1: 5,5-bis(phenylsulfonyl)-1-pentene With sodium hydride in N,N-dimethyl-formamide; mineral oil T=0 - 20°C; 0.25 h; Inert atmosphere; 2: propargyl bromide in dimethyl sulfoxide; mineral oil T=75°C; 24 h; Inert atmosphere;

1.1: 17 h / |Inert atmosphere 2.1: sodium hydride / mineral oil; N,N-dimethyl-formamide / 0.25 h / 0 - 20 °C / |Inert atmosphere 2.2: 24 h / 75 °C / |Inert atmosphere View Scheme

tris(dibenzylideneacetone)dipalladium(0) chloroform complex; tris-(o-tolyl)phosphine in benzene Ambient temperatureinfluence of different acid co-catalysts; Product distribution;

chromium dichloride; polymer supported nickel in tetrahydrofuran; ethanol 4.5 h; Ambient temperature;