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Soc."},{"key":"ref19\/cit19b","doi-asserted-by":"crossref","first-page":"1224","DOI":"10.1039\/J29680001224","author":"Riddell F. G.","year":"1968","journal-title":"J. Chem. Soc. B"},{"key":"ref19\/cit19c","doi-asserted-by":"crossref","first-page":"1316","DOI":"10.1021\/jo00974a008","volume":"37","author":"Lowry B. R.","year":"1972","journal-title":"J. Org. Chem."},{"key":"ref20\/cit20","unstructured":"The relationship \u0394G\u29e7=RTc(22.96 + ln(Tc\/(\u0394\u03bd2+ 6J2)1\/2) was used to estimate the activation energy (\u0394G\u29e7\/kJmol\u22121) from the coalescence temperature (Tc\/K), the frequency separation of the peaks (\u0394\u03bd\/Hz), and the coupling constant (J\/Hz) between the nuclei (ref16c). The correspondingkcvalue is (\u03c0\/21\/2)(\u0394\u03bd2+ 6J2)1\/2. For the (\u03b1o,\u03b1\u2032o) pair, \u0394\u03bd= 600 Hz and2J= 16.7 Hz in C2D2Cl4at the low-temperature limit (300 K)."},{"key":"ref21\/cit21a","doi-asserted-by":"crossref","first-page":"2203","DOI":"10.1016\/j.tet.2004.12.017","volume":"61","author":"Hayakawa Y.","year":"2005","journal-title":"Tetrahedron"},{"key":"ref21\/cit21b","doi-asserted-by":"crossref","first-page":"185","DOI":"10.1016\/S0022-0728(77)80163-0","volume":"85","author":"Fujinaga T.","year":"1977","journal-title":"J. Electroanal. Chem. Interfac. Chem."},{"key":"ref22\/cit22","unstructured":"TheendoNH+must not be deshielded by strong intramolecular hydrogen bonding."},{"key":"ref24\/cit24a","doi-asserted-by":"crossref","first-page":"4617","DOI":"10.1016\/S0040-4039(01)97544-6","author":"Jacques J.","year":"1971","journal-title":"Tetrahedron Lett."},{"key":"ref24\/cit24b","doi-asserted-by":"crossref","first-page":"1432","DOI":"10.1002\/(SICI)1521-3765(19990503)5:5<1432::AID-CHEM1432>3.0.CO;2-C","volume":"5","author":"Dietrich-Buchecker C.","year":"1999","journal-title":"Chem.\u2014Eur. J."},{"key":"ref24\/cit24c","doi-asserted-by":"crossref","first-page":"8618","DOI":"10.1021\/ic060856q","volume":"45","author":"Warr R. J.","year":"2006","journal-title":"Inorg. Chem."},{"key":"ref24\/cit24d","doi-asserted-by":"crossref","first-page":"72","DOI":"10.1002\/mrc.1916","volume":"45","author":"Eckenroad K. W.","year":"2007","journal-title":"Magn. Reson. 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