An Acidity Scale of Triazolium-Based NHC Precursors in DMSO
作者:Zhen Li、Xin Li、Jin-Pei Cheng
DOI:10.1021/acs.joc.7b01755
日期:2017.9.15
An acidity scale of triazolium-based N-heterocyclic carbene precursors was established by measuring 25 compounds’ (10a–15b) equilibrium acidities in dimethyl sulfoxide (DMSO) solution using overlapping indicator method. The pKa values ranged from 12.08 to 15.5, responding not only to the N-aryl motif, but also to the core structure. Excellent correlation was observed between the pKa values and the
通过使用重叠指示剂法测量25种化合物在二甲亚砜(DMSO)溶液中的25(10a - 15b)平衡酸度来建立三唑鎓N-杂环卡宾前体的酸度标度。p K a值的范围为12.08至15.5,不仅响应于N-芳基基序,而且响应于核心结构。在p K a值和哈米特取代基常数(σp)之间观察到极好的相关性。
Substituent Effects and Mechanistic Insights on the Catalytic Activities of (Tetraarylcyclopentadienone)iron Carbonyl Compounds in Transfer Hydrogenations and Dehydrogenations
作者:Bryn K. Werley、Xintong Hou、Evan P. Bertonazzi、Anthony Chianese、Timothy W. Funk
DOI:10.1021/acs.organomet.3c00284
日期:2023.11.13
both the transferhydrogenation and dehydrogenation rates increased. A catalytically relevant, trimethylamine-ligated iron compound was isolated and characterized and was observed in solution under both transferhydrogenation and dehydrogenationconditions. Importantly, it was catalytically active in both reactions. Kinetic isotope effect data and initial rates in transferhydrogenation reactions