K. Nishiyama et al., Radical isomerization of 9,10-dihydro-9,10-disilaanthracene derivatives: stabilization factor of silyl radicals, J ORGMET CH, 626(1-2), 2001, pp. 32-36
In order to examine the nature of the silyl radical in the disilaanthracene
framework, separation and radical isomerization of the cis and trans isome
rs of the disilaanthracene derivatives were investigated. When a pentane so
lution of the disilaanthracene derivative was irradiated with a 400 W mercu
ry lamp in the presence of DTBP for 4 h. both isomers readily isomerized to
give a mixture of cis and trans isomers in a ratio of ca. 50:50. However,
no such isomerization reaction of 9,10-dihydro-9-silaanthracene derivatives
occurred under similar conditions. (C) 2001 Elsevier Science B.V. All righ
ts reserved.