Reaction of 1, 1′, 2,2′-Tetrakis (phenylamino) Ethane with Glyoxal; Synthesis of N~2, N~3, N~7, N~8,1,4,5,6,9,10 -Decaphenyltetradecahydro - dipyrazino [2,3-b: 2,3-e] Pyrazine-2,3,7,8-Tetraamine and 5,6-bis (ethoxy)-N~2, N~3, 1, 4 -Tetraphenylhexahydro

摘要

Compound N~2, N~3, N~7, N~8, 1, 4, 5, 6, 9, 10-decaphenyltetradecahydrodtpyrazino [2, 3-b: 2, 3-e] pyrazine-2, 3, 7, 8-tetraamine (4) was prepared by condensation of 1, 1′ 2, 2′-tetrakis (phenylamino) ethane (1d) and glyoxal in EtOH or i-PrOH. Also, reaction of 1d with glyoxal in equimolare in EtOH resulted 5,6-bis (ethoxy)-N~2, N~3, 1, 4-tetraphenylhexahydro-2, 3-pyrazinediamine (5). The natures of products are sensitive to acidity, temperature and solvent. In acidic media, 4 and 5 are unstable and degraded to diimine 6.