2.6- Di-tert-butyl-4-methoxyphenol

C15H22 1 -(1,5-dimethyl-4-hexenyl)-4-methy benzene 644-30-4 565.39 50.201 2 28772 C15H2402 2,6-di-tert-butyl-4-methoxyphenol 489-01-0 523.15 46.113 2... 

Relative finh values to BHT = 1.82 x 10" M s determined under the same conditions taken from Reference 152. The stoichiometric factor, n, determined compared to 2,6-di-tert-butyl-4-methoxyphenol, equals 2. 

A new C-allyl cardano 1 derivative formed by Claisen rearrangement of an allyl ether namely, 2-allyl-3n-pentadecyl-6-tert-butylphenol had comparable antioxidant properties to the well known compounds DBHA and BHT, respectively 2,6-di-tert-butyl-4-methoxyphenol and 2,6-di-tert-butylphenol [252], The 2-allyl compound is related in properties to the precursor 2-tert-butyl-5n-pentadecylphenol (see, e.g. p. 542 in ref.[l] and [253] and to the hindered phenols [254],... 

The dihydric phenols are speciality products widely used industrially and commercially. Hydroquinone and its relative, 4-methylaminophenol (metol) are the main chemicals used for development in black and white photography. Butylated hydroxyanisole, (BHA) mainly 2,6-di-tert-butyl-4-methoxyphenol (5), an important food antioxidant is synthesised from 2,4,6-tri-t-butylphenol by reaction in methanolic solution with chlorine to give 2,4,6-tri-t-butyl-4-methoxy-... 

Tribromo-m-cresol is oxidized by chromium trioxide in 70% acetic acid at 70-75 °C within 10 min to dibromo-m-toluquinone (3,5-dibromo-2-methyl-p-benzophenone) in 77% yield [559]. 2-BVomo-4-hy-droxy-5-methoxybenzyl alcohol treated with Fremy salt at pH 6 at room temperature for 1 h gives an 84% yield of 2-bromo-5-methoxy -benzo-quinone [487]. 4-Benzyl-2,6-dibromophenol, on oxidation with bromine in a sealed tube, yields 2,6-dibromophenylchinomethide [732] (equation 312). The oxidation of 2,5-di-tert-butyl-4-methoxyphenol with mercuric oxide or... 

Phenols usually serve as radical inhibitors in conventional radical polymerization but can enhance the polymerizations of MMA with 1-21 (X = Br)/CuBr/ L-9 (R = n-Pen).231 For example, on addition of 10 equiv of 2,6-di-tert-butyl-4-methylphenol with respect to initiator ([1-21] [CuBr] [L-9] [phenol] = 1 3 1 10), the conversion increased from 55% to 75% in 4 h in xylene at 90 °C without any changes in the MWDs. Similar effects were observed for 4-methoxyphenol, phenol, and 2,6-di-ZerZ-butylphenol.231 233 No inhibition but enhancement of the polymerization by the addition of phenols may suggest that the growing species is different from that in conventional radical polymerization. However, phenols do not act as... 

The widely used antioxidant and food preservative called BHA (butylated hydroxyanisole) is actually a mixture of 2-rert-butyl-4-methoxyphenol and 3-tert-hutyl-4-methoxyphenol. BHA is synthesized from A>-methoxyphenol and 2-methylpropene. (a) Suggest how this is done, (b) Another widely used antioxidant is BHT (butylated hydroxytoluene). BHT is actually 2,6-di-rerr-butyl-4-methylphenol, and the raw materials used in its production are /)-cresol and 2-methylpropene. What reaction is used here ... 

---