24300-00-3Relevant articles and documents
Magic acid free generation of antiaromatic dications at room temperature
McClintock, Sean P.,Mills, Nancy S.
, p. 10254 - 10257 (2011)
A new method for the generation of dicationic species via ionization of diols is described. The method makes use of milder reagents at room temperatures, an advantage over use of Magic Acid at -78 °C. A series of mono- and dications were synthesized successfully, including previously unattainable species.
Photochemistry of 3H-indazoles in protic media. Benzyl cations via protonation of 2-methylene-3,5-cyclohexadienylidenes
Fehr,Fehr, Olaf C.,Grapenthin,Grapenthin, Olaf,Kilian,Kilian, Joerg,Kirmse,Kirmse, Wolfgang,Steenken,Steenken, Steen
, p. 5887 - 5890 (2007/10/02)
Photolysis of 3,3-disubstituted 3H-indazoles in protic media (ROH) gives rise to benzyl ethers, in addition to hydrocarbons (derivatives of benzocyclopropene, styrene, and fluorene) which are also found in aprotic solvents. In the presence of ROD, the benzyl ethers are formed with incorporation of deuterium into the ortho position, pointing to protonation of 2-methylene-3,5-cyclohexadienylidenes. Laser flash photolysis of 3H-indazoles generates diazo compounds and benzyl cations as transient intermediates.
ON THE 1H-NMR SPECTRA OF HIGHLY CHARGED MULTI-TRIPHENYLMETHYLIUM IONS
Wilcox, C.F.,Hellwinkel, D.,Stahl, H.,Gaa, H.G.,Doerner, M.
, p. 5501 - 5504 (2007/10/02)
Relative to their neutral precursors, highly charged multi-tritylium ions show typical downfield 1H-NMR shifts, whereas the corresponding phenylfluorenylium ions show upfield shifts.A Hueckel based model is presented that accounts for this contrasting behavior in terms of antiaromatic ring current in the five-membered ring of the fluorenyl system with essentially null ring currents in the two six-membered rings.
