Phosphazene, reaction with dimethyl

An ab initio study of structure and bonding in diphosphinylcarbenes indicates that the non-symmetric ylide-type structure (29) is preferred." The configuration and conformation of a number of polyfunctional 1-aminobuta-1,3-dienes (30), prepared by the reaction of dimethyl acetylenedicarboxylate with (Z)-P-enamino-l -phosphazenes, have been studied by n.m.r.. X-ray, and theoretical methods. The P n.m.r. spectra of a number of protonated iminophosphorane-substituted proton sponges, e g. (31), of known crystal structure have been studied in the solid state."... 

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