Concerted Eliminations Following Simple Cleavage

FIGURE 9.37 Electron ionization mass spectrum of 1,2,3,4-tetrahydronaphthalene and retro Diels-Alder reaction from the molecular ion. 

FIGURE 9.38 The O cleavage followed by charge-induced elimination of pentene. 

FIGURE 9.39 Charge-induced heterolytic cleavage of a o bond and consecutive elimination of carbon monoxide. 

FIGURE 9.40 Eliminations of dihydrogen (top) and methane (bottom) from am/z 71 ion. 

FIGURE 9.42 Three ways of writing elimination via four-membered transition state. 

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