Laser Flash Photolysis Studies of Oxygen and Sulfur Atom Transfer Reactions from Oxiranes and Thiiranes to Singlet Carbenes<sup>1</sup>
作者:John Paul Pezacki、Paul D. Wood、Timothy A. Gadosy、Janusz Lusztyk、John Warkentin
DOI:10.1021/ja973469b
日期:1998.9.1
rate constants for the transfer of oxygen and sulfur atoms to these carbenes have been determined in both acetonitrile and cyclohexane solvents. These carbenes abstract oxygen and sulfur atoms with bimolecular rate constants ranging from 104 to 1010 M-1 s-1 at 22 °C. Ylides from attack of carbenes onto heteroatom donors were not observed for any of the heteroatom transfer reactions. It was found t...
苄基氯二氮嗪 (1a)、苯基氯二氮嗪 (1b)、苯基甲氧基二氮嗪 (1c)、2,2-二甲氧基-5,5-二甲基-Δ3-1,3,4-恶二唑啉 (6a) 的激光闪光光解 (UV-LFP) 研究, 3,4-二氮杂-2,2-二甲氧基-1-氧杂[4.3]螺辛-3-烯(6b), 5',5'-二甲氧基螺[金刚烷]-2,2'-[Δ3-1,3, 4-恶二唑啉] (6c) 和重氮芴 (DAF) 在环氧乙烷和硫杂丙烷存在下被报道。这些化合物在辐照后分别生成苄基氯卡宾 (2a)、苯基氯卡宾 (2b)、甲氧基苯基卡宾 (2c)、二甲基卡宾 (8a)、环丁叉 (8b)、金刚烷基 (8c) 和芴基 (FL)。已在乙腈和环己烷溶剂中测定了氧和硫原子向这些卡宾的转移的绝对速率常数。这些卡宾在 22 °C 下提取氧和硫原子,双分子速率常数范围为 104 到 1010 M-1 s-1。对于任何杂原子转移反应,都没有观察到卡宾攻击杂原子供体的叶立德。它被发现