Di-terf-butyl

Rate law and activation energy. The oxidation of nitrosobenzene by terf-butyl hydroperoxide is catalyzed by di-terf-butyl peroxyoxalate (TBO) and by a cobalt(II) chelate complex. 

Initiators that have been used for these free radical reactions are di-terf-butyl peroxide and 2,2-bis-ferr-butylperoxybutane [166-168]. 

Pyridine is added to neutralize small amounts of hydrogen iodide, which is often present in iodotrimethylsilane as a result of hydrolysis by contact with moisture. The amount of by-products, including cyclohexyl iodide, is reduced by the presence of pyridine. Hindered pyridine bases such as 2,6-di-terf-butyl-4-methylpyridine" have also been used for this purpose by the submitters. The pyridine bases do not appear to react with iodotrimethylsilane. 

Di-terf-butyl malonate, 59, 66 Di-tert-butyl peroxide, 55, 61... 

Di-terf-butyl malonate is available commercially either directly from Fluka AG, Buchs, Switzerland, or from its North American representative, Tridom Chemical Inc. Alternatively this compound may be prepared from malonic acid. ... 

Di-(ert-butyl malonate Malonic acid, di-terf-butyl ester (8) Pro-panedioic acid, bis(l,l-dimethylethyl)ester (9) (541-16-2) p-ToIuenesulfonyl azide (8) Benzenesulfonyl azide, 4-methyl- (9) (941-55-9)... 

The antioxidative activities of polymeric antioxidants prepared from Verona oil and the conventional phenolic antioxidant 3-(3,5-di-terf-butyl-4-hydroxyphenyl)propionic acid (DTBH), chemically grafted to polystyrene and polyurethanes, is similar and in some cases even better than that of the corresponding low-MW phenolic antioxidants [81]. 

Successful strategies for generating complexes of the di(terf-butyl)phosphate ligand primarily focus on the use of H0P(0)(0 Bu)2 as a reagent. As with the related siloxide species, all synthetic manipulations must be performed under inert conditions to avoid hydrolysis of the M - O - P linkages. Complexes of the - 02P(0 Bu)2 ligand are useful precursors to M/P/0 oxide materials. 

Reed, M. Thompson, D. C. Immunochemical visualization and identification of rat liver proteins adducted by 2,6-di-terf-butyl-4-methylphenol (BHT). Chem. Res. Toxicol. 1997, 10, 1109-1117. 

Products from the reaction of N-propionylimidazole with di-terf-butyl acetylene-dicarboxylate at room temperature have a somewhat different structure 1571... 

Dimethylhexane-2,5-di-terf.-butyl peroxide, organic peroxide. 

The molecules in Table 6 may be divided into three groups based on their dihedral angles. For most of these molecules the dihedral angle is close to 60°. In 2,3-di-terf-butyl-1,3-butadiene (2,3-TB) the dihedral angle is close to 90°, corresponding to an approximately perpendicular conformation, while the dihedral angle in 2-tert-butyl- 1,3-butadiene (2-TB) is determined to be 32.1°. 

Mukmeneva, N.A., Cherezova, E.N., and Zhukova, R.S., Reactions of 3,5-di-terf-butyl-4-hydroxybenzyl acetate with trialkyl phosphites, Russ.. Gen. Chem., 64, 947, 1994. 

DBAD = di-terf-butyl azodicarboxylate CbzN = NCbz = dibenzyl azodicarboxylate... 

BIDPhE l,l-Bis[2-(l-methylimidazolyl)]-l-(3,5-di-terf-butyl-4-oxyphenyl) ethane... 

Structural Characterization. The tridentate coordination geometry of di-terf-butyl tin pz, 62a, is evident in the crystal structure (Fig. 10). The Sn-N and S-S bond lengths are larger due to this unusual coordination... 

