As part of our studies on metallated diylides 4 and diazaylides 5 exhibiting a high nucleophilicity, we recently became interested in the reactivity of the lithium azayldiide Ph 3 P NLi (2) 6 (isoelectronic with the methylide Ph 3 P CHLi) 7 towards various and commercially available phosphorus electrophiles. Related to that subject, we report herein a new method for the preparation of various non-ionic and very strong phosphazene type bases (P 2–3–4 , ...
