1: With C46H178O41Si42; titanium (IV) isopropoxide in toluene T=100°C; 24 h; Inert atmosphere; 2: With hydrogenchloride; water in toluene T=20°C; 4 h; Inert atmosphere;

1: N,N-di(2-propynyl)amine With pyridine in dichloromethane T=20°C; 12 h; 2: acetylene With [rhodium(I)chloride(triphenylphosphine)3] in ethanol; dichloromethane T=60°C; 48 h; 3: With hydrogenchloride in methanol; dichloromethane T=20°C; 1 h; Further stages.;

sodium hydroxide in ethylene glycol dimethyl ether; water T=20°C; Inert atmosphere;

1: thionyl chloride / ethylene glycol dimethyl ether / 20 °C / |Inert atmosphere 2: sodium hydroxide / ethylene glycol dimethyl ether; water / 20 °C / |Inert atmosphere View Scheme

in methanol-d4; Petroleum ether study of the effect of the concentration on the cyclization reaction; Rate constantProduct distribution;

sodium hydroxide

ethanol; platinum T=50°C; Hydrogenation;