SQUARIC DIAMIDINE AND AN AZA ANALOG OF BIPHENYLENE

[11] MASON AT, 1893, J CHEM SOC, V63, P1293

[12] PUTTER H, 1970, THESIS U WURZBURG

[13] SYNTHESIS OF CYCLOBUTA[B]QUINOXALINES [J]. CHEMICAL COMMUNICATIONS, 1968, (11) : 598 - &

[11] MASON AT, 1893, J CHEM SOC, V63, P1293

[12] PUTTER H, 1970, THESIS U WURZBURG

[13] SYNTHESIS OF CYCLOBUTA[B]QUINOXALINES [J]. CHEMICAL COMMUNICATIONS, 1968, (11) : 598 - &