1: 92 percent / p-TsOH 2: (COCl)2, DMSO / CH2Cl2 / Ambient temperature 3: KN(SiMe3)2 / tetrahydrofuran / 0 °C 4: 1.) PhSSPh; 2.) BF3*Et2O / 1.) irrad.,r.t., hexane; 2.) CH2Cl2, r.t. 5: 1N NaOH / methanol 6: SOCl2 / benzene / Heating 7: 70 percent / LiN(SiMe3)2 / tetrahydrofuran / -100 °C 8: 97 percent / NaBH4 / methanol / 0 °C 9: NCS, AgNO3 10: 10percent MeOH, CF3COOH / 60 °C 11: 68 percent / 2N NaOH / methanol / Ambient temperature 12: H2 / 10percent Pd/C / methanol View Scheme

1: 100 percent / PPh3; CBr4 / CH2Cl2 2: 98 percent / PTS / benzene / Heating 3: 100 percent / Na2CO3 / acetonitrile / Heating View Scheme