1.1: N-iodo-succinimide / acetonitrile / 0.33 h / 25 °C / |Inert atmosphere 2.1: n-butyllithium; N,N'-dimethyl-N,N'-propyleneurea / hexane; tetrahydrofuran / 0.5 h / 25 °C / |Inert atmosphere 2.2: 6 h / -78 - 25 °C / |Inert atmosphere 3.1: 2,6-di-tert-butyl-4-methyl-phenol; Grubb's 2nd generation catalyst / dichloromethane; toluene / 6.5 h / 25 °C / |Inert atmosphere 4.1: 2,6-di-tert-butyl-4-methyl-phenol; tetrakis(triphenylphosphine) palladium(0); thallium(I) hydroxide / water; tetrahydrofuran; toluene / 5 h / 25 °C / |Inert atmosphere View Scheme

1.1: N-iodo-succinimide / acetonitrile / 0.33 h / 25 °C / |Inert atmosphere 2.1: n-butyllithium; N,N'-dimethyl-N,N'-propyleneurea / hexane; tetrahydrofuran / 0.5 h / 25 °C / |Inert atmosphere 2.2: 6 h / -78 - 25 °C / |Inert atmosphere 3.1: 2,6-di-tert-butyl-4-methyl-phenol; Grubb's 2nd generation catalyst / dichloromethane; toluene / 6.5 h / 25 °C / |Inert atmosphere 4.1: 2,6-di-tert-butyl-4-methyl-phenol; tetrakis(triphenylphosphine) palladium(0) / tetrahydrofuran; toluene / 0.08 h / 25 °C / |Inert atmosphere 4.2: 4 h / 25 °C / |Inert atmosphere View Scheme