通过双分子合成法合成了(CTA)1/3 [Cu 46(C 9 H 3 O 6)24(OH)12 ](PW 12 O 40)3 ·xH 2 O(COK-15b)的新材料MOF。模板方法,在无溶剂条件下,以化学计量比将季戊四醇与脂肪酸酯化为相应的季戊四醇四酯时,具有很高的活性和选择性,并具有高达98%的收率。通过TEM,SEM,TG,BET,TPD和Py-IR对COK-15b进行了表征。此外,研究了COK-15b的稳定性,可以将其重复使用5个运行周期而不会出现明显的失活。
Microwave-promoted synthesis of polyolesters for lubrication oil using a composite catalyst in a solvent-free procedure
作者:Fengxiu Zhang、Guangxian Zhang
DOI:10.1039/c0gc00351d
日期:——
rapid, highly efficient and green synthetic approach to polyol esters for lubrication oils is proposed. Using sulfuric acid and p-toluene sulfonic acid as a composite catalyst and C5–C9 straight-chain monocarboxylic acids, with pentaerythritol (PE) and dipentaerythritol (di-PE) as starting materials, a series of lubricationoil polyol esters were synthesized in the absence of solvent under microwave
Efficient Synthesis of Novel Plasticizers by Direct Palladium‐Catalyzed Di‐ or Multi‐carbonylations
作者:Yuya Hu、Rui Sang、Robby Vroemans、Guillaume Mollaert、Rauf Razzaq、Helfried Neumann、Henrik Junge、Robert Franke、Ralf Jackstell、Bert U. W. Maes、Matthias Beller
DOI:10.1002/anie.202214706
日期:2023.2
The first di- and multi-carbonylations of olefins with di- or polyols provide a general and straightforward access to a variety of di- or multiesters with high efficiency and selectivity. Representative diesters show potential performance (Tg) as novel plasticizers.
A composition comprising an aromatic polycarbonate in admixture with a mold release effective amount of an ester of an aliphatic carboxylic acid of 6 to about 9 carbon atoms and a trihydric or tetrahydric alcohol.
A lubricating oil composition which comprises one or more base oils of the group consisting of (A) a mineral oil having a kinematic viscosity of 5-200 m2/s at 40°C and an aromatics content of less than 15 percent by weight, (B) an olefinic polymer of 2-16 carbon atoms or its hydride having a number-average molecular weight of 250-4,000, and (C) an alkylbenzene having 1-4 alkyl groups of 1-40 carbon atoms and a total carbon number of said alkyl groups in the range of 6-40, said base oil or oils being blended with a 3-methyl-5-tert-butyl-4-hydroxyphenyl-substituted fatty acid ester in an amount of 0.1-5.0 percent by weight based on total composition. The inventive lubricant composition having such a base oil in combination with the specified fatty acid ester provides a synergistic effect conducive to inhibition or prevention of both oxidation and sludge formation while in use under elevated temperature conditions over extended periods of time.
A lubricating oil composition comprises (A) a base oil, (B) a 3-methyl-5-tert-butyl-4-hydroxyphenyl substituted fatty acid ester in an amount of 0.1 - 5 percent by mass and (C) an auxiliary component, said auxiliary component being one member of the group of (a) a nitrogen-containing compound in an amount of 0.001 - 1 percent by mass, (b) a sulfur and/or phosphorus-containing compound in an amount of 0.1 - 5.0 percent by mass or (c) a phenolic compound in an amount of 0.1 - 5.0 percent by mass. This composition features the combination with a base oil of these specified components whereby there is provided synergistic effect conducive to inhibition or prevention of both oxidation and sludge formation while in use under elevated temperature conditions over extended periods of time.