     
     
         4 . A compound of  claim 1  wherein R is ethyl.  
     
     
         5 . A compound of  claim 1  wherein R is n-propyl.  
     
     
         6 . A compound of  claim 1  wherein R is isopropyl.  
     
     
         7 . A compound of  claim 1  wherein R is n butyl.  
     
     
         8 . A compound of  claim 1  wherein R is isobutyl.  
     
     
         9 . A compound of  claim 1  wherein R is 1-methylpropyl.

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