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1642624018
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0004435012
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M. J. S. Dewar, Y. C. Yuan, J. Am. Chem. Soc. 1990, 112, 2088; M. J. S. Dewar, Y. C. Yuan, J. Am. Chem. Soc. 1990, 112, 2095.
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1642592986
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note
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1.
-
-
-
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18
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-
1642608526
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-
note
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3, neutralization of III may proceed through several pathways, including transfer of the methyl cation to the walls of the reaction vessel or to adventitious acceptors, initially present in the mixture or generated by its radiolysis.
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-
-
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20
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0000053181
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Preparation of these standard compounds has been carried out according to: P. J. Stang, M. G. Mangum, J. Am. Chem. Soc. 1975, 97, 1459.
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1642592985
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note
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- under conditions identical to those of Table 1.
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22
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0000385972
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and references therein
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1. See also E. Dodziuk, H. von Voithenberg, N. L. Allinger, Tetrahedron 1982, 38, 2811, and references therein.
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23
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1642624014
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note
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3 dihedral angles of IVs and IVa calculated at the B3LYP/6-31G* level of theory are 100.4 and 97.0, respectively.
-
-
-
-
24
-
-
1642624015
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-
note
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3 at the carbon centers of the freed onium ion. Thus, only a fraction of the back-dissociating hydrogen-bonded adducts collapse again to another hydrogen-bonded adduct.
-
-
-
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25
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1642624019
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note
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e conversion, which efficiently competes with the ring-opening reactions.
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26
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