A Nitridoniobium(V) Reagent That Effects Acid Chloride to Organic Nitrile Conversion: Synthesis via Heterodinuclear (Nb/Mo) Dinitrogen Cleavage, Mechanistic Insights, and Recycling
作者:Joshua S. Figueroa、Nicholas A. Piro、Christopher R. Clough、Christopher C. Cummins
DOI:10.1021/ja056408j
日期:2006.1.1
Na[1a-N] with acid chloride substrates in tetrahydrofuran (THF) furnishes the corresponding organic nitriles concomitant with the formation of NaCl and the oxo niobium complex O[triple bond]Nb(N[Np]Ar)3 (1a-O). Utilization of 15N-labeled 15N2 gas in this chemistry affords a series of 15N-labeled organic nitriles establishing the utility of anion [1a-N]- as a reagent for the 15N-labeling of organic molecules
通过末端氮化铌阴离子 [N[三键]Nb(N[Np]Ar)3]- ([1a- N]-,其中 Np = 新戊基和 Ar = 3,5-Me2C6H3) 通过等价 N 进行 O(Cl) 复分解交换。使用三酰胺钼系统 Mo(N[R]Ar)3 (R = t-Bu, 2a; R = Np, 2b) 作为反应,在异双核 N2 裂解反应中获得氮基阴离子 [1a-N]-伙伴。异双核桥接 N2 配合物 (Ar[R]N)3Mo-(mu-N2)Nb(N[Np]Ar)3 (R = t-Bu, 3b; R = Np, 3c) 与钠汞齐的还原断裂提供 1 当量的盐 Na[1a-N] 和中性 N[三键]Mo(N[R]Ar)3 (R = t-Bu, 2a-N; R = Np, 2b-N)。很容易实现 2-N 与 Na[1a-N] 的分离。在四氢呋喃 (THF) 中用酰氯底物处理盐 Na[1a-N] 会提供相应的有机腈,同时形成