75169-17-4Relevant academic research and scientific papers
Novel phenolic antioxidant-functionalized dendritic polyethylene: Synthesis by tailor-made nickel(II) α-diimine-catalyzed copolymerization and its characteristics as non-releasing additive
Balzadeh, Zahra,Arabi, Hassan
, p. 68 - 78 (2016/12/30)
This work describes a simple one-pot and controlled synthetic method to generate migration-resistant bio-friendly tailor-made antioxidants through ethylene–sterically hindered phenolic antioxidant (SHPA) copolymerization by coordination polymerization usi
Copper(II) Tetrafluoroborate-Catalyzed Acetylation of Phenols, Thiols, Alcohols, and Amines
Chakraborti, Asit K.,Gulhane, Rajesh,Shivani
, p. 111 - 115 (2007/10/03)
Copper(II) tetrafluoroborate efficiently catalyzes acetylation of structurally diverse phenols, alcohols, thiols, and amines with stoichiometric amounts of Ac2O under solvent-free conditions at room temperature. Acid-sensitive alcohols are smoothly acetylated without competitive side reactions. The reaction is influenced by the steric and electronic factors associated with the substrate as well as the anhydride. Acetylation of a sterically hindered substrate requires excess of anhydride and longer time. Acylation with less electrophilic anhydrides affords poor to moderate yields.
Zirconiuni(IV) chloride as a new, highly efficient, and reusable catalyst for acetylation of phenols, thiols, amines, and alcohols under solvent-free conditions
Chakraborti, Asit K.,Gulhane, Rajesh
, p. 627 - 630 (2007/10/03)
Zirconium(IV) chloride has been found to be a new, highly efficient, and reusable catalyst for acetylation of structurally diverse phenols, thiols, amines, and alcohols under solvent-free condtions. Acetylation of sterically hindered and electron deficient phenols is achieved in excellent yields with stoichiometric amounts of Ac2O at room temperature. Acid-sensitive alcohols undergo acetylation with excellent chemoselectivity without competitive side reactions such as dehydration or rearrangement. The mild Lewis acid property of the catalyst enables the acetylation to be carried out with optically active substrates without any detrimental effect on the optical purity.
Design and synthesis of 4,6-di-tert-butyl-2,3-dihydro-5-benzofuranols as a novel series of antiatherogenic antioxidants
Tamura, Kunio,Kato, Yashiaki,Ishikawa, Akira,Kato, Yasuhara,Himori, Motomu,Yoshida, Mitsutaka,Takashima, Yoshiaki,Suzuki, Tsukasa,Kawabe, Yoshiki,Cynshi, Osamu,Kodama, Tatsuhiko,Niki, Etsuo,Shimizu, Makoto
, p. 3083 - 3093 (2007/10/03)
Antioxidants have been considered as potential antiatherogenic agents by inhibiting oxidation of low-density lipoprotein (LDL), albeit vitamin E, a natural antioxidant, has failed to show reduction on atherosclerosis in clinical trials. We have rationally
Bismuth Oxide Perchlorate as a Highly Efficient Catalyst for Heteroatom Acylation under Solvent-Free Conditions
Chakraborti, Asit K.,Gulhane, Rajesh,Shivani
, p. 1805 - 1808 (2007/10/03)
Bismuth oxide perchlorate efficiently catalyzes the acetylation of structurally diverse phenols, alcohols, thiols, and amines under solvent free conditions. Sterically hindered and electron deficient phenols are acetylated in excellent yields with stoichiometric amounts of Ac2O at room temperature. Acylation of acid-sensitive alcohols is carried out efficiently without competitive side reactions. Optically active substrates are acetylated without any detrimental effect on the optical purity.
Process for preparation of a benzofuran derivative
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Page/Page column 14, (2010/01/31)
An industrially useful process for producing benzofuran derivatives of formula (1) by formylating a compound of formula (2) (where A1 is a protective group), followed by reaction with a compound of formula (4) (where X1 is a halogen atom), then performing a cyclizing reaction and subsequently performing a reaction for hydroxyl group deprotection.
4,6 Di-t-butyl-5-hydroxy-2,3-dihydrobenzothiophene
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, (2008/06/13)
A compound represented by formula (I): STR1 wherein R1 represents a hydrogen atom, a lower alkyl group or an acyl group; R2 and R3, which may be the same or different, each represents a hydrogen atom, an optionally substit
4,6-Di-t-butyl-dihydrobenzofuran-5-ol and its derivatives
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, (2008/06/13)
Compounds represented by the general formula as well as intermediates for the synthesis of thereof: STR1 where R1 is a hydrogen atom or an acyl group; R2 is a lower alkyl group; R3 is a hydrogen atom or a lower alkyl group
threo-3-Alkyl- and -Arylglutamic Acid Derivatives by Michael Additions of Boc-BMI Li-Enolates to 2,6-Di-t-butyl-4-methoxyphenyl Alkenoates On the Diastereoselectivity of the Coupling of Trigonal Centers Involving Heterocyclic Li-Enolates
Suzuki, Keisuke,Seebach, Dieter
, p. 51 - 62 (2007/10/02)
The conjugated esters 5, 6, 8, 9 mentioned in the title are prepared from the corresponding aryl acetate 4 and aldehydes by aldol condensation (direct enoylation of the hindered phenol with the corresponding unsaturated acid chlorides gave only poor yield
SYNTHESIS OF 4-ALKOXY- AND 4-ACYLOXY-2,6-DI-tert-BUTYLPHENOLS AND QUINOL ETHERS BASED ON THEM
Dobronravova, Z. A.,Meshcheryakov, V. I.,Prishchenko, Yu. E.,Gavrilov, L. D.,Vereshchagin, L. I.
, p. 910 - 914 (2007/10/02)
4-Alkoxy- and 4-acyloxy-2,6-di-tert-butylphenols were obtained by the alkylation and acylation of 2,6-di-tert-butyl-p-dihydroxybenzene.With quinone dioximes under oxidizing conditions the products form quinol ethers.
