2-Methylhydroquinone synthesis
- Product Name:2-Methylhydroquinone
- CAS Number:95-71-6
- Molecular formula:C7H8O2
- Molecular Weight:124.14
Yield:553-97-9 99% ，95-71-6 0.5%
Reaction Conditions:
with dihydrogen peroxide;Ti-superoxide in water;acetic acid; for 1.25 h;Product distribution / selectivity;Heating / reflux;
Steps:
7
Preparation of 2-methyl-1, 4-benzoquinone A mixture of m-cresol (5 mmol) and Ti-superoxide catalyst (125 mg, 20% w/w) in acetic acid (5 ml) was heated with stirring at 50-60 C under inert atmosphere. To this reaction mixture was added aq. 30% H202 (20 mmol) drop wise over 15 min. and heated for 1 h. The catalyst was recovered by simple filtration and 2-methyl-1, 4-benzoquinone formed (99%) was separated by chromatographic purification.Table 1: Ti-superoxide (1) catalyzed oxidation of phenols to quinines and hydroquinones with aq. 30% H202 : a Ex. Substrate t/h Conversion ProductU Selectivity (%) c No. (%) Quinone HQd 1. Phenol 10 22 2 20e 91. 0 2. Phenol 8 66 5 6 92. 4 3. Phenol 7 65 3 60 92.3 4. Phenol 7 68 3.5 63g 92.7 5. Phenol 1 92 88 2.3 95.7 6. o-Cresol 1 99 96 3.0 97.0 7. 7n-Cresol 1 100 99 0.5 99.0 8. 2,6-Dimethylphenol 1 100 97 2.0 97.0 9. 2-'Butylphenol 1 99 97 0. 7 98.0 10. 2, 6-Dibutylphenol 3 70 65 2. 0 93.0 11.4-Chlorophenol 1 57 55-96.5 12.4-Bromophenol 1 61 60-98. 4 13. 4-Iodophenol 1 77 75-97.4 14.2, 4-Dichlorophenol 1 32 25 5. 0 78.1 (a) See examples for detailed experimental procedure; (b) determined by GC analysis of the crude product; (c) selectivity to hydroquinone ; (d) hydroquinone; (e) aq. 10% H202; (f) aq.50% H202; (g) 40% w/w catalyst.
References:
WO2005/63664,2005,A1 Location in patent:Page/Page column 7
553-97-9
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108-39-4
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95-71-6
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95-71-6
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