Cyclic Organophosphorus Compounds; XIX1. A Convenient Synthesis of 7-Aza-2,6-dioxa-1-phosphabicyclo[2.2.2]octanes by the Cyclization of trans-2-Amino-5-chloromethyl-2-oxo-1,3,2-dioxaphosphorinanes - Edmundson, Ronald S (Synthesis, 1983)