Pyrromethene-BF2 Complexes as Laser Dyes: 2
Abstract
Pyrromethene-BF2 complexes were obtained from alpha-unsubstituted pyrroles by acylation and condensation to give intermediate pyrromethene hydrohalides followed by treatment with boron trifluoride entherate. Conversion of ethyl alpha-pyrrolecarboxylates to alpha-unsubstituted pyrroles was brought about by thermolysis in phosphoric acid at 160 C, or by saponification followed by decarboxylation in ethanolamine at 180 C, or as unisolated intermediates in the conversion of esters to pyrromethene hydrobromides by heating in a mixture of formic and hydrobromic acids. Addition of hydrogen cyanide followed by dehydrogenation by treatment with bromine converted 3,5,3',5'-tetramethyl-4,4'1- diethylpyrromethene bydrobromide 9 to 3,5,3',5'-tetramethyl-4,4'-diethyl-6- cyanopyrromethene hydrobromide confirmed by the further conversion to 1,3,5,7- tetramethyl-2,6-diethyl-8-cyanopyrromethene-BF2 complex on treatment with boron trifluoride etherate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 02, 1992
- Accession Number
- ADA251185
Entities
People
- A. M. Haag
- G. Sathyamoorthi
- J. H. Boyer
- K. Thangaraj
- M. L. Soong
- T. Pavlopoulos
Organizations
- University of New Orleans