N-hydroxypyridine-2-thione carbamates. IV. A comparison of 5-exo cyclizations of an aminyl radical and an aminium cation radical
作者:Martin Newcomb、Thomas M. Deeb、Donald J. Marquardt
DOI:10.1016/s0040-4020(01)82012-3
日期:1990.1
N-butyl-4-pentenaminyl radical and the N-butyl-4-pentenaminium cation radical were studied. The radicals were produced in chain reactions from the same N-hydroxypyridine- 2-thione carbamate precursor. Rate constants for cyclization of the aminyl radical and ring opening of the product thus formed at 50 °C were determined. Cyclizations of the aminium cation radical, formed by protonation of the aminyl radical, were
研究了N-丁基-4-戊烯丙基和N-丁基-4-戊烯阳离子的环化。自由基是由相同的N-羟基吡啶-2-硫酮氨基甲酸酯前体在链反应中产生的。确定了在50℃下氨化自由基环化的速率常数和由此形成的产物的开环。在各种条件下,研究了由氨基自由基的质子化形成的铵阳离子自由基的环化。