Electron spin resonance spin trapping of thiyl, radicals from the decomposition of thionitrites
作者:P.David Josephy、Detlef Rehorek、Edward G. Janzen
DOI:10.1016/s0040-4039(01)81144-8
日期:1984.1
Alkyl thiyl radicals produced by the homolytic decomposition of thionitrites are detected by ESR spintrapping using 5,5-dimethyl-1-Δ-pyrroline-N-oxide (DMPO).
R3M. radicals (M=C, Si, Ge, Sn, P, O, S) to give the corresponding paramagnetic adducts. In the case of 9-methylenanthroneradical addition occurred selectively at the exocyclic carbon-carbon double bond even with Group IV B organometallic radicals for which attack at the carbonyl oxygen would give rise to thermodynamically more stable adducts. When irradiating solutions of 9-methylenanthrone a photoinduced
使标题化合物与一系列R 3 M.基团(M = C,Si,Ge,Sn,P,O,S)反应,得到相应的顺磁性加合物。在9-亚甲基蒽酮基团的情况下,即使在IV B族有机金属基团上,环碳-碳双键选择性地发生加成,其对羰基氧的攻击将产生热力学上更稳定的加合物。辐射9-甲基蒽酮溶液时,发生了光致自反应,导致形成了二聚体。根据测得的ESR光谱参数,讨论了加合物的结构,以及R n M基团对β-质子超细分裂常数的影响。
Hypovalent radicals. 13. Gas-phase nucleophilic reactivities of phenylnitrene (PhN<sup>-</sup> •) and sulfur anion radicals (S<sup>-</sup>•) at sp<sup>3</sup> and carbonyl carbon
作者:Richard N. McDonald、A. Kasem Chowdhury
DOI:10.1021/ja00340a010
日期:1983.1
Reactions of triplet carbenes with sulfides and disulfides: ylide vs. radical formation
作者:A. Alberti、D. Griller、A. S. Nazran、G. F. Pedulli
DOI:10.1021/ja00271a035
日期:1986.5
Photofragment vector correlations measured by transient absorption spectroscopy: cyanogen fragments from ethyl thiocyanate photodissociation
作者:Gregory E. Hall、Ming Wu
DOI:10.1021/j100144a003
日期:1993.10
The correlated angular distribution of translational and rotational motion of photofragments is probed by Doppler-broadened transient absorption line shapes. The one-photon nature of the probe process reduces the complexity of the analysis, while maintaining sensitivity to five bipolar moments of the translational and rotational angular distributions. The 193-nm photodissociation of C2H5SCN illustrates the method, with CN products detected with a titanium:sapphire ring laser probing the A2PI-X2SIGMA+ transition. The vector correlations in the high rotational states of CN indicate a direct dissociation following a transition of mixed symmetry at 193 nm: the recoil is preferentially but not exclusively parallel to a transition moment, and the perpendicular component is dominated by a rotation axis parallel to a C2H5SCN transition moment. The strong rotational excitation is generated by planar bending forces in a bent excited state. Lower rotational states are formed with a composite kinetic energy distribution, indicating an additional, slower, less highly polarized channel that partitions more energy into the unobserved C2H5S radical than does the direct channel. At 248 nm, a weaker absorption also generates CN photofragments with a preferentially parallel recoil, requiring a reassessment of the excited-state assignments in the alkyl thiocyanates.