Study of ion structures produced by the reaction of 2‐propyl cations with water and methanol; covalently bound v. Hydrogen‐bridged adducts

AbstractIn contrast to an earlier report,1 the collisonally induced dissociation of protonated 2‐propanol and t‐butyl alcohol yields spectra that are indistinguishable from those of the corresponding [C3H7/H2O]+ and [C4H9/H2O]+ ions generated by the (formal) gas phase addition reactions in a high pressure ion source of [s‐C3H7]+ and [t‐C4H9]+ ions with the n‐donor H2O. Similarly, [s‐C3H7/CH3OH]+ ions generated by both gas phase protonation of n‐ and s‐propyl methyl ethers and addition reactions of [C3H7]+ to CH3OH display mode‐of‐generation‐independent collisionally induced dissociation characteristics. However, analysis of the unimolecular dissociation (loss of propene) of the [C3H7/CH3OH]+ system, including a number of its deuterium, 13C‐ and 18O‐labelled isotopomers, supports the idea that prior to unimolecular dissociation, covalently bound [C3H7‐ O(H)CH3]+ ions intercovert with hydrogen‐bridged adduct ions, analogous to the behaviour of the distonic ethene‐, propene‐ and ketene‐H2O radical cations.

Study of ion structures produced by the reaction of 2‐propyl cations with water and methanol; covalently bound v. Hydrogen‐bridged adducts Journal Articles