erically pure cis-and irons-1 -methyl-4-íerí-butyl-1 -silacyclohexane (see Scheme I). Their experiments were carried out at 0 °C, and their product yields in CC14 and in CHC13 can be used to calculate the inversion rate constants kx and k-x at this temperature with the assumption that the cis-and trans-silyl radicals react with the chlorinating agent at the same rate. That is, kcis = /ctrans = 3.78 X 109 M"1 and 2.07 X 10s M"1 s"1 for CC14 (see Table I) and CHC13 (see Table II), respectively, at 0 °C. The data tabulated by Sakurai and Murakami53 yield kx = 6.4 X 109 s"1 (CC14) and 11.5 X 109 s"1 (CHC13) and k.x = 2.9 X 109 s"1 (CC14) and 4.3 X 109 s"1 (CHCI3). The two chlorinating solvents yield individual inversion rate constants kx and k_x which are in good agreement. More importantly, these rate constants are in the same range as that calculated for the inversion of Sommer and Ulland's48 (55) Espenson,
{ (115-C5MeS)Re(C0)2}*(~-~2,~2'-c6H6)l u .v. i r ra d iat i o n of [( y5-C5M e5) Re ( CO 13] i n be nzen e y i e I ds the st a bl e co m pl ex [ { ( q5-C5M e5 ) Re( CO j2} 2( p-q2 ,q2 ' -C6H 6)] ;X-ray diffraction reveals a pronounced double-bond localization in the doubly co-ordinated benzene Iigand.
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