A13C NMR study of some di-, tetra-, and hexa-hydropyridazines
作者:Thomas H. Fisher、Jody C. Crook、Shiching Chang
DOI:10.1016/s0040-4020(01)81649-5
日期:——
The room-temperature 13C nmr spectra of ten hydropyridazines were analyzed in an attempt to determine the most stable conformatlons(s) of each. In contrast to earlier findings, dihydropyridazine 1 was found to be planar. The most stable conformations of tetrahydropyridazines 2b and 2d were found to be half-chairs, while tetrahydropyridazines 3b and 3c were most probably in boat configurations with
分析了十种氢哒嗪的室温13 C nmr光谱,以试图确定每一种的最稳定构象。与早期发现相反,发现二氢哒嗪1是平面的。发现四氢哒嗪2b和2d的最稳定构象是半椅子,而四氢哒嗪3b和3c最可能是在船构型中,3,6-取代基都位于假赤道位置。4,5-二溴六氢哒嗪4a和4b的13 C nmr光谱与通过轴向-赤道氮反转形成的三个椅子构象的混合物一致。
JENSEN, FRANK;FOOTE, CHRISTOPHER S., J. AMER. CHEM. SOC., 109,(1987) N 21, 6376-6385