Synthesis and thermal decomposition of cis-3,4,5,6-tetrahydropyridazine-3,4-d2. Relative rates of rotation, cleavage, and closure for tetramethylene
作者:Peter B. Dervan、Donald S. Santilli
DOI:10.1021/ja00531a031
日期:1980.5
are reported. The thermal decomposition of cis-3,4,5,6-tetrahydropyridazine-3,4-d₂ (6 ) (gas phase, 439°C affords 67.1 ± 0.9% cis-ethylene-1,2-d₂, 16.1 ± 0.8% trans-ethylene-1,2-d₂,9.4 ± 0.4% cis-cyclobutane-1,2-dz, and 7.4 f 0.4% trans-cyclobutane-1.2-d₂. The relative rates of rotation, cleavage, and closure for this 1,2-diazene generated tetramethylene-d₂ are k(cleavage)/k(closure) = 2.2 ± 0.2 and
顺式-3,4,5,6-四氢哒嗪-3,4-d 2 (6 )和顺-和反式-环丁烷-1,2-d 2 的立体有择合成已有报道。顺式-3,4,5,6-四氢哒嗪-3,4-d 2 (6)的热分解(气相,439°C得到67.1±0.9%顺式-乙烯-1,2-d2,16.1±0.8% trans-ethylene-1,2-d2,9.4 ± 0.4% cis-cyclobutane-1,2-dz, and 7.4 f 0.4% trans-cyclobutane-1.2-d2. 旋转、裂解和闭合的相对速率 1 ,2-二氮烯生成的四亚甲基-d2 是 k(裂解)/k(闭合) = 2.2 ± 0.2 和 k(旋转)/k(闭合) = 12 ± 3。一个额外的立体特异性裂解成分 (46%) 叠加在 1发现了来自母体四氢哒嗪的 ,4-双自由基途径 (54%),类似于在 3,4-二甲基-3,4,5,6-四氢哒嗪 ermal 反应中观察到的。最后,母体