2.6- Dimethyl acetophenone

Mit den elektrophilen Chlor-aluminiumhydriden wird dagegen die Hydrogenolyse beschleunigt, so da6 man z.B.6 7 aus 2,4-Dimethyl-acetophenon in siedendem Diathyl-ather 90% d.Th. 2,4-Dimethyl-l-athyl-benzol7 erhalt ... 

The Effect of Initiator Concentration on the Rate of Polymerization. BME, 2,2-dimethoxy-2-phenyl acetophenone, 2-hydroxy-2,2-dimethyl acetophenone and Darocur-3331 (its structure is not known) were chosen for further evaluation on the effect of initiator concentration on the rate of polymerization. They were chosen because they are the among the most active or the least active initiator in polymerizing HEMA. 

An ester of a phenol may be converted to the isomeric o or p-hydroxy ketone, or a mixture of both, by treatment with aluminum chloride. Critical discussions of the reaction have been presented with respect to the influence of temperature, solvents, ester-reagent ratio, and the structure of the acyl and phenoxy groups, By varying the first three factors, it is often possible to prepare predominantly either of the isomeric ketones. The reaction is exemplified in the preparation of o- and p-propiophenol (35% and 40%, respectively) and 2-hydroxy-4,6-dimethyl-acetophenone (80%). ... 

Dry carbon disulfide Caution—volatile toxic substance) is added to 100 g. (0.62 mole) of anhydrous ferric chloride in an amount sufficient to cover the solid. To the resulting mixture is added slowly with agitation a solution of 100 g. (0.94 mole) of m-xylene and 84 g. (1.07 moles) of acetyl chloride. Hood.) The addition requires about 45 minutes, and the mixture is then heated on a steam bath until evolution of hydrogen chloride ceases (about 2 hours). The resulting thick, dark liquid is poured into water, and the organic material is extracted from the aqueous phase with ether. The ethereal solution is washed with water and dilute aqueous sodium hydroxide solution and dried over calcium chloride. Distillation gives a 74% yield of 2,4-dimethyl-acetophenone boiling at 92-94°/5 mm., 1.5340. 

C14H20O 4 -tert-butyl-2 ,6 -dimethyl acetophenone 2040-10-0 558.15 49.498 2 27700 C14H2202 2,5-di-tert-butylhydroquinone 88-58-4 528.15 46.595 2... 

H3C)2C6H(N02)2.COOH mw 240.17, N 11.67%. Only three isomers are known 3,5 Dinitro-2,4 dimethylbenzoic Acid, firysts (acetic acid), mp 197-203° mod sol in ale, eth chlf si sol in hot w can be prepd by nitrating 2,4-dimethylbenzoic acid with mixed acid, or by oxidizing 3,5-dimtro-2,4-dimethyl-acetophenone with KMnO (Refs 1 4). Its expl props are not reported 2,4 i iiTO 3,3 dimethylhenzoic Acid, ndls (from w or xylene), mp 210.5—211° mod sol in ale hot xylene v si sol in w petr eth was ohtd with the 2,6-dinttro deriv when 3,5 dimethylbenzoic acid was treated with nitric acid Cd 1.525) at 40-50°(Refs 2 3). Us expl props are not reported... 

When mcte-xylene is acylated in the presence of scandium triflate (20% mol) combined with lithium perchlorate in nitromethane, 2,4-dimethyl-acetophenone is obtained in 89% yield. In the absence of scandium triflate, lithium perchlorate is not soluble in the reaction mixture, and no acylation... 

Broin.ftthyl].p.tolyl.keton 7 II247. (u-Brom.4- iliyl-acetophenon 7 1171. e60-Btom-3.4-dimsthyI-acetophenon 7, 323. [Pg.428]

Oxy-3,6-dimethyl-acetophenon 8 II126. eso-Acetybasymm.-m-xylenol 8,122. 6-Oxy-2.3.4 ti etbyl-benzaldehyd 8 II125. 

Preparation by reaction of 46% hydrobiomic acid solution with 4-(benzyloxy)-3,5-dimethyl-acetophenone in the presence of tetrabutylammonium bromide in refluxing methylene chloride (53%) [2987],... 

Preparation by demethylation of 6-methoxy-2,3-dimethyl-acetophenone with aluminium chloride in boiling benzene (30%) [2212], The above keto anisole itself was obtained by reaction of dimethylcadmium on 6-methoxy-2,3-di-methylbenzoyl chloride in boiling benzene. 

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