31 P{ 1 H} NMR analysis reveals a complex mixture of phosphates (Figure ). Dominant, assignable species are 2 and TriMP. The majority of the other phosphorus environments correspond to two or more species with chemical shifts similar to that of 1. One of these species may correspond to the Mst analog of 1. Another possible species is µ-oxo-bistrimetaphosphate ([P 3 O 8 -O-P 3 O 8 ] 4-). There are also numerous difficult to assign species with small integrations. While this mixture appears to contain 2, the numerous other species likely result in side products when this mixture is used for phosphorylation reactions.