87838-76-4Relevant academic research and scientific papers
endolexo Facial selectivities in cycloaddition reactions of substituted 1,2,3-triazolium-1-methanides, unstabilised 1,3-dipoles, with some alkene dipolarophiles: Models for 1,2,3-triazolium-1-aminides: New tetracyclic pyrrolo[1,2-c][1,2,3]benzotriazole structures: Azolium 1,3-dipoles
Butler,Wallace
, p. 1778 - 1784 (2001)
endolexo Stereochemistry in the cycloaddition reactions of substituted 1,2,3-triazolium-1-aminide and 1,2,3-triazolium-1-methanide 1,3-dipoles has been explored for the dipolarophiles acrylonitrile and N-substituted maleimides. The cycloadditions with acrylonitrile displayed predominant endo-geometry but gave mixtures of endo- and exo-isomers. In contrast N-substituted maleimides gave almost exclusive exo-cycloadducts. The cycloaddition products are novel tri- and tetracyclic structures. Factors affecting endolexo selectivities are discussed for these systems. Generalisations are not reliable and each 1,3-dipole-dipolarophile pair needs to be carefully considered.
Azapropellanes: New Fused Tetra-azatriazolo1,x>-dodecenes and tridecenes. Substituted 3,3a,4,5,6,6a-Hexahydropyrrolo-1,2,3-triazoles from a General Tandem Cycloaddition-Rearrangement Reaction of 1,2,3-Triazolium Imides with Subst
Butler, Richard N.,Evans, Ann M.,Gillan, Ann M.,James, John P.,McNeela, Eithne M.,et al.
, p. 2537 - 2544 (2007/10/02)
Reactions of substituted 1,2,3-triazolium-1-imide 1,3-dipoles with a range of substituted alkene and alkyne dipolarophiles gave rise to derivatives of the new ring systems hexahydropyrrolo-1,2,3-triazoles and the azapropellanes tetra-aza-tricyclo5
A New Fused Tricyclic Tetra-aza1,6>dodecene System: Substituted 3,3a,4,5,6,6a-Hexahydropyrrolo-1,2,3-triazoles from the Reaction of Acrylonitrile with cis-1,2-Bis(areneazo)ethylenes and a Re-assessment of 1,3-Cycloaddition Produc
Butler, Richard N.,Cunningham, D.,James, John P.,McArdle, Patrick
, p. 762 - 763 (2007/10/02)
The thermal reaction of cis-1,2-bis(areneazo)ethylenes with acrylonitrile gave substituted 3,3a,4,5,6,6a-hexahydropyrrolo-1,2,3-triazoles with a saturated bridgehead which, when fused to a cyclohexyl ring, constituted a tricyclic tetra-azadodecene
