Low-temperature oxidation of 3,6-di-tert-butyl-o-benzoquinone and 3,6-di-tert-butylpyrocatechol with tert-butyl hydroperoxide in the presence of aluminum, titanium, and zirconium tert-butylates
摘要:
Systems consisting of metal (Al, Ti, Zr) tert-butylate and tert-butyl hydroperoxide oxidize 3,6-ditert-butyl-o-benzoquinone under mild conditions (room temperature, benzene). With (t-BUO)(3)Al and (t-BUO)(4)Zr, the major reaction products are 5-hydroxy-3,6-di-tert-butyl-2,3-epoxy-p-benzoquinone, and with (t-BUO)(4)Ti, 2-hydroxy-3,6-di-tert-butyl-p-benzoquinone. Under the conditions of this reaction, 3,6-di-tert-butylpyrocatechol initially transforms into 3,6-di-tert-butyl-o-benzoquinone. The reactions involve metal-containing peroxides.
Reactions of hydroxyl-containing compounds with tert-butyl hydroperoxide in the presence of chromium tetra-tert-butoxide
摘要:
Primary and secondary aliphatic, alkylaromatic, cyclic, and organoelement alcohols are efficiently oxidized by tert-butyl hydroperoxide in the presence of both equimolar and catalytic quantities of chromium tetra-tert-butoxide (D(6)De(6), 20A degrees D). alpha-Diols containing tertiary hydroxyl groups interact with this system via oxidative splitting of the carbon scaffold. The oxidation includes the stages of formation and decomposition of chromium-containing peroxy compounds. Further transformations of the carbonyl compounds depend on the structure of radicals in the molecules.
Tin(IV) complexes based on 2-hydroxy-3,6-di-tert-butyl-para-benzoquinone: Syntheses, structures, and electrochemical behavior in solution
摘要:
A series of new tin(IV) complexes based on 2-hydroxy-3,6-di-tert-butyl-para-benzoquinone (LH) of the general formula L2SnR2 (R = Me (I), Et (II), Bu-n (III), Ph (IV)) and LSnMe3 (V) were synthesized. The obtained compounds were characterized by IR and H-1, C-13 and Sn-119 NMR spectroscopy and elemental analysis. The X-ray diffraction analysis was carried out for complexes L2Sn(Bu-n)(2) (III) and LSnMe3 (V). The low-frequency region of the IR spectra, which has not earlier been studied in detail, was interpreted for compounds I-V and previously described complex LSnPh3 (VI). The electrochemical properties of LH and related tin complexes I-VI were studied. The nature of the hydrocarbon groups at the metal atom affects the stability of the intermediates formed in the electrochemical reactions.
Dye-sensitized and nonsensitized photooxygenation of 3,5-di-t-butylpyrocatechol (1), 2,5-di-t-butylhydroquinone (14), their monomethyl ethers 4 and 20, and dimethyl ethers 5 and 21 has been investigated. In methanol, 1 and 4 undergo oxidative ring cleavage to give a lactonic acid 2 and/or its methyl ester 3. This represents a model for the enzymatic cleavage of phenolic rings. Under similar conditions
Reactions of isomeric 3,6- and 3,5-di-tert-butyl-ortho-benzoquinones with NH3
作者:V. B. Vol'eva、T. I. Prokofeva、A. I. Prokofev、I. S. Belostotskaya、N. L. Komissarova、V. V. Ershov
DOI:10.1007/bf01151298
日期:1995.9
(NH4)2CO3 in a solid phase has been studied. Redox processes with participation of a nucleophile of the medium take place for1, while2 reacts with NH3 at the carbonyl group with transformation of the quinoneimide. The mechanism of redox transformation of1 has been proposed.
Synthesis of sterically hindered benzoquinone methacrylates
作者:M. P. Shurygina、O. V. Markina、N. O. Druzhkov、T. I. Kulikova、A. V. Cherkasov、A. V. Piskunov、S. A. Chesnokov、V. K. Cherkasov
DOI:10.1007/s11172-012-0165-8
日期:2012.6
Sterically hindered p- and o-benzoquinone methacrylates, viz., 2,5-di(tert-butyl)-3,6-di-oxocyclohexa-1,4-dienyl methacrylate and 2,5-di(tert-butyl)-3,4-dioxocyclohexa-1,5-dienyl methacrylate, were synthesized by O-acylation of the lithium and tetrabutylammonium salts of 3,6-di(tert-butyl)-2-hydroxy-p-benzoquinone with methacryloyl chloride. The influence of the nature of cation and solvent on regioselectivity of the acylation was studied. The o-benzoquinone derivative obtained can serve as a paramagnetic ligand in metal complexes.
Coordination polymers based on CuII and MnII complexes with 2-hydroxy-3,6-di(tert-butyl)-1,4-benzoquinone
作者:E. Yu. Fursova、V. I. Ovcharenko、E. V. Gorelik、G. V. Romanenko、A. S. Bogomyakov、V. K. Cherkasov、G. A. Abakumov
DOI:10.1007/s11172-009-0148-6
日期:2009.6
The reactions of MnII and CuII ions with deprotonated 2-hydroxy-3,6-di(tert-butyl)-1,4-benzoquinone (L) afford bis(chelates) ML2. In the solid phases of the compounds, the coordinated ligands L perform the bridging function leading to the formation of polymer structures: layered in MnL2 and framework in CuL2. In the coordination units ML2 the chelate fragments are in the trans and cis positions relative
A bleaching composition comprising: (a) hydrogen peroxide or a peroxide which generates hydrogen peroxide in an a aqueous solution thereof and (b) an organic peracid precursor which generates an organic peracid represented by general formula (I) upon reacting with component (a). In formula (I), wherein R1 represents a straight-chain or branched C1 to C5 alkyl or alkenyl group; R2 represents a straight-chain or branched C1 to C8 alkylene group, or a phenylene group which may be substituted with a straight-chain or branched C1 to Cs alkyl group; nA groups may be the same or different from one another and each represents a C2 to C4 alkylene group; and n is a number of 0 to 100.