B = molybdocene(IV) dithiol (70b). The solitaire porphyrazines exhibited rich redox chemistry, and could be oxidized with ferrocenium hexafluorophosphate to yield the paramagnetic Mo(V) species H2[pz(A3B)], A = di -ferf-butyl phenyl, B = molybdocene(V) dithiol (72a) and H2[pz(A3B)], A = dipropyl, B = molybdocene(V) dithiol (72b), which were studied by EPR (Scheme 13). Additionally, 70a was centrally metalated with Cu(II), to form Cun[pz(A3B)], A = di-ferf-butyl phenyl, B = molybdocene(IV) dithiol (71), which was then oxidized to Cun[pz(A3B)], A = di-terf-butyl phenyl, B = molybdocene(V) dithiol (73) and its magnetic properties investigated. 

Additional unsymmetrical porphyrazinols have also been reported. The mixed macrocyclization of the dispiroketal substituted dinitrile (188) with di-terf-butyl phenyl pyrroline (68) gives Mg[pz(AB3)], A = dispiroketal, B = di-terf-butyl phenyl (194) in 30% yield, which can be demetalated with glacial acetic acid to... 

FIGURE 3.17 Reagents for protection of amino groups as the ferf-butoxycarbonyl derivatives. terf-Butyl chloroformate is rarely used because of its low boiling point. The oxime is 2-ferf-butoxycarbonyloximino-2-phenylacetonitrile,45 Boc20 = di-ferf-butyl dicarbonate, or di-terf-butyl pyrocarbonate.46 (Tarbell et al., 1972 Pozdvev, 1974). Acylations are carried out at pH 9 to avoid dimerization. 

Di-terf-butyl 2-thiazolylidenemalonates (1637) were treated with trifluo-roacetic acid in methylene chloride at ambient temperature for 30-40 min to afford equilibrium mixtures of (thiazol-2-ylidene)acetates (1638) and (thiazolin-2-yl)acetates (1639) in 82-100% yields (85AJC745). 

The photochemistry of di-terf-butyl nitroxide was studied149. When di-tert-butylnitroxide (DTBN) is excited at 254 nm to the rnt state in pentane solution, it is cleaved to terf-butyl radical and 2-methyl-2-nitrosopropane (with quantum yield of 0.21). The tert-butyl radical is scavenged by DTBN to give di-ferf-butyl-terf-butoxyamine150 (equation 129). 

Irradiation at the DTBN-chloroform charge-transfer absorption yields151 285 ( = 1.01), 287 (4> = 0.6), terf-butyl chloride (4> = 0.06), isobutylene (tfi = 0.99) and di-terf-butyl (dichloromethoxy) amine 288 (4> = 0.56) (equation 131). Also151, irradiation of DTBN at 300 nm in methylene chloride gives 2-methyl-2-nitrosopropane and di-terf-butyl-terf-butoxyamine (

products characteristic of the locally excited (mi ) state, and also 2-methyl-2-nitrosopropane (

terf-butyl chloride (

terf-butyl (chloromethoxy) amine 289 (

charge-transfer state. 

Indeed a limited number of monomeric [Mn(dioxolene)2] complexes have been structurally characterized (M = Ni dioxolene = 3, 6-di-terf-butyl-l,2-benzosemiquinone, n = 0 51a dioxolene = A AT -bis, 3-dihydroxybenzoyl)-l,7-diazaheptane, n = 2 51b dioxolene = 1,2-cate-cholate, n = 2 51c M = Pd, Pt dioxolene = 3,5-di-terf-butyl- 1,2-benzo-semiquinone, n = 052), likely due to the fact that Ni(II) in the presence of... 

As far as the reactivity of these complexes towards molecular oxygen is concerned, it has been observed that the ligand-centred anodic processes become more informative than the metal-centred cathodic processes. This can be seen in Figure 20, which compares the responses of Ir(III)-di-terf-butyl-catecholate in the absence (a) and in the presence (b) of dioxygen. 

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