Hydroquinone dimethyl ether

HjC ° ° CH3 2-(2-ominocorbonyl-oxy-1 -methoxyethyl)-5-methyl hydroquinone dimethyl ether... 

CiiHijNO, 3SS4J-4J-7) see Carboquone 2-(2-aminocarbonyloxy-l-methoxyethyl)-S-methyl-hydroquinone dimethyl ether (CjjHiijNOj 38843-63-9) see Carboquone [6U-[6a,7a,7(iJ )])-3-[[(aminocarbonyl)oxyJmethyl]-7-[[5-carboxy-S-[[(4-methylphenyl)sulfonyl]amino]-l-oxo-pentyl]amino]-7-methoxy-8-oxo-5-thia-l-azabicy-clo[4.2.01oct-2-ene-2-carboxylic acid compd. with A-cyclohexylcyclohexanamine (1 1)... 

Hydrazobenzene, d757 Hydrindene, ilO Hydrocinnamic acid, pl50 Hydroquinone, d430 Hydroquinone dimethyl ether, d495 Hydroxyacetanilides, al5 thru al7 Hydroxybenzene, p65 2-Hydroxybenzenemethanol, hl07... 

The electrolysis apparatus for the polymerization is illustrated in Figure 2, which is characterized by a single cell without a partition membrane between the electrodes. In poor solvents of poly(phenyleneoxide) s such as methanol and acetonitrile, the polymer was deposited on the electrode, i.e. passivation of the electrode occured. Dichlo-romethane, nitrobenzene, and hydroquinone dimethyl ether were selected as the solvents because both the polymer and a supporting electrolyte dissolved in them and they were relatively stable under electrolysis conditions. 

Anodic addition converts enolacetates into a-acetoxyketones or enones, depending on the reaction conditions [135], conjugated dienes into 1,2- or 1,4-dimethoxy alkenes [65], and hydroquinone dimethyl ethers into quinone bisketals [136, 137]. Anodic addition also affords products, some of which are of industrial interest, such as propylene oxide [138a] or 1,4-dimethoxydihydrofuran [138b]. To... 

Hydroquinone dimethyl ether is prepared by etherification of hydroquinone and is used in soap perfumes. 

Ref 2) and para- or Hydroquinone dimethyl ether, lfts, mp 56°, bp 212.6° (Ref 3). Their prepns and other props are in Beil Motion itrodimethoxybenzene, (H3C0)C6Ha(N02)(0CH3) mw 183-16, N... 

Nitro-4-methoxyaniline has been prepared by heating nitro-hydroquinone dimethyl ether with aqueous ammonia 2 by heating the tetramethylammonium salt of 3-nitro-4-aminophenol 3 by the hydrolysis of 2-nitro-4-methoxyacetanilide la with alcoholic potassium hydroxide 11 lc or hydrochloric acid ld and by the hydrolysis of the />-toluenesul fonamide,4 the 3-nitrobenzenesul-fonamide,5 the 3-nitro-/>-toIuenesulfonamide,3 and the acetyl derivative of the />-toluenesulfonamide6 of 2-nitro-4-methoxyani-line with concentrated sulfuric acid. 

This is exemplified in a-naphthol formation (Eq. 22.2) or in the synthesis of / -methoxybenzonitrile from 1,4-dimethoxybenzene (hydroquinone dimethyl ether) [24] ... 

Hydroquinone, AH06 Hydroquinone dimethyl ether, AN6>4 l,i+-Hydroquinone monophosphate, AH O... 

Hydracrylonitrile, hi 69 2-Hydrazinoethanol, hi 20 Hydrazobenzene, d673 Hydrindene, il3 Hydrocinnamic acid, pi 46 Hydroquinone, d379 Hydroquinone dimethyl ether, d433 Hydroquinonesulfonic acid, d382 Hydroxyacetanilides, al5, al6, al7... 

Place 6 g of 1,4-dimethoxybenzene (hydroquinone dimethyl ether) in a 125-mL Erlenmeyer flask, add 10 mL of /-butyl alcohol and 20 mL of acetic acid, and put the flask in an ice-water bath to cool. Measure 10 mL of concentrated sulfuric acid into a 50-mL Erlenmeyer flask, add 10 mL of 30% fuming sulfuric acid or 20 mL of concentrated sulfuric acid, and put the flask, properly supported, in the ice bath to cool. For good thermal contact the ice bath should be an ice-water mixture. Put a thermometer in the larger flask and swirl in the ice bath until the temperature is in the range 0-3°C, and remove the thermometer (solid, ifpresent, will dissolve later). Don t use the thermometer as a stirring rod. Clamp a small separatory funnel in a position to deliver into the 125-mL Erlenmeyer flask so that the flask can remain in the ice-water bath, wipe the smaller flask dry, and pour the chilled sulfuric acid solution into the funnel. While swirling the 125-mL flask in the ice bath, run in the chilled sulfuric acid by rapid drops during the course of 4-7 min. 

Figures 3 and 4 present the infrared and nmr spectra of the starting hydroquinone dimethyl ether. Can you predict the appearance of the nmr spectrum of the product ...

The hydroquinone dimethyl ether moiety of (+)-74 was oxidatively cleaved with ammonium cerium(IV) nitrate ((NH4)2Ce(N03)6), yielding xestoquinone (12b5)-(+)-4 as crystals mp 213-216°C dec natural, mp 212-214°C dec (Scheme 15). Xestoquinone (12bS)-(+)-4 was finally reduced with sodium hydrosulfite to afford xestoquinol (12bS)-62 in an almost quantitative yield. Although xestoquinol 62 has not been isolated yet as a natural product, the spectroscopic data of the synthetic sample reasonably support its structure. The first total synthesis of (+)-xestoquinone and xestoquinol has been thus achieved. 

Oxidative cleavage of hydroquinone ethers.2 The reagent oxidatively cleaves p-hydroquinone dimethyl ethers to p-quinones in good yield. A mineral add (nitric or perchloric adds are most efficient) is required and the oxidant must be present in excess for high conversions. o-Quinones can be obtained in moderate yields. 

Hydroperoxy-2-nitropropane, 256 p-Hydroquinone, 331,393,418 p-Hydroquinone dimethyl ethers, 432 Hydroquinones, 72 Hydrosilylation, 562 Hydroxamic acids, 204 2-Hydroximino-l-phenylpropane, 124 ai-Hydroxyacetophenone, 342 (3-Hydroxyacetylenes, 144-145 a-Hydroxy acids, 492 (5-Hydroxy acids, 301 1-Hydroxyadamantane, 126 a-Hydroxyaldehydes, 342 3o-Hydroxy-5a-androstene-17-one, 227-228... 

Synonyms 4-Methoxyanisole Hydroquinone dimethyl ether Source Lee, L.-S. Fu, J.-FI. Fisu, Fl.-L. J. Chem. 

---