1887

oa South African Journal of Chemistry - Synthesis of new benzocoumaryl oxadiazolyls as strong blue-green fluorescent brighteners : research article

Volume 64, Issue 1
  • ISSN : 0379-4350

 

Abstract

The benzocoumarin-3-ethylcarboxylate on treatment with hydrazine hydrate at room temperature afforded benzocoumarin-3-carbohydrazide . The compound served as key intermediate in the synthesis of the title compounds. Thus, benzocoumarin-1,3,4-oxadiazolyls were obtained in two ways, one by direct cyclization of benzocoumarin-3-carbohydrazide with substituted benzoic acids in POCl and the other by cyclization of Schiff bases of compounds in the presence of bromine/acetic acid. The structures of the novel benzocoumaryl oxadiazolyls were confirmed by spectral analysis. The benzocoumarin-1,3,4-oxadiazolyls exhibited strong blue and green fluorescent properties. The Stoke's shifts range from 43 to 165 nm. The absorption and fluorescence maxima of the benzocoumaryl oxadiazolyls showed good bathochromic shifts.

Loading full text...

Full text loading...

Loading

Article metrics loading...

/content/chem/64/1/EJC24555
2011-01-01
2016-12-10

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error