2.4- Di-tert-butylphenol: Phenol, 2,4-bis

Di-tert-butylphenol Phenol, 2,4-di-tert-butyl- (8) Phenol, 2,4-bis(1,1-dimethylethyl)- (9) (96-76-4)... 

Di-tert-butylphenol (2,4-DTBP) or 2,4-bis(l,l-dimethylethyl)phenol is produced by the alkylation of phenol with isobutylene under acid catalysis using a mole ratio of 2 1 (isobutylene to phenol). The cmde product contains 4-/ f2 -butylphenol, 2,4-di-/ f2 -butylphenol, and 2,4,6-tri-/ f2 -butylphenoL The... 

Stack and co-workers recently reported a related jx-rf / -peroxodi-copper(II) complex 28 with a bulky bidentate amine ligand capable of hydroxylating phenolates at - 80 °C. At - 120 °C, a bis(yu,-oxo)dicopper(III) phenolate complex 29 with a fully cleaved 0-0 bond was spectroscopically detected (Scheme 13) [190]. These observations imply an alternative mechanism for the catalytic hydroxylation of phenols, as carried out by the tyrosinase metalloenzyme, in which 0-0 bond scission precedes C - 0 bond formation. Hence, the hydroxylation of 2,4-di-tert-butylphenolate would proceed via an electrophilic aromatic substitution reaction. 

With regards to oxidative reactivity, it seems that dicopper(II) end-on peroxo complexes are basic, or nucleophilic, in nature, without oxidizing substrates such as PPha or 2,4-di-tert-butylphenol. Instead, O2 is released and PPhs binds, or deprotonation of the phenol occurs leading to a Cu -hydroperoxide. By contrast, the side-on bound dicopper(II) peroxide and its isoelectronic isomer, the dicopper(III) bis(p-oxo) species, both are electrophilic and have been shown to react with a wide array of substrates, in intramolecular (ligand) oxidations, and intermolecular organic transformations. Our group has extended the oxidative capability of CU2O2 complexes to novel (for copper chemistry) substrates such as tetrahydrofuran and dimethylaniline, which are oxidized to 2-hydroxy-tetrahydrofuran, and methylaniline plus formaldehyde, respectively. 

UVA 2,2 -dihydroxy-4-methoxybenzophenone 2-(2H-benzotriazol-2-yl)-p-cresol 2-benzotriazol-2-yl-4,6-di-tert-butylphenol phenol, 2-(5-chloro-2H-benzotriazole-2-yl)-6-(1,1 -dimethylethyl)-4-methyl- 2-(2H-benzotriazole-2-yl)-4,6-di-tert-pentylphenol 2-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetraethylbutyl)phenol 2-(2H-benzotriazol-2-yl)-4,6-bis(1 -methyl-1 -phenylethyl)phenol 2-(2H-benzotrlazol-2-yl)-6-dodecyl-4-methylphenol, branched linear 2,4-dl-tert-butyl-6-(5-chloro-2H-benzotrlazole-2-yl)-phenol 2-(3-sec-butyl-5-tert-butyl-2-hydroxyphenyl) benzotrlazole reaction product of methyl 3(3-(2H-benz-otrlazole-2-yl)-5-t-butyl-4-hydroxyphenyl proplonate/PEG 300 ethyl-2-cyano-3,3-dlphenylacrylate (2-ethylhexyl)-2-cyano-3,3-dlphenylacrylate N-(2-ethoxyphenyl)-N -(4-lsododecylphenyl)oxamlde N-(2-ethoxyphenyl)-N -(2-ethylphenyl)oxamlde benzoic acid, 4-[[(methylphenylamlno) methylene]amlno]-, ethyl ester Screeners carbon black ... 

An induction period was observed in the decomposition of cumyl hydroperoxide in chlorobenzene at 70 and 110 °C in the presence of phenolic sulphides CXCVIIa,b262). This was a substantial difference with respect to the behaviour of 4,4 -thio-bis(2,6-di-tert-butylphenol) CLXVIIIb which decomposed ROOH under the same conditions without induction period. The result indicates a mechanistic distinction in the action of both types of phenolic sulphides. In the mechanism of transformations of benzyl sulphide CXCVIIb, there are assumed (Scheme 24) the formation of sulphoxide CXCVIII and the intermediary formation of CIC followed by oxidation and formation of sulphinic acid CC. Further transformation of the acid CC depends on the character of R. If R = 3,5-di-tert-butyl-4-hydroxybenzyl, as it is in the formation of CC from CXCVIIa, the total elimination of the sulphurous part of molecule may occur and the transformation products of phenolic or quinoid character may be formed 3,5-di-tert-butyl-4-hydroxybenzyl alcohol XXXI, the corresponding aldehyde XXXII, and 2,6-di-tert-butyl-l,4-benzoquinone XXII were identified. Another possible sulphurless product is 4,4 -ethylenebis(2,6-di-tert-butyl-phenol) XXVIII, which was isolated in small amounts in its oxidized form as 3,5,3 ,5 -tetra-tert-butyl-4,4 -stilbenequinone (XXIX). Quinone methide XXX formed by thermolysis of sulphoxide CXCVIII, may be also the precursor in formation of XXIX. According to66), XXX is further oxidized by hydroperoxides to XXIX... 

This reaction sequence was applied to 2-methyl-6-tert-butylphenol, and it was found that bis (3-methyl-4-hydroxy-5-tert-butylbenzyl) sulfide can be produced in an over-all yield greater than 90% in pilot-plant scale reactions. Since the reaction mother liquor, after removal of the product, contains sodium dimethyldithiocarbamate, it can be recycled and neutralized, thus regenerating carbon disulfide and dimethylamine for reuse in preparing the intermediate. In essence, therefore, the over-all reaction consumes only 2,6-dialkylphenol, formaldehyde, and sodium sulfide. The scope of this reaction sequence was demonstrated by preparing bis (3,5-dialky 1-4-hydroxy benzyl) sulfides from a number of phenols ranging from 2,6-dimethylphenol to 2,6-di-ferf-butylphenol (20). 

The concept of using group I metal initiators was applied in order to minimize the toxicity generated by heavy metal residues in the end product PLAs when using metals like aluminum, tin, and lanthanides as initiators. In recent years, dinuclear lithium and macro-aggregates with phenolate ligands have attracted substantial interest, mainly due to uncommon strucmral feamres and their ability to catalyze formation of polyester and various other polymeric materials via ROP [28]. A series of lithium complexes supported with 2, 2-ethylidene-bis (4, 6-di-tert-butylphenol) (EDBP-H2) 2-6, (Scheme 6) are excellent initiators for the ROP of L-lactide in CH2CI2 at 0 °C and 25 °C [33-35]. In this case, the PDIs of the obtained PLAs were quite narrow (1.04—1.14) and a Unear relationship between and the monomer-to-initiator ratio ([M]o/[I]o) existed at 0 °C. Dimeric complexes 4 and 6 were the... 

Beilstein Handbook Reference) Annulex PBA 15 Antage W300 Anullex PBA 15 BBM 1,1-Bis(2-methyl-4-hydroxy-5-tert-butylphenyl)butane 6,6 -Di-tert-butyl-4,4 -butylidenedi-m-cresol BRN 2016567 4,4 -Butylidene bis(6-tert-butyl-3-methylphenol) 4,4 -Butyl-idenebis(3-methyl-5-tert-butylphenol) 4,4 -Butylidene-bis(6-tert-butyl-m-cresol) CCRIS 4915 m-Cresol, 4,4 -butylidenebis(6-tert-butyl- EINECS 201-618-5 HSDB 5250 Noclizer NS 30 NSC 67485 Phenol, 4,4 -butylidenebis(2-(1,1-dimethylethyl)-5-methyl- Santo-white Santowhite powder Sumilit bbm Sumilizer BBM ... 

UVA 2-hydroxy-4-octyloxybenzophenone 2-hydroxy-4-methoxybenzophenone 2-(2H-benzotriazol-2-yl)-p-cresol 2-(2H-benzotriazole-2-yl)-4,6-di-tert-pentylphenol 2-(2H-benzotriazole-2-yl)-4-(1,1,3,3-tetraethylbutyl)phenol 2,4-di-tert-butyl-6-(5-chloro-2H-benzotriazole-2-yl)-phenol 2-[4,6-bis(2,4-dimethylphenyl)-1,3,5-triazin-2-yl]-5-(octyloxy) phenol ethyl-2-cyano-3,3-diphenylacrylate HAS 1,3,5-tri-azine-2,4,6-triamine, N,N [1,2-ethane-diyl-bis[[[4,6-bis[butyl-(1,2,6,6-pentamethyl-4-piperidinyl)amino]-1,3,5-triazine-2-yl] imino]-3,1 -propanediyi] bis[N ,N -dibutyl-N ,N -bis(1,2,2,6,6-pentamethyl-4-piperidinyl)- bis(2,2,6,6-tetramethyl-4-piper-idyl) sebacate 2,2,6,6-tetramethyl-4-piperidinyl stearate N,N -bisformyl-N,N -bis-(2,2,6,6-tetramethyl-4-piperidinyl)-hexamethylendiamine alkenes, C20-24-.alpha.-, polymers with maleic anhydride, reaction products with 2,2,6,6-tet-ramethyl-4-piperidinamine 1,6-hexanediamine, N, N -bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymers with 2,4-di-ohloro-6-(4-morpholinyl)-1,3,5-triazine 1,6-hexanediamine, N,N -bis(2,2,6,6-tetramethyl-4-piperidinyl)-, polymers with morpholine-2,4,6-trichloro-1,3,5-triazine reaction products, methylated Phenolic antioxidants ethylene-bis(oxyethylene)-bis(3-(5-tert-butyl-4-hydroxy-m-tolyl)-propionate) 2,6,-di-tert-butyl-4-(4,6-bis(octylthio)-1,3,5,-triazine-2-ylamino) phenol pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate) 2-(1,1 -dimethylethyl)-6-[[3-(1,1 -dimethylethyl)-2-hydroxy-5-methylphenyl] methyl-4-methylphenyl acrylate isotridecyl-3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate 2,2 -ethylidenebis (4,6-di-tert-butylphenol) 2,2 -methylenebis(4-ethyl-6-tertbutylphenol) 3,5-bis(1,1-dimethyethyl)-4-hydroxy-benzenepropanoic acid, C13-15 alkyl esters phenol, 4-methyl-, reaction products with dicyclopen-tadiene and isobutene Phosphite trinonylphenol phosphite isodecyl diphenyl phosphite... 

Phenolic antioxidants including dicresylol propane and Santonox R ((4-4, -thio-bis-(3-napthyl-6-tert butyl phenol Phenolic antioxidants including Succonox 18, butylated hydroxy toluene, lonol, (2,6-di-tert butyl-p-cresol). Nonox Cl (N-N di-beta napthyl-p-phenylenediamine, Santonox R (4,4 thio-bis-3 methyl-6-tert-butylphenol) Phenolic antioxidants including Agerite Alba ((hydroquinone monobenzyl ether), Agerite Spar (styrenated phenol),... 

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