The only products deriving from EA were MEA and ethylene glycol (10% and 3% yields, respectively, based on conversion of EA, of which 87% remained). The assignment of ethylene glycol was made based on the reported chemical shift in D 2 O (Fulmer et al. Organometallics 2010, 29, 2176-2179) and the assignment of MEA was made by comparison with a spectroscopic standard prepared in aqueous phosphate buffer at pH 7.4. Species assigned as deriving from methylation of nucleophiles other than MEA (namely ferrocyanide (a product of the system), water, and cyanide) included [Fe(CN) 5 CNMe] 3-, methanol, and acetonitrile (see above). Slight differences ( 0.1 ppm) between literature chemical shifts and those reported herein may be due to pH effects.