SEARCH Articles Figures Tables Addition, electrophilic cyclic intermediates Cyclic cationic intermediate Cyclic iodonium ion intermediate Cyclic ion intermediate Cyclic orthoester intermediate Cyclic oxonium intermediate Cyclic phosphorane intermediate Fragmentation of Cyclic Oxonium Intermediates Orthoesters, cyclic intermediate Productive intermediates cyclic phosphate intermediate Reaction intermediates, cyclic Ribonuclease cyclic phosphate intermediate Transition cyclic intermediates