anhydrous iron chloride; acetyl chloride in 1,2-dichloro-ethane 0.75 h;

SbF5 intercalated in graphite in pentane T=25°C; 20 h; Yield given;

4,7,13,18-tetraoxa-1,10-diazabicyclo[8.5.5]eicosane in diethyl ether Ambient temperaturevariation of reagent, solvent, and temperature; the stereochemistry of the reaction was investigated;; Product distribution;