20012-39-9

Basic information

• Product Name: 2,4,6-trichloro-3,4-dimethylcyclohexa-2,5-dienone
• Synonyms: 2,4,6-trichloro-3,4-dimethylcyclohexa-2,5-dienone
• CAS NO: 20012-39-9
• Molecular Weight: 225.502
• Mol File: 20012-39-9.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 2,4,6-trichloro-3,4-dimethylcyclohexa-2,5-dienone(CAS DataBase Reference)
• NIST Chemistry Reference: 2,4,6-trichloro-3,4-dimethylcyclohexa-2,5-dienone(20012-39-9)
• EPA Substance Registry System: 2,4,6-trichloro-3,4-dimethylcyclohexa-2,5-dienone(20012-39-9)

Safety Data

• Hazardous Substances Data: 20012-39-9(Hazardous Substances Data)

Upstream product

• 1124-04-5 2-chloro-4,5-dimethylphenol 
• 95-65-8 3,4-Dimethylphenol 
• 1570-67-8 2,6-dichloro-3,4-dimethylphenol 

Relevant articles and documents

Electrophilic Chlorination of 4-Methylphenols with Molecular Chlorine. Synthesis of Dimethoxy Aromatics by Methanolysis of 4-Chloro-4-methylcyclcohexa-2,5-dienones

The chlorination of p-cresol (1a), 2,4-dimethylphenol (1b), 3,4-dimethylphenol (1c), 2,4,5-trimethylphenol (1d), 2,4,6-trimethylphenol (1e) and the various possible mono- and dichloro derivatives of these phenols (3a-d, 6a and 6 c) with molecular chlorine was investigated in dichloromethane or dimethyl formamide solution.The 2,6-substituted p-cresol derivatives all give quantitative yields of 4-chloro-4-methylcyclohexa-2,5-dienones (5b, 5d, 7a, 7c and 2e), whereas the less substituted p-cresol derivatives give a 20-25percent yield of corresponding 4-chloro-4-methylcyclohexa-2,5-dienones (2a-d, 5a and 5c), the other products being chlorinated phenols.Treatment of 4-chloro-4-methylcyclohexa-2,5-dienones with at least one of the double bonds of the ring unsubstituted (2a-c and 4a) with methanol gave a quantitative yield of a 1,3-dimethoxybenzene derivative (9a-c and 10), whereas similar treatment of 4-chloro-2,4,5-trimethylcyclohexa-2,5-dienone (2d) gave 5-methoxy-2,3-dimethylbenzyl methyl ether (11).Treatment of the other 4-chlorodienones with methanol gave the corresponding 4-methoxydienones.Electrophilic chlorination of certain p-cresol derivatives followed by methanolysis hence is a facile although low-yield method for 3-methoxylation or selective side chain oxidation of these p-cresol derivatives.