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6852372 
Journal Article 
Preparation of magnesium azaphthalocyanines by cyclotetramerisation of S-substituted 4,5-disulfanylpyrazine-2,3-dicarbonitriles 
Morkved, EH; Morkved, EH; Holmaas, LT; Holmaas, LT; Kjosen, H; Kjosen, H; Hvistendahl, G; Hvistendahl, G 
1996 
Yes 
Acta Chemica Scandinavica
ISSN: 0904-213X
EISSN: 1902-3103 
50 
12 
1153-1156 
WOS:A1996VY70900013 
Four novel S-substituted 4,5-disulfanylpyrazine-2,3-dicarbonitriles have been obtained in a multistep synthesis from diaminomaleonitrile. Two of these dicarbonitriles, with ethyl or benzyl S-substituents, give pure magnesium azaphthalocyanines in good yields when reacted with magnesium propoxide in propanol and dioxane. Aromatic S-substituents are less stable during the reaction conditions used for cyclisations, and product mixtures are obtained.< 
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