73240-57-0Relevant academic research and scientific papers
Attempts to Synthesize Derivatives of the 2,3-Diazabicycloocta-5,7-diene System
Askani, Rainer,Schneider, Wilfried
, p. 2355 - 2365 (2007/10/02)
The 2,3-diazabicycloocta-5,7-diene derivatives 1a and b could neither be obtained by a photoaromatization reaction of 8 nor by an electrolytic oxidation of the dicarboxylic acids 13a,b.Cycloadditions to 21 lead to derivatives of the title system.At temperatures above -10 deg C these undergo a -cycloreversion to produce the tetrahydrophthalazines 22.The thermal transformation of 21 to 22 is rationalized on the basis of a chain mechanism.
PERICYCLIC TRANSFORMATIONS OF TETRACYCLO2,903,8>TRIDECA-4,6,11-TRIENES, AND FORMATION OF DIHYDROSEMIBULLVALENES BY THERMAL INTRAMOLECULAR?4a+?2a>CYCLOADDITION IN SUBSTITUTED CYCLOOCTATRIENES
Lay, W. P.,Mackenzie, K.,Miller, A. S.,Williams-Smith, D. L.
, p. 3021 - 3031 (2007/10/02)
Cyclopentadienones react with certain cyclobutene dienophiles to give the anticipated carbonyl bridge adducts; these, on relatively mild thermolysis, yield dihydrosemibullvalene derivatives by a novel sequence including cheletropic loss of carbon monoxide, electrocyclic ring opening of immediate substituted bicyclooctadienes, and intramolecular ?4a + ?2a>cycloaddition of the derived cyclooctatrienes.Other pericyclic reactions of compounds related to those of the title compounds are also discussed.
