动力学数据报道了1-甲基-3-硝基吡啶鎓阳离子与其假碱(氢氧化物加合物)的平衡,以及该阳离子被1-苄基-1,4-二氢烟碱酰胺还原的动力学数据。当该吡啶鎓阳离子与碱水溶液混合时,C-2氢氧化物加合物是动力学控制的产物(pK R + = 11.6),但是,这种物质重新排列成C-4加合物,成为热力学上更稳定的产物(pK R + = 9.42)。 。可以分析此平衡的pH依赖性,得出k OH = 1600 M -1 s -1氢氧根离子攻击该阳离子的C-4。用1-苄基-1,4-二氢烟碱酰胺还原吡啶鎓阳离子似乎仅在C-4处发生,二级速率常数k 2 = 0.72 M -1 s -1和k 2 H / k 2 D = 2.0 in 20%CH 3 CN-80%H 2 O,离子强度1.0,25°C。
Structure and C−S Bond Cleavage in Aryl 1-Methyl-1-arylethyl Sulfide Radical Cations
作者:Enrico Baciocchi、Marta Bettoni、Tiziana Del Giacco、Osvaldo Lanzalunga、Marco Mazzonna、Paolo Mencarelli
DOI:10.1021/jo102086f
日期:2011.1.21
formation of products deriving from the C−S bondcleavage in the radical cations 1+•−7+• (2-aryl-2-propanols and diaryl disulfides). Formation of 1+•−7+• was also demonstrated by LFP experiments evidencing the absorption bands of the radical cations 1+•−3+• (λmax = 530 nm) and 5+•−7+• (λmax = 570 nm) mainly localized in the arylsulfenyl group and radical cation 4+• (λmax = 410, 700 nm) probably mainly localized
一系列对-X-枯基苯硫醚(4-XC 6 H 4 C(CH 3)2 SC 6 H 5:1,X = Br; 2,X = H; 3,X = CH 3;4,X = OCH 3)和对-X-枯基对甲氧基苯基硫化物(4-XC 6 H 4 C(CH 3)2 SC 6 H 4 OCH 3:5,X = H; N = 1。6,X = CH 3 ; 7,X = OCH 3)已在的存在下进行Ñ甲氧菲啶鎓六氟磷酸盐(MEOP + PF 6 - )在氮气下在MeCN。稳态光解显示的产品在自由基阳离子从C-S键断裂导出的形成1 +• - 7 +•(2-芳基-2-丙醇和二芳基二硫化物)。的形成1 +• - 7 +•还通过实验LFP证明自由基阳离子的吸收谱带表明1 +• - 3 +•(λ最大= 530纳米)和5 +• - 7 +•(λ最大= 570纳米)主要定位的芳基亚磺酰基团和自由基阳离子在4 +•(λ最大= 410,70
Relative reactivities of heteroaromatic cations towards reduction by 1,4-dihydronicotinamides
作者:John W. Bunting、Judy L. Bolton
DOI:10.1016/s0040-4020(01)87506-2
日期:1986.1
reported for the equilibration of the 1-methyl-3-nitropyridinium cation with its pseudobase (hydroxide adduct) and for the reduction of this cation by 1-benzyl-1, 4-dihydronicotinamide. The C-2 hydroxide adduct is the kinetically controlled product (pKR+ = 11.6) when this pyridiniumcation is mixed with aqueous base, however, this species rearranges to the C-4 adduct as the themodynamically more stable product
动力学数据报道了1-甲基-3-硝基吡啶鎓阳离子与其假碱(氢氧化物加合物)的平衡,以及该阳离子被1-苄基-1,4-二氢烟碱酰胺还原的动力学数据。当该吡啶鎓阳离子与碱水溶液混合时,C-2氢氧化物加合物是动力学控制的产物(pK R + = 11.6),但是,这种物质重新排列成C-4加合物,成为热力学上更稳定的产物(pK R + = 9.42)。 。可以分析此平衡的pH依赖性,得出k OH = 1600 M -1 s -1氢氧根离子攻击该阳离子的C-4。用1-苄基-1,4-二氢烟碱酰胺还原吡啶鎓阳离子似乎仅在C-4处发生,二级速率常数k 2 = 0.72 M -1 s -1和k 2 H / k 2 D = 2.0 in 20%CH 3 CN-80%H 2 O,离子强度1.0,25°C。
Studies of gas-phase reactions of cationic iron complexes of 2-pyrimidinyloxy-<i>N</i>
-arylbenzylamines by electrospray ionization tandem mass spectrometry
作者:Chu Xu、Hao-Yang Wang、Feng-Jun Zhu、Yin-Long Guo、Long Lu
DOI:10.1002/rcm.4848
日期:2011.1.15
cationic iron (Fe) complexes of 2-pyrimidinyloxy-N-arylbenzylamines (1-6), which are generated by ESI when mixing their methanolic solutions. Further studies of these Fe complexes by collision-induced dissociation (CID) show that Fe(III) complexes undergo an interesting gas-phase single electron transfer (SET) reaction to give 1(•+) -6(•+) ,with loss of neutral FeCl(2) , whereas Fe(II) can catalyze gas-phase