bis(8,8a-dihydro-3aH-indeno[1,2-d]oxazole-2-yl)cyclopropane; anhydrous magnesium perchlorate; triethylamine; 4 A molecular sieve in dichloromethane T=20°C; 8 h; Title compound not separated from byproducts;

thionyl chloride in dichloromethane Chlorination; 2 h; Heating;

thionyl chloride in dichloromethane Chlorination; 2 h; Heating;