TFAA/DMSO‐Promoted Fluorination of P(O)−H and P(O)−OH Compounds: Compatible Access to Fluorophosphonates and Phosphonofluoridates
作者:Qi‐Wei Li、Xin‐Yue Zhang、Lu Lu、Zi‐Qian Wu、Ji Li、Gui‐Zhi Li、Kai Sun、Shang‐Dong Yang、Bin Yang
DOI:10.1002/adsc.202101254
日期:2022.3
A TFAA/DMSO/NaF-based system for the efficient fluorination of P(O)−H and P(O)−OH compounds has been developed. Without adding highly toxic and expensive fluorination reagents, this novel transformation provides direct and compatible access to a variety of fluorophosphonates and phosphonofluoridates in a one-pot manner.
The distinctive fluorine effects on “on-water” chemistry have remained less explored. In this work, an “on-water” reaction of β-trifluoromethylated enones with phosphine oxides was developed for the preparation of highly functionalized gem-difluorodienes with excellent Z-selectivity. The reaction occurred through a well-designed tandem phospha-Brook rearrangement and defluorination sequence under
Photoinitiatorsysteme für radikalisch polymerisierbare Materialien
申请人:CIBA-GEIGY AG
公开号:EP0221010A1
公开(公告)日:1987-05-06
Photopolymerisierbare Zusammensetzungen aus (a) einem radikalisch polymerisierbaren Material und einer Photoinitiator-Kombination aus (b) einem Ferroceniumsalz und (c) einem Photoinitiator vom Typ der a-Spalter stellen ein System hoher Lichtempfindlichkeit dar und lassen sich zur Herstellung von Schutzüberzügen oder für photographische Aufzeichnungsverfahren verwenden. Als Komponente (c) sind insbesondere aromatische Ketone und Ketale geeignet.
Flame retardant epoxy prepregs, laminates, and printed wiring boards of enhanced thermal stability
申请人:Ranken F. Paul
公开号:US20050075024A1
公开(公告)日:2005-04-07
Boehmite (alumina monohydrate) when used with a typical epoxy resin advanced with phosphorus makes it possible to improve thermal stability and to increase the ignition time of laminates formed from prepregs made using this fortified resin. Such laminates have exceptionally high thermal stability and showed similar longer times to ignition as compared to corresponding resins in which alumina trihydrate was used.