One-Pot Synthesis of Benzotriazoles and Benzotriazole 1-Oxides by Reductive Cyclization of o-Nitrophenylazo Compounds with Benzyl Alcohol
摘要:
Reductive cyclization of 2-[(nitrophenyl)azophenols 1 with benzyl alcohol and sodium hydroxide afforded 2-(2H-benzotriazol-2-yl)phenols 3 and their 1-oxide 2 in good to excellent yields.
Process for the preparation of novel diol-functionalized UV absorbers
申请人:COUNCIL OF SCIENTIFIC & INDUSTRIAL RESEARCH
公开号:US20020082428A1
公开(公告)日:2002-06-27
The invention pertains to a process for the preparation of a novel UV absorbing diol of the general formula:
1
wherein R
1
is hydrogen, tert-butyl; X
1
is selected the group consisting of hydrogen, halogen, tert-butyl and C
1
to C
12
alkoxy; R
2
is C
1
to C
8
linear or branched alkyl.
The invention pertains to novel UV absorbing diol of the general formula:
wherein R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hydrogen, halogen, tert-butyl and C1 to C12 alkoxy; R2 is C1 to C8 linear or branched alkyl, and to a process for the preparation thereof.
Process for the preparation of bromo-functionalized benzotriazole UV absorbers
申请人:Council of Scientific and Industrial Research
公开号:US06320056B1
公开(公告)日:2001-11-20
The invention also pertains to a process for their preparation of bromo functionalised benzotriazole UV absorber of the general formula 1
wherein R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hydrogen, halogen, tert-butyl and C1 to C12 alkoxy by reacting a benzotriazole having formula 2
wherein R1 is hydrogen, tert-butyl; X1 is selected the group consisting of hydrogen, halogen, tert-butyl and C1 to C12 alkoxy with bromine in the presence of a free radical initiator in a non-polar solvent to produce a bromo functionialized benzotriazole.
申请人:EUTEC NEW MATERIALS TECHNOLOGY (SUZHOU) CO., LTD.
公开号:US20220017474A1
公开(公告)日:2022-01-20
Novel polycyclic compounds, synthesis methods and applications thereof are provided. The compound comprise a plurality of carbocyclic and/or heterocyclic structures having at least one group that emits visible light or fluorescence and at least one ultraviolet and/or visible (blue) light absorbing group covalently bonded to provide stability. The compounds can be used as a light conversion agent, dye, pigment, fluorescence agent, ultraviolet light or blue light absorber, and is applied to optical film, agricultural film, optical disk (disc), optical lens, goggles, skin care, makeup, lighting, coatings, adhesives, light stabilizers, or panels.