17072-61-6

Basic information

• Product Name: 2,2,4-trimethylglutaric acid dimethyl ester
• Synonyms: 2,2,4-trimethylglutaric acid dimethyl ester
• CAS NO: 17072-61-6
• Molecular Weight: 202.251
• Mol File: 17072-61-6.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: 2,2,4-trimethylglutaric acid dimethyl ester(CAS DataBase Reference)
• NIST Chemistry Reference: 2,2,4-trimethylglutaric acid dimethyl ester(17072-61-6)
• EPA Substance Registry System: 2,2,4-trimethylglutaric acid dimethyl ester(17072-61-6)

Safety Data

• Hazardous Substances Data: 17072-61-6(Hazardous Substances Data)

Upstream product

• 2589-57-3 2-(1-methoxycarbonyl-1-methylethylazo)-2-methylpropionic acid methyl ester 
• 80-62-6 methacrylic acid methyl ester 
• 90683-33-3 (+/-)-tetramethyl 2,4,5,7-tetramethyloctane-2,4,5,7-tetracarboxylate 
• 1101-55-9 7,7-Diphenyl-p-mentha-1⁽⁷⁾,2,5-trien-8-carbonsaere-methylester 
• 2589-57-3 dimethyl 2,2'-azobis(isobutyrate) 
• 108-95-2 phenol 
• 71-43-2 benzene 

Relevant articles and documents

Dissociation and Aromatization of a Semibenzene. Reactions of Triphenylmethyl and Methyl Isobutyryl Radicals

Semibenzene 4, which can be regarded as the recombination product of triphenylmethyl and methyl isobutyryl radicals (5), affords exactly these intermediates on thermolysis or inefficiently on direct photolysis.Recombination and disproportionation of these dissimilar radicals proceeds with a much lower barrier than the dimerization of triphenylmethyl.Whereas thiophenol or triplet 9-fluorenone aromatize 4, thermolysis in the presence of 1,4-cyclohexadiene allows trapping of 5 and oligomeric radical 13.From the measured heat of aromatization (22.0 kcal/mol), the C-H bond dissociation enthalpy of 4 and its analogue lacking the side chain ("p-isotriphenylmethane") is calculated to be 54 kcal/mol, the lowest value known for any closed-shell, neutral hydrocarbon.Exposure of 4 to the atmosphere causes rapid autoxidation to hydroperoxide 19, which thermolyzes in the GC to aromatic ketones and phenols instead of undergoing a 1,2-aryl shift.

The Self-Reactions of 1-Methoxycarbonyl-1-methylethyl and Higher Ester Radicals: Combination vs Disproportionation and Oligomeric Products from Secondary Reactions

The geminate self-reactions of the title methyl, ethyl and butyl ester radicals (2a-c), formed by decomposition of the corresponding azo precursors (1a-c) in the presence of stable nitroxide radical scavengers, were found on the basis of product analysis to comprise combination and disproportionation in the ratios 56 : 44 (methyl), 58 : 42 (ethyl) and 47 : 53 (butyl).In the absence of radical scavengers, extensive oligomerization is observed.Hydrogenation and degradation were used in conjunction with g.l.c.-m.s. to deduce the identities of the dimeric, trimeric and tetrameric products, which were in most cases subsequently confirmed by isolation and n.m.r. analysis.Of particular interest is the highly regioselective disproportionation of radical (3) to give dimethyl 4-methylpent-1-ene-2,4-dicarboxylate (8), and the further reaction of (8) with (2a) to form branched oligomers (10) and (15).