Synthesis ofN-Phenyl-N′-pyrimidylurea Derivatives by Selenium- or Selenium Dioxide-Catalyzed Reductive Carbonylation of Nitroaromatics
作者:Jinzhu Chen、Gang Ling、Shiwei Lu
DOI:10.1002/ejoc.200300127
日期:2003.9
N-phenyl-N′-pyrimidylureaderivatives were synthesized in moderate-to-good yields by one-pot reductivecarbonylation of nitroaromatics using selenium or selenium dioxide as the catalyst, aminopyrimidine derivatives as co-reagents, and carbon monoxide as the carbonyl source. The reaction parameters were investigated, as was the reusability of the catalysts. We found that selenium- or selenium dioxide-catalyzed
Molecular conformation of 1,3-pyridylphenylureas by 1H and 13C NMR study
作者:L.V. Sudha、D.N. Sathyanarayana
DOI:10.1016/0022-2860(85)85108-5
日期:1985.10
1H and 13CNMR spectra are reported for several 1,3-pyridylphenyl ureas. Analysis of the spectra yielded the chemical shifts. The variations in the chemical shifts have been discussed in terms of the molecular conformations.
报告了几种 1,3-吡啶基苯基脲的 1 H 和 13 C NMR 光谱。光谱分析产生化学位移。已经根据分子构象讨论了化学位移的变化。
Preparation for promoting hair growth
申请人:Sansho Seiyaku Co., Ltd.
公开号:EP0540854B1
公开(公告)日:1998-01-21
US5656264A
申请人:——
公开号:US5656264A
公开(公告)日:1997-08-12
Synthesis of New Unsymmetrical 4,5-Dihydroxy-2-imidazolidinones. Dynamic NMR Spectroscopic Study of the Prototropic Tautomerism in 1-(2-Benzimidazolyl)-3-phenyl-4,5-dihydroxy-2-imidazolidinone
作者:Mehdi Ghandi、Abolfazl Olyaei、Farshid Salimi
DOI:10.3390/11100768
日期:——
inones 5a-f. All the products were characterized by elemental and spectroscopic analyses. The free-energy barrier (Delta G not equal) for prototropictautomerism in 1-(2-benzimidazolyl)-3-phenyl-4,5-dihydroxy-2-imidazolidinone (5f) was determined by dynamic NMR studies to be 81 +/- 2 KJ mol(-1).