5752-21-6

Basic information

• Product Name: 7,9-dimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-9-ium
• CAS NO: 5752-21-6
• Molecular Formula: C₇H₈N₄O₂
• Molecular Weight: 181.1714
• Mol File: 5752-21-6.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 7,9-dimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-9-ium(CAS DataBase Reference)
• NIST Chemistry Reference: 7,9-dimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-9-ium(5752-21-6)
• EPA Substance Registry System: 7,9-dimethyl-2,6-dioxo-2,3,6,7-tetrahydro-1H-purin-9-ium(5752-21-6)

Safety Data

• Hazardous Substances Data: 5752-21-6(Hazardous Substances Data)

Upstream product

• 113186-94-0 7,9-dimethyl-8-thio-uric acid 
• 86180-29-2 7,9-dimethylxanthinium iodide 

Downstream Products

• 83-67-0 theobromine / 
• 19039-41-9 7,9-dimethyluric acid 

Relevant articles and documents

ISOMERIZATION AND DEALKYLATION OF METHYLATED XANTHINIUM DERIVATIVES

The isomerization or dealkylation of methylated xanthinium derivatives takes place with the participation of nucleophiles and is facilitated in the presence of a sterically hindered configuration.When heated, 7,9-dimethyl- and 1,7,9-trimethylxanthinium salts isomerize to theobromine and caffeine respectively.Under these conditions 3,7,9-trimethyl- and 1,3,7,9-tetramethylxanthinium salts are dealkylated.The 1,7,9- and 3,7,9-trimethylxanthinium betaines are isomerized quantitatively to caffeine.The role of the nucleophile under these conditions is played by the negatively charged fragment in the pyridine part of molecule.An intermolecular mechanism of rearrangement of the 3,7,9-trimethylxanthinium betaine is demonstrated.The sterically overloaded 1,3,8,9-tetramethylxanthine and 1,3,9-trimethyl-8-azaxanthine and not the charged compounds undergo rearrangement.In these cases the nucleophilic center is the doubly bonded N7 atom in the five-membered ring.