33664-90-3

Basic information

• Product Name: 2(5H)-Oxazolone, 5,5-dimethyl-4-phenyl-
• CAS NO: 33664-90-3
• Molecular Formula: C11H11NO2
• Molecular Weight: 189.214
• Mol File: 33664-90-3.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 2(5H)-Oxazolone, 5,5-dimethyl-4-phenyl-(CAS DataBase Reference)
• NIST Chemistry Reference: 2(5H)-Oxazolone, 5,5-dimethyl-4-phenyl-(33664-90-3)
• EPA Substance Registry System: 2(5H)-Oxazolone, 5,5-dimethyl-4-phenyl-(33664-90-3)

Safety Data

• Hazardous Substances Data: 33664-90-3(Hazardous Substances Data)

Upstream product

• 24568-18-1 Sodium; 3,3-dimethyl-2-phenyl-oxirane-2-carboxylate 
• 89848-88-4 3,3-Dimethyl-2-phenyl-oxirane-2-carbonyl chloride 
• 89849-05-8 3,3-Dimethyl-2-phenyl-oxirane-2-carbonyl azide 
• 1189-71-5 isocyanate de chlorosulfonyle 
• 7473-98-5 2-hydroxy-2-methylpropiophenone 

Downstream Products

• 33664-93-6 5,5-dimethyl-4-phenyl-oxazolidin-2-one 

Relevant articles and documents

Synthesis of α,β-Epoxyacyl Azides and Their Rearrangement to Epoxy Isocyanates and 3- and 4-Oxazolin-2-ones

The conversion of α,β-epoxy carboxylates 6 into α,β-epoxyacyl azides 4 proceeds either via reaction of the mixed anhydrides 7 with sodium azide or via reaction of epoxyacyl chlorides 8 with hydrazoic acid-pyridine.The latter method is preferred.The azides 4 undergo a smooth thermal Curtius rearrangement to give 4-oxazolin-2-ones 10 for the substrates 4a-h having a hydrogen atom at C(β).Monitoring this reaction by means of IR shows that the epoxy isocyanates 5 are intermediates.Intramolecular ring expansion of 5 then leads to 3-oxazolin-2-ones 9 that tautomerizeto the 4-isomers 10a-h.Epoxyacyl azides 4i,n-q, having no hydrogen atom at C(β), producing 3-oxazolin-2-ones 9i,n-q by a proton shift is not possible.The products 9i and 9q rapidly add water at the imine bond to give oxazolidin-2-ones 11.Epoxy isocyanate 5k is reasonable stable in solution; reaction with methanol affords urethane 12.