免费大片一级a一级久久三,亚洲国产成人av在线播放,中文字幕日韩专区,欧美国产日本高清,久久久久亚洲AV无码网站,人妻AV无码系列,粗大的内捧猛烈进出小视频,玩两个丰满老熟女,亚洲一区爱区精品无码,久久九九精品国产AV片国产


Achievements


The achievement of "Development and Application of Key Technologies for the Production of Phenylphosphine Derivatives" is awarded the second prize of Henan Science and Technology Invention Award in 2019. A new process for selectively cutting carbon phosphine bonds to produce a series of phenyl phosphine derivatives by the "one-pot method" was developed, and the influence of the catalyst choice on yield during the reaction of the series of phenyl phosphine derivatives had been thoroughly studied. The key technical problems of poor stability of organic phosphine compounds and difficulty in industrialization had been solved, with significant economic and social benefits.