Antiaromatic compounds — 24. Steric effects on valence isomerizations in the dewar pyridine/azaprismane/pyridine system

Base‐Induced Condensation of α‐Chloro Oxime Derivatives Furnishes Alkynes

“…Azacyclobutadiene (azete) is a highly reactive and unstable molecule, the physical properties of which have been investigated experimentally and theoretically 2. Although the reaction of an isolable azacyclobutadiene kinetically stabilized by bulky substituents has been reported,2d–f the utility of such compounds in organic synthesis has remained largely unexplored. In particular, azacyclobutadiene is known to undergo [2+2] cycloreversion to provide acetylene and hydrogen cyanide (Scheme ) 2b,h.…”

Synthesis and Reactivity of 2-(Carboxymethyl)aziridine Derivatives

“…Synthesis of polycyclic 2-(carboxymethyl)­aziridine derivatives via photochemical rearrangements has been extensively reported in the literature. − …”

Phosphaalkynes: new building blocks in synthetic chemistry

“…The recently prepared tri-terf-butylazete (178)146 is also very amenable to cycloaddition reactions and represents an ideal starting material for the study of the valency isomers of pyridines bearing sterically demanding substituents by means of its reaction with acetylenes and the thermally and photochemically induced subsequent reactions of the products thus obtained. [147][148][149][150] Bi-, tri-, and tetracyclic isomers of aza-phosphabenzenes151 are also analogously accessible from the reactions of 178 with phosphaalkynes.…”