Structure, thermal stability, antioxidant activity and DFT studies of trisphenols and related phenols

Breaking thiacalix[4]arene into pieces – a novel synthetic approach to higher calixarenes bearing mixed (–S–, –CH2–) bridges

“…Thus, the reaction of 5 with 2,6bis(hydroxymethyl)-p-tert-butylphenol 6 (ref. 12) with PTSA under high-dilution conditions led to calix [5]arene derivative 8 in 47% yield (Scheme 2). Similarly, condensation of 5 with bisphenol 7 (ref.…”

Preparation and performance evaluation of an ester‐bridged antioxidant used as multifunctional additive in ester oil

“…The exploration of high weight antioxidants with multiple antioxidation groups has become a trend to enhance the oxidation resistance of lubricating oils. [13][14][15] A number of amine antioxidants have been investigated and found to improve the antioxidation capacity of ester oils 16,17 ; however, the toxicity of amine derivatives was not eco-friendly. The intramolecular synergisms of phenol and amine groups with or without the sulfur atom were reported and exhibited high-antioxidant effectiveness in lubricating oils.…”

Synthesizing Hindered Structure Poly (p‐Phenylenediamine) by Enzymatic Catalysis and Evaluating Its Antioxidation Mechanism in Biodegradable Castor Oils

“…Antioxidants are a class of important additives that improve the performance of lubricating oils, which can retard or inhibit the aging of lubricating oils (Kreisberger et al, 2016; Yu et al, 2017a). Common lubricating oil antioxidants include amines (Dgachi et al, 2016), phenols (Yu et al, 2017b), and zinc dialkyl dithiophosphate (ZDDP) (Okubo et al, 2017). Among all antioxidants, amines have the advantage of excellent antioxidation performance and contain no sulfur or phosphorus content.…”