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Paper | Regular issue | Vol 43, No. 9, 1996, pp.1873-1886
Published online, 1st January, 1970
DOI: 10.3987/COM-96-7410
Synthesis and 13C-Nmr Studies of Quinoxaline Spirans and Carboxyureides

Petrus J. Zeegers* and Malcolm J. Thompson

*Department of Chemistry, The Flinders University of South Australia, PO Box 2100 Adelaide SA 5001, Australia


New quinoxaline spirans were synthesized by the condensation reaction between alloxan and a series of 2-amino-N,N-dimethylanilines derived from substituted nitrophenols. The spiro compounds were then subjected to treatment with hydrogen peroxide in acidic media. This procedure leads to the formation of coloured compounds which were previously proposed to be parabanic acid imines. This study shows the compounds to be quinoxaline carboxyureides.