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The hydrogen-carbon, carbon-carbon double rearrangement, responsible for the formation of benzyl or tropylium ions previously observed in the electron ionization mass spectra of several substituted 1,lbis(dimethoxydipheny1)methanes bearing an ortho methoxy group, also occurs for 2-methoxydiphenylmethane (1) itself, the simplest compound of the series. It was shown using deuterium and ''C labelled 2methoxydiphenylmethanes (2, 3) that in this instance benzyl or tropilium ions are also formed through two alternative fragmentation routes.

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