5-substituted (2Z, 4E)-pentadien-aldoximes 6 having (E) (syn)-configuration of the C, N-double bond. The unsaturated oximes are shown to arise through an electrocyclic ring opening reaction from the primary Grignard adducts 5. These can be trapped by protonation at low temperature.
将苯基,烷基,烯基和炔基-
格氏试剂在THF中的
吡啶-N-氧化物中加成后,得到具有(E)(syn)-构型的5-取代的(2 Z,4 E)-
戊二烯-醛
肟6 C,N-双键。所示的不饱和
肟是通过伯尼格氏加合物5的开环反应而产生的。这些可以在低温下被质子化捕获。