76241-30-0Relevant articles and documents
Free electron transfer mirrors rotational conformers of substituted aromatics: Reaction of benzyltrimethylsilanes with n-butyl chloride parent radical cations
Brede, Ortwin,Hermann, Ralf,Naumov, Sergej,Zarkadis, Antonios K.,Perdikomatis, Gerasimos P.,Siskos, Michael G.
, p. 2267 - 2275 (2007/10/03)
The rotation motion of a larger substituent of an aromatic ring is accompanied by the electron density fluctuation of the highest occupied molecular orbitals. For benzyltrimethylsilanes p-R3-C 6H4-○-CR1-R2
Sterically Hindered Free Radicals. 18. Stabilization of Free Radicals by Substituents As Studied by Using Triphenylmethyls
Neumann, Wilhelm P.,Penenory, Alicia,Stewen, Ulrich,Lehnig, Manfred
, p. 5845 - 5851 (2007/10/02)
The relative stabilization of 10 4-mono- and 24 4,4'-disubstituted triphenylmethyl radicals 1 has been measured by recording the degree of dissociation of the corresponding quinonoid dimers 2 by means of ESR.The following substituents or combinations of t
LANGLEBIGE α-METALLIERTE METHYLRADIKALE UND DEREN DIMERE
Hillgaertner, Horst,Neumann, Wilhelm P.,Schulten, Winfried,Zarkadis, Antonios K.
, p. 197 - 211 (2007/10/02)
Persistent radicals R'2C-MR3 (I), R'C(MR3)2 (II) and RC(MR3)OMR3 (III), R'=mostly Ph but also t-Bu, H, R'2=also 9-fluorenyl or 9-xanthenyl, M=Si, Ge, Sn, have been generated from the corresponding C-H or C-Hal compounds or by addition of R3M to ketones.Radicals I, II and III are investigated by ESR spectroscopy.A temperature-dependent equilibrium has been found between these radicals and their dimers (IV), of, as far as investigated, quinonoid structure.Dimers IV rearrange with acids giving diaryl methanes.Autoxidation of radicals I at 80 deg C gives thebenzpinacol derivatives, whose radicals are oxidized again, undergoing different fragmentations.At room temperature, however, the dimers IV are attacked by O2 forming the metalated benzophenone derivatives via fragmentation, which are split by UV light into the radicals R3M (M=Si, Ge, Sn) and the oxyl radicals, which are highly stabilised by mesomerism.
