The compounds (Me3Si)xCH(3−x)Cl (x = 1–3), (Me3Si)xCH(3−x)Br (x = 1, 3) and Me3SiCMe2Br have been found to react with 90% acetone or 80% ethanol at 70° at rates too small for convenient measurement. Towards aqueous acetone, the compound PhMe(Me3Si)CBr is 110 times less reactive at 50° than PhMe2CBr at 0°. It is concluded that relative to α-Me, α-t-Bu or α-Me3Si groups decrease the ease of formation
Langlebige α-metallierte methylradikale und deren dimere
作者:Horst Hillgärtner、Wilhelm P. Neumann、Winfried Schulten、Antonios K. Zarkadis
DOI:10.1016/s0022-328x(00)92576-2
日期:1980.11
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 CH or CHal 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