Collision-induced dissociations of deprotonated phosphorus esters. Specific proton transfer accompanying fragmentation
Abstract
The collision-induced dissociations of deprotonated phosphorus esters are dominated by elimination of neutral species from the alkoxy groups with accompanying proton rearrangement. For example, [(MeO)2P(CH2)(O)]– eliminates CH2O and CH2 with specific proton transfer to carbon to produce, respectively, (MeO)(Me)PO– and (MeO)(Me)PO2–, whilst [(EtO)2P(CH2)(O)]– similarly eliminates MeCHO and C2H4. The loss of C2H4 from this ion occurs by the competitive losses of CH2CH2 and MeCH; both losses form the product ion Me(EtO)PO2–. Thus neutral eliminations are accompanied by specific proton transfer to carbon.