TAGHVAEI-GANJALI, S.; ALI KHALILZADEH, M.; TAHVILDARI, K.; KHOSRAVI, M.; HOSSEINZADEH, M. Selective Ipso-Nitration of Tert-Butyl Calix[4]arene Ether Derivatives under Mild and Heterogeneous Conditions. ajc 2010, 19, 1494-1498.