1: 86 percent / CAN / 5 h / 20 °C 2: 80 percent / NaOMe / methanol / 1 h View Scheme

2,2-bis(tert-butylperoxy)butane; (tBuOH)3SiSH in octane 3 h; Heating;

1: epoxy-cyclododecane With sodium hydride in N,N-dimethyl-formamide; benzene T=20°C; 2 h; 2: chloromethyl methyl ether in N,N-dimethyl-formamide; benzene T=20°C; 16 h; Further stages.;

toluene-4-sulfonic acid; lithium bromide 1 h; Ambient temperature;