1: 1) diphenylphosphorazidate, Et3N, 2) 15percent HCl, AcOH / 1) benzene, a) 1 h, b) r.t., 1 h, c) reflux, 3 h, 2) r.t., overnight 2: 60 percent / SO2Cl2, Et3N / diethyl ether / a) -70 deg C, 2 h, b) -20 deg C, overnight 3: 1) NaH, 2) tert-butyl hypochlorite / 1) hexane, r.t., 3 h, 2) hexane, r.t., overnight View Scheme

1: 1) n-BuLi, N-isopropylcyclohexylamine / 1) THF, -70 deg C, 1 h, 2) THF, HMPA, r.t., overnight 2: 20percent aq. NaOH / methanol / 2 h / Heating View Scheme

Yield given. Multistep reaction;

1: 1) diphenylphosphorazidate, Et3N, 2) 15percent HCl, AcOH / 1) benzene, a) 1 h, b) r.t., 1 h, c) reflux, 3 h, 2) r.t., overnight 2: 60 percent / SO2Cl2, Et3N / diethyl ether / a) -70 deg C, 2 h, b) -20 deg C, overnight 3: 1) NaH, 2) tert-butyl hypochlorite / 1) hexane, r.t., 3 h, 2) hexane, r.t., overnight 4: 43 percent / diethyl ether / 6 h / 23 °C / Irradiation; variation of concentration; addition of Ph2PH; addition of Mg-powder, activated by various methods View Scheme

1: 1) diphenylphosphorazidate, Et3N, 2) 15percent HCl, AcOH / 1) benzene, a) 1 h, b) r.t., 1 h, c) reflux, 3 h, 2) r.t., overnight 2: 60 percent / SO2Cl2, Et3N / diethyl ether / a) -70 deg C, 2 h, b) -20 deg C, overnight 3: 1) NaH, 2) tert-butyl hypochlorite / 1) hexane, r.t., 3 h, 2) hexane, r.t., overnight 4: 26 percent / diethyl ether / 6 h / 23 °C / Irradiation; variation of concentration; addition of Ph2PH; addition of Mg-powder, activated by various methods View Scheme