Photochemistry of Aryl <i>tert</i>-Butyl Ethers in Methanol: The Effect of Substituents on an Excited State Cleavage Reaction
作者:D. P. DeCosta、A. Bennett、A. L. Pincock、J. A. Pincock、R. Stefanova
DOI:10.1021/jo0002893
日期:2000.6.1
from photo-Fries reaction. The corresponding 4-cyanophenyl 1-adamantyl ether, 9, also gave 1-methoxyadamantane 16 (16%), indicating that, at least for this ether, some of the products were ion-derived. Quenching studies with 2,3-dimethylbutadiene for the tert-butyl ethers indicated that these reactions were occurring from the singlet excited state. Rate constants for the reaction, obtained from quantum
一组10个取代的芳基叔丁基醚8a-j在甲醇中的光解得到主要产物,相应的苯酚以及由光-弗里斯反应产生的叔丁基取代的苯酚。相应的4-氰基苯基1-金刚烷基醚9,也得到了1-甲氧基金刚烷16(16%),表明至少对于该醚而言,一些产物是离子衍生的。用2,3-二甲基丁二烯对叔丁基醚进行猝灭研究表明,这些反应是从单重态激发态发生的。从量子产率和单重态寿命获得的反应速率常数与sigma(h)()(nu)值合理相关,rho = -0.77(r = 0.975),这对于反应是出乎意料的其中在过渡态中断裂的键的极性预期为-O(delta-)。