共查询到1条相似文献，搜索用时 31 毫秒
1.
《中国科学院院刊(英文版)》2003,17(4):211-211
An environment-friendly ap-proach to producing sym-metric urea derivatives hasbeen developed by Deng Youquanand his colleagues at the Centre forGreen Chemistry and Catalysis un-der the CAS Lanzhou Institute ofChemical Physics.Urea derivatives, together withisocyanates and carbonates, are N-containing compounds. As importantchemicals, their production in theworld is enormous. For example, theoutput of isocyanates in 2001 ex-ceeded five megatons.Unfortunately, they are mainlymanufactured b… 相似文献