Abstract
The title compounds 7, 9, and 11 are obtained by tetramerization of diethyl (3,4-dicyanophenyl)phosphonate (5), ethyl (3,4-dicyanophenyl)phenylphosphinate (8), and 4-(diphenylphosphinyl)benzene-1,2-dicarbonitrile (10). The P-31-NMR spectra of the phthalocyanines 7, 9, and 11 and of their metal complexes present five to eight signals confirming the formation of four constitutional isomers with the ...
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