The spiropentyl radical and some homolytic reactions of spiropentane
Abstract
Spiropentyl radical was generated by hydrogen abstraction from spiropentane by t-butoxyl radical and its e.s.r. spectrum obtained. The experimental e.s.r. parameters were compared with computational results obtained using semi-empirical SCF MO methods. The spiropentyl radicals do not undergo β-scission in the observable temperature range (T < 380 K). The main process in the halogenation of spiropentane at 293 K in CCl4 solution involves SH2 attack by the halogen atom to give 1-(halogenomethyl)cyclopropylmethyl radicals. The β-scission of these latter radicals has been investigated by e.s.r. spectroscopy and by the reduction of 1,1-bisbromomethylcyclopropane with tri-n-butyltin hydride.