Benzene-1, 2-diol

Magneson. 4- (4-Nit rophen yl)azop 1,3-benzene-diol 4-(p-rtitrophenylazo)resorcinot 2,4-dihydroxy-4 -ni-troazobenzene. Cl2H,N304 mol wt 259 22. C 55.60%, H... 

Duffley RP, Handrick GR, Uliss DB, Lambert G, Dalzell HC, Razdan RK (1980) Synthesis of 2 - and 3 -Acetoxyolivetols [5-(2- and 3-Acetoxypentyl)-1,3-benzene Diols] Key Intermediates in the Synthesis of Tetrahydrocannabinol Derivatives. Synthesis 733... 

Chemical Name 4,4 -[1,6-hexanediylbis[imino(1-hydroxy-2,1-ethanediyl)] ] bis-1,2-benzene-diol... 

HydroxyphenyD-l-me thy lpropy1]amino]ethyl]-l,2-benzene diol, hydrochloride... 

The pattern for outer-sphere oxidation by Co(NH3)5 compared with Co(en)j+ (usually it is —10 times slower) towards inorganic reductants can be used to support an estimate of the proportion of electron transfer (Marcus-dependent) and charge transfer which Ru(bpy) + displays towards these oxidants (45 and 11%, respectively). Sec. 2.2.1(b). Finally, Eqn. 5.35 can be used to determine K 2 for a reaction in which the other kinetic parameters are known. The value of A, 2 can be used, in turn, to estimate the oxidation potential of one couple, which is normally inaccessible. Thus the potentials of the o-, m- and /7-benzene diol radicals 1T2A4 were determined from kinetic data for the oxidation of the diols (H2A) by Fe(phen) + (5.45) ... 

Properties A polymer consisting of 1,4-benzene-diol, 2-(l,l-dimethylethyl)-polymer with diethyl-... 

Dalloro, L., Cesana, A., Buzzoni, R. and Rivetti, F. (2004) Process for the preparation of phenol by means of the hydrodeoxygenation of benzene-diols. Furopean Patent FP 1411038 to Polimeri Furopa. 

Gentfeyl Alcohol, 2.(Hydroxyrnrihyl -l,4-benzene-diol 2,5-dihydroxybenzy alcohol. C7HB03 mol wt 140.13. C 60.00%, H 5.75%, O 34.25%. A metabolic product of Penici/frum patulum Birkinshaw et al, Biochem J. 37, 726 (1943) Brack, Helv. Chim Acta 30, I (1947) Tanen baum, Bassett, Biochim Biophys. Acta 28, 21 (1958). Prepn from gentisaldehyde Birkinshaw, loc. cit. 

Di-t-butylbenzene-1,4-diol 2,5-Di-t-butyl-1,4-benzene-diol 2,5-Di-t-butyl-1,4-benzohydroquinone 2,5-Di-t-butyl-1,4-hydroquinone ... 

Since the enthalpy of vaporization depends linearly on the number of carbons to a high degree of accuracy [6], it is fair to suggest benzene, toluene, ethylbenzene (and the isomeric xylenes), form a homologous series, at least with respect to this property. The set of compounds benzene, phenol, and the various benzene-diols wherein an increasing number of hydroxy substituents putatively defines a homologous series might also define a linear relationship. 

Tobacco extraction with a hexane-ethanol azeotrope selectively reduced the levels of 1,2-benzenediols (catechols) in the cigarette MSS. Tobacco extraction with a polar organic solvent system (aqueous ethanol or aqueous methanol) removes chlorogenic acid, a known major precursor of 1,2-benzene-diol (catechol), a phenol categorized as a cocarcinogen. 

Photoinduced Charge Transfer Osmylation. The reaction of osmium tetroxide with benzenoid derivatives can only be accomplished by irradiation of the mixture. This reaction had previously been shown to work (with stoichiometric osmium tetroxide) by promotion of charge transfer between the two reactants to form an ion-pair this can then collapse to form an osmate ester of benzene diol. Subsequent dihydroxylation of this intermediate appears to follow a more conventional (and stereoselective) course. The use of catalytic osmium tetroxide (in conjunction with barium perchlorate as a reoxidant) for this reaction is noteworthy, as is the formation of both inositol and conduritol derivatives in one-pot (eq SS). The photoinduced osmylation of mono-substituted arenes was possible although the yields were lower and the amount of cyclitol-type products reduced. 

