bis(1,5-cyclooctadiene)-rhodium(I) tetrafluoroborate in various solvent(s) T=130°C; 15 h;

in toluene RefluxInert atmosphere;

n-butyllithium; magnesium sulfate in tetrahydrofuran n-BuLi added to soln. of BrC6H4SiMe3 in THF at -78°C; after 15 min B(OiPr)3 added dropwise; warmed to room temp. overnight; H2O, Et2O, concd. HCl added; org. phase washed (H2O, brine); solvent removed (vac.); residue dissolved in THF;; neopentyl glycol and MgSO4 added; stirred for 1 h; solvent removed (vac.); hexane added to the oily residue; filtered; crystn. from filtrate at -25°C; elem. anal.;

1.1: n-BuLi / tetrahydrofuran / 0.25 h / -78 °C 1.2: tetrahydrofuran / -78 - 20 °C 2.1: aq. HCl / diethyl ether 3.1: 106 g / MgSO4 / tetrahydrofuran / 1 h View Scheme