1
80
Khabarov et al.
1
.5–2 h heating from brown to yellow. The final reaction mixture was cooled in an
ice-water bath and diluted with a 4-fold volume of ice-cold water. The precipitate was
isolated by vacuum filtration, washed with ice-cold water and air dried to produce yellow
ꢀ
ꢀ
6
crystals, 1.059 g (87% yield), mp. 122 C (lit. mp. 122.5 C ). IR: 3105, 1630, 1607, 1526,
¡
1
429, 1339, 1312, 1177, 1148, 1087, 941, 918, 833, 783, 727, 702 cm . ESIMS: m/z
1
calculated for C H N O : 227.99; found: 227.99. Elemental analysis calculated for
6
2 3 7
C H N O : C, 31.45; H, 1.32; N, 18.34. Found: C, 31.39; H, 1.67; N, 18.16.
6 3 3 7
Acknowledgments
The study was performed using the equipment of the Core Facility Center “Arktika” of
Northern (Arctic) Federal University.
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