1: 3,4-dihydro-1H-2-benzopyran With 2,3-dicyano-5,6-dichloro-p-benzoquinone in chlorobenzene T=80°C; 1.5 h; Inert atmosphere; 2: phenyl-magnesium bromide in diethyl ether; chlorobenzene T=0°C; 3 h; Inert atmosphere;

1: 3,4-dihydro-1H-2-benzopyran With 2,3-dicyano-5,6-dichloro-p-benzoquinone; bis-[(trifluoroacetoxy)iodo]benzene in 1,2-dichloro-ethane T=80°C; 3 h; Inert atmosphere; 2: PhMgI in diethyl ether; 1,2-dichloro-ethane T=-20°C; 3 h; Inert atmosphere; SolventReagent/catalystTemperature;

Ersorb-4a in toluene T=110°C; oxa-Pictet-Spengler reaction; 40 h;

triethylsilane; trimethylsilyl trifluoromethanesulfonate in dichloromethane 0.75 h; Ambient temperature;

1: Einleiten von HCl 2: bromine; benzene / Behandeln im UV-Licht View Scheme

chlorine Behandeln im UV-Licht;

hydrogenchloride