1125-85-5

Basic information

• Product Name: 3,4-Dihydro-2H-1,3-benzoxazin-2-one
• Synonyms: 3,4-Dihydro-2H-1,3-benzoxazin-2-one;3,4-Dihydro-benzo[e][1,3]oxazin-2-one;3,4-Dihydro-1,3-benzoxazin-2-one
• CAS NO: 1125-85-5
• Molecular Formula: C₈H₇NO₂
• Molecular Weight: 149.15
• Mol File: 1125-85-5.mol

Chemical Properties

• Boiling Point: 251.2°C at 760 mmHg
• Flash Point: 105.7°C
• Appearance: /
• Density: 1.244g/cm³
• Vapor Pressure: 0.0207mmHg at 25°C
• Refractive Index: 1.562
• CAS DataBase Reference: 3,4-Dihydro-2H-1,3-benzoxazin-2-one(CAS DataBase Reference)
• NIST Chemistry Reference: 3,4-Dihydro-2H-1,3-benzoxazin-2-one(1125-85-5)
• EPA Substance Registry System: 3,4-Dihydro-2H-1,3-benzoxazin-2-one(1125-85-5)

Safety Data

• Hazardous Substances Data: 1125-85-5(Hazardous Substances Data)

Usage

InChI:InChI=1/C8H7NO2/c10-8-9-5-6-3-1-2-4-7(6)11-8/h1-4H,5H2,(H,9,10)

Upstream product

• 61361-08-8 (2-hydroxy-phenyl)-acetyl azide 
• 7093-91-6 chloromethyl isocyanate 
• 108-95-2 phenol 
• 1127-92-0 3,4-dihydro-4-hydroxy-2H-1,3-benzoxazin-2-one 
• 75-44-5 phosgene 
• 932-30-9 2-Hydroxybenzylamine 
• 32315-10-9 bis(trichloromethyl) carbonate 
• 611-20-1 salicylonitrile 
• 201230-82-2 carbon monoxide 

Downstream Products

• 932-30-9 2-Hydroxybenzylamine 
• 1383579-70-1 C₁₆H₁₅FN₂O₄S 
• 1008-83-9 3-methyl-3,4-dihydro-2H-benzo[e][1,3]oxazin-2-one 

Relevant articles and documents

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Cyclization of substituted phenyl N-(2-hydroxybenzyl)carbamates in aprotic solvents. Synthesis of 4H-1,3-benzoxazin-2(3H)-ones

The kinetics of cyclization of substituted phenyl N-(2-hydroxybenzyl)carbamates and their N-methyl analogs, prepared by the reaction of 2-(aminomethyl)phenols with substituted phenyl chloroformates, was studied in dioxane or toluene at the temperatures 110-180 °C. Electron-withdrawing substituents in the leaving phenoxy group strongly accelerate the rate of cyclization (ρ = 2.45 ± 0.15) while the substituents in the other ring have virtually no effect. The cyclization was catalyzed with triethylamine in toluene but not in dioxane. On the basis of these results, the most convenient method for preparation of substituted 4H-1,3-benzoxazin-2(3H)-ones was a one-hour reflux of substituted 4-nitrophenyl N-(2-hydroxybenzyl)carbamates in dioxane. Based on the influence of substituents, solvents (dioxane and toluene) and triethylamine, the reaction mechanism and structure of the transition state were proposed.