methanol in methanol Irradiation (UV/VIS); solid carbene complex in dry methanol is added to an oven-dried Pyrex pressure tube, contents are degassed, purged with Ar, warmed to room temp., purged with CO, pressurized with 50-90 psi CO, irradiated (450 W) for 24 h; elem. anal., single diastereomer;

methanol; n-butyllithium; carbon monoxide in tetrahydrofuran; methanol; hexane Irradiation (UV/VIS); soln. of carbene in THF is cooled to -78°C, deoxygenated, kept under Ar; BuLi in hexane is added at -78°C, acid ester is added, stirring for 2 h; resulting intermediate is taken in MeOH, irradn. under 75 psi of CO for 15-24 h;; removing Cr(CO)6 by filtn.; filtrate is concd. in vacuo, dissolved in ether-hexane, photooxidized, filtn., evapn., radial chromy. yields amino ester, NMR, IR, elem. anal.;

in tert-butyl alcohol Irradiation (UV/VIS); solid carbene complex in t-BuOH is added to an oven-dried Pyrex pressure tube, contents are degassed, purged with Ar, warmed to room temp., purged with CO, irradiated (450 W); elem. anal., >93 percent de;

n-butyllithium; carbon monoxide in tetrahydrofuran; hexane; tert-butyl alcohol Irradiation (UV/VIS); soln. of carbene in THF is cooled to -78°C, deoxygenated, kept under Ar; BuLi in hexane is added at -78°C, benzylbromide is added, stirring for 2 h; resulting intermediate is taken in t-BuOH, irradn. under 75 psi of CO for 15-24 h;; removing Cr(CO)6 by filtn.; filtrate is concd. in vacuo, dissolved in ether-hexane, photooxidized, filtn., evapn., radial chromy. yields amino ester, NMR, IR, elem. anal.;