DIPOLAR CYCLOADDITIONS OF SEVERAL MESOIONIC COMPOUNDS WITH TERT-BUTYLFULVENE DERIVATIVES - VERSATILE REACTIONS, STERICALLY CONTROLLED [4-PI-PI] CYCLOADDITIONS AND A NEW ROUTE TO HETEROCYCLES ISOELECTRONIC WITHAZULENE(6)
H. Kato et al., DIPOLAR CYCLOADDITIONS OF SEVERAL MESOIONIC COMPOUNDS WITH TERT-BUTYLFULVENE DERIVATIVES - VERSATILE REACTIONS, STERICALLY CONTROLLED [4-PI-PI] CYCLOADDITIONS AND A NEW ROUTE TO HETEROCYCLES ISOELECTRONIC WITHAZULENE(6), Chemical communications, (9), 1996, pp. 1011-1012
Several mesoionic compounds react with 2-tert-butylfulvene derivatives
to form [4 pi + 2 pi] and [4 pi + 6 pi] cycloadducts, which under the
reaction conditions, undergo further fragmentation, elimination, or i
somerization giving a variety of products including several condensed
heterocycles which are isoelectronic with azulene.