一二三四区视频,亚洲少妇熟女色,日本久热无码视频网,欧美国产日韩大尺度,亚洲a视频,久久少妇一区二区,日韩999无码视频,刺激久久久久久久,啊啊啊啊不要啊在线

Welcome to chemicalbook!
Chinese English Japanese Germany Korea
010-86108875
Try our best to find the right business for you.
Do not miss inquiry messages Please log in to view all inquiry messages.

Welcome back!

ChemicalBook CAS DataBase List 2,6-DIMETHYLHYDROQUINONE
654-42-2

2,6-DIMETHYLHYDROQUINONE synthesis

12synthesis methods
-

Yield:527-61-7 97% ,654-42-2 2%

Reaction Conditions:

with dihydrogen peroxide;Ti-superoxide in water;acetic acid at 50 - 60; for 1.25 h;Product distribution / selectivity;

Steps:

8

Preparation of 2, 6-dimethyl-1, 4-benzoquinone A mixture of 2, 6-dimethylphenol (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, 6-dimethyl-1, 4-benzoquinone formed (97%) 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; Table 1

2,6-DIMETHYLHYDROQUINONE Related Search:

扬州市| 资中县| 涟源市| 苍山县| 清涧县| 岑溪市| 县级市| 吴忠市| 长治县| 孝义市| 新蔡县| 太仆寺旗| 肇州县| 连州市| 新建县| 内丘县| 个旧市| 信阳市| 海林市| 衡阳市| 西贡区| 高州市| 洛浦县| 婺源县| 涞水县| 当涂县| 长岛县| 黄冈市| 陆川县| 隆子县| 外汇| 文登市| 柳江县| 万州区| 丰顺县| 云阳县| 济阳县| 饶平县| 来安县| 苏州市| 竹北市|