亚甲基二甲基锍离子 在
2-碘代丙烷 作用下,
以
gas 为溶剂,
生成 Iodomethyl-dimethyl-sulfonium
参考文献:
名称:
Radical-type reactivity of the methylenedimethylsulfonium ion, (CH3)2S+CH2˙
摘要:
AbstractAb initio molecular orbital calculations at the MP2/6–31G*//6–31G* + ZPVE level of theory suggest that the ion (CH3)2S+CH2˙ is 75 kJ mol−1 higher in energy than ionized ethyl methyl sulfide. However, this distonic ion is stable toward isomerization to the conventional structure: the two ions show distinctly different reactivity in a dual‐cell Fourier transform ion cyclotron resonance mass spectrometer. Molecular orbital calculations further indicate that the charge site of the ion is on the sulfur atom whereas the odd‐spin density is localized on the CH2 group. The chemical properties of the ion reflect this description. The coordinatively saturated sulfonium charge site is chemically inert. This radical cation possesses unique chemical reactivity in that its reactions are associated with the radical site. Most of these reactions involve a homolytic bond cleavage in the neutral molecule, resulting in abstraction of an atom or a radical by the ion. The reaction efficiency correlates with the homolytic bond dissociation energy of the bond being broken in the neutral molecule, suggesting a simple radical abstraction mechanism for these reactions. Hence, the methylenedimethylsulfonium ion is best described as on electrophilic radical with an inert charge site.
Stirk, Krista M.; Orlowski, Joseph C.; Leeck, Diane T., Journal of the American Chemical Society, 1992, vol. 114, # 22, p. 8604 - 8607
作者:Stirk, Krista M.、Orlowski, Joseph C.、Leeck, Diane T.、Kenttämaa
DOI:——
日期:——
Chyall, Leonard J.; Byrd, Michelle H. C.; Kenttämaa, Hilkka I., Journal of the American Chemical Society, 1994, vol. 116, # 23, p. 10767 - 10772
作者:Chyall, Leonard J.、Byrd, Michelle H. C.、Kenttämaa, Hilkka I.
DOI:——
日期:——
Gas-phase reactions of the sulphur distonic ion with alkenes
作者:Margot W. van Amsterdam、Paul O. Staneke、Steen Ingemann、Nico M. M. Nibbering
DOI:10.1002/oms.1210280816
日期:1993.8
Long-lived distonic radical cations
作者:Hilkka I. Kenttämaa
DOI:10.1002/oms.1210290102
日期:1994.1
Organic radical cations abstract methylene from ketene to produce stable distonic ions
作者:Rebecca L. Smith、Rebecca L. Franklin、Krista M. Stirk、Hilkka I. Kenttamaa
DOI:10.1021/ja00075a059
日期:1993.11
Gas-phase reactions of neutral ketene can be used to generate a variety of stable distonic radicalcations, i.e., ions with a carbon radical center separated from the charge site by differing numbers of methylene units. Conventional radicalcations abstract one to three CH 2 groups (accompanied by loss of CO) from neutral ketene in consocutive reactions, the number of CH 2 abstractions depending upon