PROCESS FOR DOUBLE CARBONYLATION OF ALLYL ALCOHOLS TO CORRESPONDING DIESTERS
申请人:EVONIK DEGUSSA GMBH
公开号:US20170174610A1
公开(公告)日:2017-06-22
The invention relates to a process for doubly carbonylating allyl alcohols to the corresponding diesters, wherein a linear or branched allyl alcohol is reacted with a linear or branched alkanol (alcohol) with supply of CO and in the presence of a catalytic system composed of a palladium complex and at least one organic phosphorus ligand and in the presence of a hydrogen halide selected from HCl, HBr and HI.
PROCESS FOR DOUBLE CARBONYLATION OF ALLYL ETHERS TO CORRESPONDING DIESTERS
申请人:EVONIK DEGUSSA GMBH
公开号:US20170174609A1
公开(公告)日:2017-06-22
The invention relates to a process for doubly carbonylating allyl ethers to the corresponding diesters, wherein a linear or branched allyl ether is reacted with a linear or branched alkanol (alcohol) with supply of CO and in the presence of a catalytic system composed of a palladium complex and at least one organic phosphorus ligand and in the presence of a hydrogen halide selected from HCl, HBr and HI.
Electroreductive hydrogenation of activatedolefins was investigated using the concept of site isolation. It was shown by electrochemical measurements as well as preparative electrolyses that the use of silica gel-supported sulfonic acid (Si-SO3H) promotes the protonation step in electroreductive hydrogenation of activatedolefins without electroreductive destruction at the cathode. On the basis of
Photoinduced Halogen-Atom Transfer by <i>N</i>-Heterocyclic Carbene-Ligated Boryl Radicals for C(sp<sup>3</sup>)–C(sp<sup>3</sup>) Bond Formation
作者:Ting Wan、Luca Capaldo、Davide Ravelli、Walter Vitullo、Felix J. de Zwart、Bas de Bruin、Timothy Noël
DOI:10.1021/jacs.2c10444
日期:2023.1.18
study on the use of N-heterocyclic carbene (NHC)-ligated borylradicals to enable C(sp3)–C(sp3) bond formation under visible-light irradiation via Halogen-Atom Transfer (XAT). The methodology relies on the use of an acridinium dye to generate the boron-centered radicals from the corresponding NHC-ligated boranes via single-electron transfer (SET) and deprotonation. These borylradicals subsequently
Efficient two-step production of biobased plasticizers: dehydration-hydrogenation of citric acid followed by Fischer esterification
作者:Anthony De Bruyne、Wouter Stuyck、Willem Deleu、Jarne Leinders、Carlos Marquez、Kwinten Janssens、Dimitrios Sakellariou、Ruben Ghillebert、Dirk E. De Vos
DOI:10.1039/d2gc04678d
日期:——
We report the production of biobased plasticizers starting from citricacid (CA) by a two-step process comprising dehydration-hydrogenation of CA followed by a Fischer esterification. The use of citricacid based plasticizers is well-known in PVC. However, citrate esters tend to leach out of the PVC material over time. This problem is currently tackled by acetylating the tertiary hydroxyl group of
我们报告了从柠檬酸 (CA) 开始生产生物基增塑剂的过程,该过程包括 CA 的脱水-氢化,然后是 Fischer 酯化。基于柠檬酸的增塑剂的使用在PVC中是众所周知的。然而,随着时间的推移,柠檬酸酯往往会从 PVC 材料中浸出。这个问题目前通过复杂和环境污染的过程乙酰化 CA 的叔羟基来解决。我们的替代策略包括去除叔羟基,从而产生丙烷-1,2,3-三羧酸 (PTA)。首先,使用 Al 2 (SO 4 )在相对温和的反应条件(150 °C 和 20 bar H 2)下进行大量 CA (20 mmol) 的脱水反应3作为均相催化剂,水作为绿色溶剂。催化系统被证明在时间上和在其他有机官能团(例如具有不同官能团的氨基酸、二酸)存在下是稳健的在第二步中,将反应混合物转移到 Dean-Stark 装置中,以便与正丁醇进行 Fischer 酯化反应,在此期间可以回收之前使用的 Al 2 (SO 4 ) 3