4-tert-butylcatechol

Benzyl alcohol (8) Benzenemethanol (9) (100-51-6) 4-tert-Butylcatechol Pyrocatechol, 4-tert-butyl- (8) 1,2-... 

Catecholato complexes of the type trans-[0s(0)2(Rcat)2]2 (Rcat = catechol, 4-methylcatechol, 4-tert-butylcatechol, 4-nitrocatechol) are made from 0s04 and the catechol in alkali or from the catechol and trans-K2[0s(0)2(0H)4]. The pyridine complexes trans-[0s(0)2 (Rcat)(py)2] were obtained from 0s04, pyridine, and the catechol (Rcat = cat, 4-Me-cat) [va9(0s02), -820 cm 1 vs(0s02), —860 cm 1] (255). 

Iron(III) weso-tetraphenylporphyrin chloride [Fe(TPP)Cl] will induce the autoxidation of cyclohexene at atmospheric pressure and room temperature via a free radical chain process.210 The iron-bridged dimer [Fe(TPP)]2 0 is apparently the catalytic species since it is formed rapidly from Fe(TPP)Cl after the 2-3 hr induction period. In a separate study, cyclohexene hydroperoxide was found to be catalytically decomposed by Fe(TPP)Cl to cyclohexanol, cyclohexanone, and cyclohexene oxide in yields comparable to those obtained in the direct autoxidation of cyclohexene. However, [Fe(TPP)] 20 is not formed in the hydroperoxide reaction. Furthermore, the catalytic decomposition of the hydroperoxide by Fe(TPP)Cl did not initiate the autoxidation of cyclohexene since the autoxidation still had a 2-3 hr induction period. Inhibitors such as 4-tert-butylcatechol quenched the autoxidation but had no effect on the decom-... 

Photolysis of Cp M(CO)3, where M = MnorRe, Cp = Cp or Cp ", in the presence of pentane and 4, 4, A, A, 5, 5, 5, 5 -octamethyl-2, 2 = bi-1, 3, 2-dioxaborolane (B2PUI2) resulted in formation of primary pentylboronate ester in yields as high as 95% for the Cp " derivatives. Photolysis of trans-Cp "Re(CO)2(Bpin)2 in pentane produced pentylboronate ester in 100% yields suggesting that Cp M(CO)2(Bpin)2 species are likely intermediates in these syntheses. The analogous oxidative addition of a B-B bond has been observed upon photolysis of CP2WH2 and CatBBCat (Cat = 4-tert-butylcatechol) in benzene yielding Cp2W(Bcat)2. ... 

SYNS 4-tert-BUTYLCATECHOL Qp-tert-BUTYLPYROCATECHOL 4-ten-BUTYLPYROKATECHIN (CZECH) 4-(l,l-DMETHYLETHYL)-l,2-BENZENEDIOL SYNOXTBC... 

Fractionate the amide under reduced pressure, and recrystallise the solid distillate from hexane (m 59 ), C6H6 (m 62°) or C6H6/hexane (m 62-63 ). Store it with 0.05% of 4-tert-butylcatechol. It is used for making water soluble swellable hydrogels. [Beilstein 4 IV 517.]... 

Catechol is also employed for the industrial antioxidant 4-tert-butylcatechol, and its monomethyl ether, guaiacol is used for the production of vanillin (10). This account is by no means a complete summary of the applications of the dihydric phenols more of which have been listed elsewhere (ref. 38). 

Acidification of solutions containing [0s02(Rcat)] or direct treatment of the catechol with OSO4 in acetone gives dark blue, polymeric species [0s0(Rcat)2] nH20, thought to contain Os—O—Os —O- chains (R-cat = 4-methylcatechol, 4-tert-butylcatechol, 3,5-di-rerr-butylcatechol). These are remarkably stable species, unreactive even towards boiling pyridine. ... 

Distil it under vacuum and with 0.0015% of 4-tert-butylcatechol as stabilizer. [Beilstein 21 111/lV 3207.]... 

In poly(ether sulfonejs that are prepared by polycondensation of silylated 4-tert-butylcatechol and 4,4 -difluorodiphenyl sulfone, macrocyclic polymers were obtained to some extent [10]. The cyclic polymers were detected by means of matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. 

Purification of the crude styrene must be carried out at the lowest possible temperature by vacuum distillation, to avoid polymerization as a further measure to suppress the tendency to polymerize, polymerization inhibitors, such as 4-tert-butylcatechol, are added. 

By present routes, catechol arises as a co-product in the synthesis of hydroqui-none from phenol by oxidation with peracids. Catechol is used as an antioxidant, principally for turpentine oil and perfumes. For the latter application, especially in the USA, 4-tert-butylcatechol, obtained by butylation, is used. 

Figure 11 shows cyclic voltammetric i-E curves for (A) Fe(CN)e ", (B) Ru(NH3)e (C) IrCl6 / (D) methyl viologen (MV ) in 1 M KCl, and (E) 4-tert-butylcatechol, and (F) Fe in 0.1 M HCIO4 at a boron-doped nanocrystalline diamond thin film electrode. The potential scan rate (v) was 0.1 V/s. The Ep for these redox systems ranges from... 

To inhibit polymer formation and oxidative degradation during shipment and subsequent storage, an inhibitor TBC (4-tert-butylcatechol), is added. TBC prevents polymerisation by reacting with oxidation products (peroxides forming free radicals) in the presence of a small amount of oxygen. The inhibitor level must be maintained above a minimum concentration at all times which is 4 to 5 ppm. The standard level of TBC is 10 to 15 ppm. 

The model hydrolyzes a cyclic phosphate substrate derived from 4-tert-butylcatechol in a selective manner with cooperative catalysis by a neutral imidazole and an imidazolium ion. 

Interestingly, commercially available styrenes containing 4-tert-butylcatechol as a stabilizer produce the l,3-dihalo-l,3-diarylpropane in excellent yields while freshly distilled styrenes produce only polymerization products. In order to inhibit dihalogenation reaction of aryl aldehydes, reactions with BCI3 must be carried out at 0°C and reactions with BBrj must be carried out at 0°C. Aldehydes containing electron-withdrawing groups such as Cl, F, CN, and NO2 react at a slower rate. 

Kuran and Listos " reported the polymerization of propylene oxide and q/ dohexene oxide (a meso substrate) with ZnEtjl polyhydric phenol (such as 4-tert-butylcatechol), phenol, or 1-phenoxypropan-2-ol. The poly (propylene oxide) formed from these systems contained mostly isotactic dyads (72% m), while the poly(cydohexene oxide) contained mostly syndiotactic dyads (80% r) (Scheme 8). 

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