Selective Formation of Triplet Alkyl Nitrenes from Photolysis of β-Azido-Propiophenone and Their Reactivity
作者:Pradeep N. D. Singh、Sarah M. Mandel、Jagadis Sankaranarayanan、Sivaramakrishnan Muthukrishnan、Mingxin Chang、Rachel M. Robinson、Paul M. Lahti、Bruce S. Ault、Anna D. Gudmundsdóttir
DOI:10.1021/ja077523s
日期:2007.12.1
formation of triplet alkylnitrenes 2 that were detected directly with laser flash photolysis (lambdamax = 325 nm, tau = 27 ms) and ESR spectroscopy (|D/hc| = 1.64 cm-1, |E/hc| = 0.004 cm-1). Nitrenes 2 were further characterized with argon matrix isolation, isotope labeling, and molecular modeling. The triplet alkylnitrenes are persistent intermediates that do not abstract H-atoms from the solvent but
Rate constants for the reactions CN(ν=0), CN(ν=1)+H2, D2→HCN, DCN+H, D between 295 and 768 K, and comparisons with transition state theory calculations
作者:Ian R. Sims、Ian W.M. Smith
DOI:10.1016/0009-2614(88)80384-1
日期:1988.9
Time-resolved, laser-inducedfluorescence (LIF) measurements have been carried out on the kinetics of CN (ν=0) and CN (ν=1) with H2 and D2 between 295 and 768 K. The rate constants for reaction of CN (ν=0) with H2 and D2 are fitted well by the modified Arrhenius expressions: (2.4±0.7)×10−12(T/298)1.6±0.2exp[−(1340±90)/T] and (7.9±1.5)×10−13 × (T/298)2.2±0.1 exp[− (1330±60)/T] cm3 molecule−1 s−1 (errors
对CN(ν= 0)和CN(ν= 1)的H 2和D 2在295 K至768 K之间的动力学进行了时间分辨的激光诱导荧光(LIF)测量。反应的速率常数H(2)和D 2(2)的CN(ν= 0)的分布通过修正的Arrhenius表达式很好地拟合:(2.4±0.7)×10 -12(T / 298)1.6±0.2 exp [-(1340±90)/ T ]和(7.9±1.5)×10 -13 ×(T / 298)2.2±0.1 exp [-(1330±60)/ T ] cm 3分子-1 s -1(引用的误差是一个标准偏差)。具有H 2和D 2的CN(ν= 1)的速率常数在实验误差范围内是相同的,只是在低温下D 2的CN(ν= 1)的去除速率略小于CN(ν= 1)的速率常数。 CN(ν= 0)。将实验结果与基于过渡状态的从头算信息的常规过渡状态理论计算的结果进行比较。通过调整势垒高度以重现295 K时CN +
The rotational spectrum of the weakly bound molecular complex OC ··· HCN investigated by pulsed-nozzle, Fourier-transform microwave spectroscopy
作者:Elizabeth J. Goodwin、A.C. Legon
DOI:10.1016/0301-0104(84)85141-1
日期:1984.6
the ground-state rotationalspectrum of each of eleven isotopic species of a weakly bound molecular complex formed by carbon monoxide and hydrogen cyanide. The nature of the spectra is consistent with a linear complex. Accurate values of the rotational constants B0, the centrifugal distortion constants DJ and, where appropriate, the nuclearquadrupolecoupling constant χaa(14N) or χaa(D) have been determined
The stereochemistry of metal catalysed hydrogen cyanide addition to alkenes
作者:W.Roy Jackson、Craig G. Lovel
DOI:10.1016/s0040-4039(00)87174-9
日期:1982.1
Reactions of both terminal and cyclic alkenes have been shown to occur in a stereospecifically - manner with deutrerium cyanide when a catalyst system based on Pd(DIOP)2 was used. Reactions of cyclohexene give only the products of equatorial cyanide incorporation.