Lipolytic activity of porcine pancreas lipase on fatty acid esters of dialkylglycerols: a structural basis for the design of new substrates for the assay of pancreatic lipases activity
摘要:
For the design of new synthetic substrates for the assay of pancreatic lipases activity, acyl dialkylglycerols of variable chain length were prepared. Titrimetric assay of these substrates showed the highest lipolytic activity of porcine pancreas lipase (pPL) with butanoyl dibutylglycerol. The activity is lower but comparable to that shown by pPL towards the classical substrate tributyrin. The 4-nitrophenylcarbonate of 1,2-di-O-butylglycerol, has been prepared and proposed as synthetic substrate for a new spectrophotometric assay of pancreatic lipases. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.
New polyol ether compounds and a process for their preparation. The process comprises reacting a polyol, a carbonyl compound, and hydrogen in the presence of hydrogenation catalyst, to provide the polyol ether. The molar ratio of polyol to carbonyl compound in the process is greater than 5:1.
Dimethyl sulfoxide as a solvent in the Williamson ether synthesis
作者:Russel G. Smith、Alan Vanterpool、H. Jean Kulak
DOI:10.1139/v69-325
日期:1969.6.1
prepared from sodium hydroxide, n-butyl alcohol, and n-butyl chloride using excess of the alcohol as solvent in 61% yield after 14 h reaction time. However, when the excess alcohol was replaced by dimethyl sulfoxide, the yield of ether rose to 95% with 9.5 h reaction time. Other primary alkylchlorides exhibited similar behavior to n-butyl chloride, but secondary alkylchlorides and primary alkyl bromides
The present invention generally relates to a process for making polyol ethers by reacting a polyol and a carbonyl compound together in the presence of hydrogen gas and a palladium hydrogenation catalyst on an acidic mesoporous carbon support.
Heterogeneous catalytic conversion of glycerol with n-butyl alcohol
作者:V. O. Samoilov、D. N. Ramazanov、A. I. Nekhaev、A. L. Maksimov
DOI:10.1134/s0965544116010060
日期:2016.2
The etherification of glycerol with n-butyl alcohol at 140°C in the presence of sulfonated cation-exchange resins and zeolite catalysts in an autoclave reactor has been studied. It has been shown that styrene—divinylbenzene ion-exchange resins are effective catalysts for the production of glycerol n-butyl ethers: the glycerol conversion is about 98% with an n-butyl ether selectivity of about 88 mol
Anti-Reflective Coating for Photolithography and Methods of Preparation Thereof
申请人:Baldwin Teresa
公开号:US20140227538A1
公开(公告)日:2014-08-14
Anti-reflective coating materials for ultraviolet photolithography include at least one absorbing compound and at least one material modification agent, such as at least one porogen, at least one high-boiling solvent, at least one capping agent, at least one leveling agent, at least one catalyst, at least one replacement solvent, at least one pH tuning agent, and/or a combination thereof that are incorporated into inorganic-based materials or inorganic compositions and/or compounds. Suitable absorbing compounds