A new application about 21725-69-9

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Ortho Effects in Shiff Bases of Diaminodicyanoethane

In the electron impact mass spectra of azomethines derived from various substituted aromatic aldehydes and diaminodicyanoethene the superposition of two ortho effects concurring with the azomethine group is apparent: one involving the amino group of the diaminodicyanoethene part accounts for the cyclization to + ions and the other involving ortho substituents of the benzylidene part which can interact with the azomethine moiety is responsible for specific fragment ions, suppressing the typical fragmentations of azomethines.The ortho effect was studied for the o-nitro derivative by labelling experiments, analysis of metastable transitions and collisional activation comparing model ions, demonstrating that the specific +. and +. ions are the result of cyclization processes.

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Reference£º
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics