Novel hydroxyaryl phosphine oxides, glycidyl ethers and epoxy compositions, composites and laminates derived therefrom
申请人:——
公开号:US20040121990A1
公开(公告)日:2004-06-24
The invention provides new compositions of matter that are capable of forming cross-linked polymeric materials upon reaction with various known epoxy-containing compositions. Thus, the compositions of this invention are useful in the manufacturing of prepregs and laminates for PWB applications among many other uses. Preferred compositions of this invention include substituted hydroxyarylphosphine oxide mixtures, the glycidyl ether derivatives, or the epoxy resin oligomer adducts derived therefrom. The materials provide for laminates that have higher glass transition temperatures, improved thermal stability, and that are free of halogen.
Copper‐Catalyzed α,β‐Regioselective (2+4) Cycloaddition of Propargylic Esters
作者:Guo‐Ke Zhang、Shu‐Fang Wu、Chen Zhong、Yu‐Qi Liu、Da‐Hua Wang、Yu‐Chen Zhang、Feng Shi
DOI:10.1002/ejoc.202300802
日期:2023.12.6
A copper-catalyzed α,β-regioselective (2+4) cycloaddition of propargylic esters with o-hydroxyphenyl substituted secondary phosphine oxides (SPOs) was established, which afforded phosphorus-containing six-membered heterocycles in high yields. This reaction not only represents the first α,β-regioselective (2+n) cycloaddition of propargylic esters via the intermediates of copper-allenylidenes, but also