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It is demonstrated by means of metastable ions characteristics, collisional activation, deuterium labelling and appearance energy measurements that ionized ethyl isobutyl ether and ethyl n‐butyl ether isomerize prior to decomposition. The lower critical energy fragmentation gives [CH3CH2OCHCH3]+ ions. A mechanism of isomerization is proposed in which 1,4 hydrogen migration on the oxygen atom is coupled with rearrangement of the butyl chain.
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Audier et al. (1982) studied this question.
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