N-Chloro-N,N′,N′-tris(ethoxycarbonyl)hydrazine and N,N-dichloro-N′,N′-bis(ethoxycarbonyl)hydrazine: synthesis, stability and reactions with nucleophiles
作者:Vladimir Benin、Piotr Kaszynski、J George Radziszewski
DOI:10.1016/s0040-4020(02)00101-1
日期:2002.3
N-Chloro-N,N′,N′-tris(ethoxycarbonyl)hydrazine (1b) was prepared in 27% yield by chlorination of N,N,N′-tris(ethoxycarbonyl)hydrazine anion with t-BuOCl. The reaction of 1b with CN(−) gave the product of N-substitution. Attempts at chlorination of N,N-bis(ethoxycarbonyl)hydrazine (2a) with t-BuOCl did not yield the expected N,N-dichloro-N′,N′-bis(ethoxycarbonyl)hydrazine (1a), and led to the exclusive
通过用t- BuOCl氯化N,N,N'-三(乙氧基羰基)肼阴离子,以27%的收率制得N- Chloro- N,N ',N'-三(乙氧基羰基)肼(1b)。1b与CN(-)的反应得到N-取代的产物。尝试用t- BuOCl氯化N,N-双(乙氧羰基)肼(2a)不会产生预期的N,N-二氯-N ',N'-双(乙氧羰基)肼(1a),并导致ClCOOEt的排他性形成。使用DFT计算评估了1a和1b的分解机理和相对稳定性,并将其与母体氯肼的分解机理和相对稳定性进行了比较(3)。