I-Me ether [159686-24-5]. I- 3-Ethyl-2,4-dihydroxy-6-methoxyphenyl)-1-butanone. 2-Ethyl-5-methoxy-4- l-oxobutyl)- , 3-benzene diol C13H18O4 M 238.283 Metab. of Phoma etheridgei. Solid. 

Kreppenhofer S., Frank O., Hofmann T. Identification of (furan-2-yl)methylated benzene diols and triols as a novel class of bitter compounds in roasted coffee. Food Chemistry, 126 441-449 (2011). 

Electron transfer rates between adrenaline and related benzene diols and complexes of iron(III) with some substituted 1,10-phenanthrolines have been reported [67] in surfactant systems. In cationic systems the reactions take place in the aqueous phase and reaction rates are lower than they are in simple aqueous systems, but in anionic surfactant systems the reaction rates are enhanced, reactions probably taking place at the micellar interface. The rates of exit and entrance of aromatic compounds from and into micelles have recently been studied using phosphorescence decay measurements [68] exit rate constants of aromatic hydrocarbons are of the order of 10 to 10 s " S whereas values of 10 to 10 (moll ) s have been reported for intramicellar energy transfer processes. Release of aromatic phosphorescence probes from micelles followed by their deactivation in the aqueous phase is hence expected to be an important mode of deactivation of the triplet state [69]. Kinetic schemes for triplets that are partitioned between aqueous and micellar phases are considered for the cases of single occupancy and double occupancy of the micellar units. 

Izumikawa, M., Khan, S.T., Komaki, H., Nagai, A., Inaba, S., Takagi, M., and Shin-Ya, K. (2009) JBIR-37 and -38, novel glycosyl benzene-diols, isolated from the sponge-derived fungus, Acremonium sp. SpF080624GlfDl. Biosci Biotechnol Biochem., 73, 2138-2140. 

The carbonylation of 2-methyl-3-butyn-2-oI (50) in benzene gives teraconic anhydride (51). Fulgide (53) (a dimethylenesuccinic anhydride derivative), which is a photochromic compound, can be prepared by the carbonylation of 2,5-dimethyl-3-hexyne-2,5-diol (52)[21], The reaction proceeds under milder conditions when PdlOAc) is used as a catalyst in the presence of iodine [23],... 

Diols that bear two hydroxyl groups m a 1 2 or 1 3 relationship to each other yield cyclic acetals on reaction with either aldehydes or ketones The five membered cyclic acetals derived from ethylene glycol (12 ethanediol) are the most commonly encoun tered examples Often the position of equilibrium is made more favorable by removing the water formed m the reaction by azeotropic distillation with benzene or toluene... 

One of the first attempts to produce polyurethane was from the reaction of an intermediate polyol of 1,3- and l,4-bis(hydroxyhexa uoroisopropyl)benzene m- and -12F-diols) by reaction with epichlorohydrin. This polyol was subsequentiy allowed to react with a commercial triisocyanate, resulting in a tough, cross-linked polyurethane (129,135,139). ASTM and military specification tests on these polyurethanes for weather resistance, corrosion prevention, bUster resistance, and ease of cleaning showed them to compare quite favorably with standard resin formulations. 

A number of steroids have been regioselectively acylated ia a similar manner (99,104). Chromobactenum viscosum hpase esterifies 5a-androstane-3P,17P-diol [571-20-0] (75) with 2,2,2-triduoroethyl butyrate ia acetone with high selectivity. The hpase acylates exclusively the hydroxy group ia the 3-position giving the 3P-(monobutyryl ester) of (75) ia 83% yield. In contrast, bacillus subtilis protease (subtihsia) displays a marked preference for the C-17 hydroxyl. Candida iylindracea]i 2Lse (CCL) suspended ia anhydrous benzene regioselectively acylates the 3a-hydroxyl group of several bile acid derivatives (104). 

DMSO, molybdenum peroxide, benzene, reflux, 7-20 h, 60% yield. This method was used to m onoprotect 1,2-diols. The method is not general because oxidation to a-hydroxy ketones and diketones occurs with some substrates. On the basis of the mechanism and the results it would app>ear that overoxidation has a strong conformational dependence. 

Physalien (all trans /J-carotene-3,3 -diol dipalmitate) [144-67-2] M 1044, m 98.5-99.5°, A (Xmax) 1410 (449nm), 1255 (478nm) in hexane. Purified by chromatography on water-deactivated alumina, using hexane/diethyl ether (19 1) to develop the column. Crystd from benzene/EtOH. Stored in the dark, in inert atmosphere, at 0°. 

---