Taylor's phosphorylation methodology additionally involves several amine additives, notably DABCO. Treating TriMP with tosyl chloride and DABCO in a one pot procedure gives a complex mixture of products (see S2.3), but isolated 1 reacts cleanly with two equivalents of DABCO to form a ring opened species, an adduct of (P 3 O 8 ) 3-and two DABCO molecules (2, Figure ), as determined by 31 P{ 1 H} NMR. The utility of 1 and 2 as phosphorylation reagents is however hindered by their instability. Even in the crystalline state at -35 • C, 1 shows significant decomposition to a complex mixture after two weeks, and we were unable to isolate 2 without decomposition to a complex mixture of species (See SI).