Photochemistry of diaryl ketones: a new photocyclization reaction

Abstract

The photochemistry of oximes of aldehyde and ketones has been extensively studied. The reactions these systems

Developments in cycloproparene chemistry

“…178 The alkylidene derivatives invariably show the molecular ion as the base peak of a simple spectrum.110,141 The proposition of cycloproparenyl cations and radical cations as mass spectral fragmentation products continues. 179 Perhaps more important is the recorded fragmentation of radical anion 168 as this provides the first example of a cycloproparenyl anion and radical anion in negative-ion mass spectrometry.180 16 The compound is a stable, crystalline solid when stored in an inert atmosphere, and its spectral properties are fully commensurate with its cycloproparene character. Ultraviolet absorption is recorded at 264 nm (cf.…”