英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:


请选择你想看的字典辞典:
单词字典翻译
Snar查看 Snar 在百度字典中的解释百度英翻中〔查看〕
Snar查看 Snar 在Google字典中的解释Google英翻中〔查看〕
Snar查看 Snar 在Yahoo字典中的解释Yahoo英翻中〔查看〕





安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:


  • Nucleophilic aromatic substitution - Wikipedia
    A nucleophilic aromatic substitution (SNAr) is a substitution reaction in organic chemistry in which the nucleophile displaces a good leaving group, such as a halide, on an aromatic ring
  • Nucleophilic Aromatic Substitution: Introduction and Mechanism
    The addition intermediates from SNAr reactions can frequently be detected or isolated, and are called Meisenheimer complexes, after Jakob Meisenheimer, who first demonstrated their formation
  • Snár - online výklad snov | Sibyla. sk
    Snár - výklad slov Interpretácia resp výklad snov má za sebou dlhú históriu, a nie je len výmyslom modernej doby Z času na čas sa zrejme každému prisní sen, ktorý ho zaujme natoľko, že by rád poznal jeho hlbší význam Ak vás budia veľmi živé sny, alebo vás v tom lepšom prípade len niektorý váš sen pobavil, jeho význam môžete odhaliť s pomocou nášho online
  • Nucleophilic Aromatic Substitution - Chemistry Steps
    However, some aryl halides with a strong electron-withdrawing substituent (s) on the ring can undergo nucleophilic substitution (SNAr) instead of electrophilic substitution:
  • Engineered enzymes for enantioselective nucleophilic aromatic . . .
    A biocatalytic approach to enantioselective nucleophilic aromatic substitution (SNAr) was achieved through laboratory evolution of highly efficient and selective SNArase biocatalysts
  • Nucleophilic Aromatic Substitution (SNAr) - ChemistryScore
    Nucleophilic Aromatic Substitution (SNAr) Nucleophilic Aromatic Substitution (S N Ar) Definition: Nucleophilic aromatic substitution is a reaction in which the aromatic ring is attacked by the nucleophile For example, when an aromatic compound is treated with a strong nucleophile (hydroxide), a leaving group (bromide) is displaced
  • 16. 7: Nucleophilic Aromatic Substitution - Chemistry LibreTexts
    Objectives After completing this section, you should be able to identify the conditions necessary for an aryl halide to undergo nucleophilic aromatic substitution, and give an example of such a reaction write the detailed mechanism for a nucleophilic aromatic substitution reaction compare the mechanism of a nucleophilic aromatic substitution reaction and the S N 1 and S N 2 mechanisms
  • 5. 6 Nucleophilic Aromatic Substitution: SNAr – Organic Chemistry II
    Such a mechanism is for nucleophilic aromatic substitution, a two-step process, with the symbol SNAr In the first step, the nucleophile attacks the carbon attached to the leaving group (halide) and produces the carbanion intermediate
  • Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)
    Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group This results in





中文字典-英文字典  2005-2009