A Hexacoordinated P-Bridged Calixarene Derivative -- Phosphorylation of p-tert -Butylthiacalix[4]arene

p-tert -Butylthiacalix[4]arene ( 1 ) reacts with phosphorus pentachloride under participation of the sulfur atoms to a hexacoordinated phosphorus derivative ( 2 ) of the thiacalixarene. Hydrolysis of 2 leads to the twofold 1,2-bridged thiacalixarene bis(chlorophosphate) 3 .