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0001941899
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+] cycloaddition with 1,3-dienes in the gas phase, see: a) M. N. Eberlin, N. H. Morgon, S. S. Yang, B. J. Shay, R. G. Cooks, J. Am. Soc. Mass Spectrom. 1995, 6, 1;
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29
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85037478625
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note
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The gaseous 4-pyrimidyl cation 5 appears to undergo facile "charge-induced ring opening" to form a more stable acyclic isomer, see ref. [4a].
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31
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0013369386
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b) T. Kauffmann, R. Wirthwein, Angew. Chem. 1971, 83, 21; Angew. Chem. Int. Ed. Engl. 1971, 10, 20.
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Kauffmann, T.1
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32
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0343470860
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b) T. Kauffmann, R. Wirthwein, Angew. Chem. 1971, 83, 21; Angew. Chem. Int. Ed. Engl. 1971, 10, 20.
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, vol.10
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33
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85037472588
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note
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Under reaction conditions similar to those used for 1 and 2, the phenyl cation reacts with 1,3-butadiene and isoprene predominantly by proton transfer.
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34
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85037456205
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note
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For simplicity, only the formation of the ortho-cycloadduct is considered.
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36
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84993869502
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For the condensed-phase synthesis and properties of indolizines (pyrrolo[1,2-a]pyridines) and derivatives, see: a) T. Uchida, K. Matsumoto, Synthesis 1976, 209;
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(1976)
Synthesis
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Uchida, T.1
Matsumoto, K.2
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38
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0347606904
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Indolizine (pyrrolo[1,2-a]pyridine) was synthesized according to the classic Scholtz reaction: M. Scholtz, Ber. 1912, 45, 734.
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(1912)
Ber.
, vol.45
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Scholtz, M.1
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39
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85037466986
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note
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The minor differences observed in the relative abundances of fragments on comparison of Figure 6 and Figure 3 a probably result from the slightly different experimental setups and collision conditions (collision gas pressures and energies).
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40
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85037448009
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note
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Negligible activation barrier for ring-closure and reverse activation barrier for ring-opening, are assumed.
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