toluene-4-sulfonic acid in toluene Heating;

1: hexan-1-ol With sodium hydride in N,N-dimethyl-formamide 1 h; Inert atmosphere; 2: 3,3-bis(bromomethyl)-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine in N,N-dimethyl-formamide T=90°C; 24 h; Inert atmosphere;