20959-22-2

Basic information

• Product Name: 3,6-Dimethyl-2-phenylpyrimidin-4(3H)-one
• Synonyms: 3,6-Dimethyl-2-phenylpyrimidin-4(3H)-one
• CAS NO: 20959-22-2
• Molecular Formula: C₁₂H₁₂N₂O
• Molecular Weight: 200.24
• Mol File: 20959-22-2.mol

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 3,6-Dimethyl-2-phenylpyrimidin-4(3H)-one(CAS DataBase Reference)
• NIST Chemistry Reference: 3,6-Dimethyl-2-phenylpyrimidin-4(3H)-one(20959-22-2)
• EPA Substance Registry System: 3,6-Dimethyl-2-phenylpyrimidin-4(3H)-one(20959-22-2)

Safety Data

• Hazardous Substances Data: 20959-22-2(Hazardous Substances Data)

Upstream product

• 67-56-1 methanol 
• 86421-66-1 2,3-dimethyl-6-phenyl-4(3H)-pyrimidinone 
• 107465-72-5 5-(1-benzoylaminoethylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione 
• 13514-79-9 6-methyl-2-phenyl-3H-pyrimidin-4-one 
• 77-78-1 dimethyl sulfate 
• 51779-50-1 4-methyl-2-phenyl-6H-1,3-oxazin-6-one 
• 74-89-5 methylamine 

Downstream Products

• 108169-12-6 ammonium 2,4-dimethyl-6-phenylpyrimidine-5-carboxylate 
• 86421-82-1 N-((E)-2-Methylcarbamoyl-1-phenyl-vinyl)-acetimidic acid methyl ester 
• 3213-91-0 3-phenyl-5-methyl-1H-1,2,4-triazole 
• 86421-70-7 2,5-Dimethyl-1-phenyl-2,6-diaza-bicyclo[2.2.0]hex-5-en-3-one 
• 13514-79-9 6-methyl-2-phenyl-3H-pyrimidin-4-one 
• 13906-09-7 2-thioxo-2,3-dihydro-1H-quinazolin-4-one 
• 89318-04-7 6-phenyl-1,2,4-trimethylpyrimidinium-5-carboxylate 
• 86421-66-1 2,3-dimethyl-6-phenyl-4(3H)-pyrimidinone 

Relevant articles and documents

1,3-Oxazines and Related Compounds. XII. Facile Synthesis of 2,4-Disubstituted 6H-1,3-Oxazin-6-ones

A convenient method for synthesis of 2,4-disubstituted 6H-1,3-oxazin-6-ones (8) was developed.Acylaminoalkylidene-1,3-dioxane-4,6-diones (5a-l), which were prepared from N-acylimidates (3a-l) and Meldrum's acid (4), readily underwent thermolysis upon heating, leading to a variety of 2,4-disubstituted 6H-1,3-oxazin-6-ones (8a-l).Keywords - 6H-1,3-oxazin-6-one; Meldrum's acid; acylaminoalkylidene-1,3-dioxane-4,6-dione; N-acylimidate; thermolysis

Formation and Reactions of Dewar 4-Pyrimidinones in the Photochemistry of 4-Pyrimidinones at Low Temperature. 2

The photochemistry of the 4-pyrimidinones 1b-l in liquid NH3-ether solution at -40 deg C or in methanol at -10 to -40 deg C was studied.Irradiation of 1b-g at low temperature gave the corresponding Dewar 4-pyrimidinones (2b-g), whose physical properties (IR, NMR, and UV) were determined.The photolysis of 1h-j in methanol at -10 to -20 deg C gave methanol adducts 5-7 which suggested the formation of the Dewar 4-pyrimidinones 2h-j.However, the intermediate 2h could not be detected in liquid NH3-ether solution at -40 deg C.The hydrogen of the amino group increases sharply the reactivity of 2h-j.Irradiation of 1k and 1l in liquid NH3-ether solution at -40 deg C gave the crystalline product 3 and inseparable products, respectively, which did not suggest the formation of 2k and 2l.Presumably, the excited 4-pyrimidinone 1k directly reacts with ammonia before electrocyclization.The 4-pyrimidinone 1l may decompose by excitation.The reactions of the Dewar 4-pyrimidinones 2a-j in methanol and in methanol containing sodium methoxide were studied.The products were the β-lactam 4, imino ether 5, and acetals 6-8.The Dewar 4-pyrimidinones 2e-g gave inseparable products and two unidentified products in methanol, respectively.