Etudes cinétiques et conformationnelles par résonance magnétique nucléaire-XIV

Conformational effects in 2,3-cycloalkyl-2,3-diazabicyclic tetraalkylhydrazines

“…The larger interaction by the PE criterion of larger An(unsat) -An(sat) for 10 than 4 (Scheme III) is corroborated by consideration of Xmax for the -* * UV band of these compounds. 20 Lehn and co-workers report an n-*-r* band at 266 nm (e 680) for 4 in cyclohexane,20 whereas 2 only shows an inflection point near 270 nm. 5 The -+ * band for 10 appears as a distinct maximum, Xmax 300 nm (e 710) in hexane.…”