15989-00-1

Upstream product

• 599-64-4 p-cumylphenol 
• 88-74-4 2-nitro-aniline 
• 7440-66-6 zinc 
• 98-83-9 isopropenylbenzene 
• 56187-92-9 2-t-butyl-4-(α,α-dimethylbenzyl)phenol 
• 88-18-6 2-tert-Butylphenol 
• 102116-82-5 2-(2'H-benzotrizol-2'-yl)-6-t-butyl-4-(α,α-dimethylbenzyl)phenol 
• 102116-73-4 2-tert-Butyl-4-(1-methyl-1-phenyl-ethyl)-6-(2-nitro-phenylazo)-phenol 

Downstream Products

• 340006-77-1 3,3'-bis-(2H-benzotriazol-2-yl)-5,5'-di-cumyl-1,1'-biphenyl-2,2'-diol 

Relevant academic research and scientific papers

Mono- and bis-benzotriazolyldihydroxybiaryl UV absorbers

Provided is a composition which contains a mono- or bis-benzotriazole compound, an N-oxide thereof, or a mixture of at least two of the preceding compounds. Representative bis-benzotriazole compounds include 3,3′-bis-(2H-benzotriazol-2-yl)-5,5′-di-tert-octyl-1,1′-biphenyl-2,2′-diols. Representative mono-benzotriazole compounds include 3-(2H-benzotriazol-2-yl)-5,5′-di-tert-octyl-1,1′-biphenyl-2,2′-diols. These mono- and bis-benzotriazole compounds are useful as stabilizers of degradable polymers against the degradative action of ultraviolet light. Also provided is a method of making these benzotriazole compounds by oxidative dimerization of the corresponding monomeric benzotriazole or by reductive cyclization of the corresponding azo- compound.

Preparation of Some 2-(2' H-Benzotriazol-2'-yl)phenol Ultraviolet Absorbers: Application of the Transalkylation Reaction

When 2-(2' H-benzotriazol-2'-yl)phenols containing t-alkyl substituents are warmed in toluene solution with an aluminium chloride/nitromethane catalyst, the t-alkyl groups are transferred to the solvent (toluene).This transalkylation reaction has been used to prepare not readily accessible or previously inaccessible 2-(2' H-benzotriazol-2'-yl)phenols, a class of ultraviolet absorbers widely used in industry.