2-Vinyl-1.3-dioxolenium- und 4-Methyl-γ-lactonium-Spezies aus Ethylenacetalderivaten via Elektronenstoßionisation / Electron Impact Induced Formation of 2-Vinyl-1,3-dioxolenium- and 4-Methyl-γ-lactonium Species from Ethylenacetal Derivatives | Publicación