Dioxygenase-catalysed oxidation of dihydronaphthalenes to yield arene hydrate and cis-dihydro naphthalenediols
作者:Derek R. Boyd、Narain D. Sharma、Nuala A. Kerley、R. Austin S. McMordie、Gary N. Sheldrake、Paul Williams、Howard Dalton
DOI:10.1039/p19960000067
日期:——
trihydroxylation and dehydrogenation. The arenehydrates, (R)-1,2-dihydronaphthalen-l-ol 5 and (R)-1,4-dihydronaphthalen-l-ol 7, were isolated as enantiopure metabolites while 1,2-dihydronaphthalen-2-ol 8 was found in almost racemic form. The structure, enantiopurity and absolute stereochemistry of these arenehydrates of naphthalene were confirmed by chemical synthesis. Deuterium labelling studies,
Competition H(D) Kinetic Isotope Effects in the Autoxidation of Hydrocarbons
作者:Hubert Muchalski、Alexander J. Levonyak、Libin Xu、Keith U. Ingold、Ned A. Porter
DOI:10.1021/ja511434j
日期:2015.1.14
both the primary and secondary isotopeeffects for symmetrical substrates by the use of NMR. Intramolecular competition reactions were carried out on substrates having an increasing number of deuterium atoms at symmetry-related sites. Products that arise from peroxyl radical abstraction at each position of the various substrates reflect the competition rates for H(D) abstraction. The primary KIE for
氢原子转移是许多重要自由基链序列的核心。我们在此报告了一种使用 NMR 测定对称底物的初级和次级同位素效应的方法。在对称相关位点具有越来越多氘原子的底物上进行分子内竞争反应。在各种底物的每个位置上由过氧自由基抽象产生的产物反映了 H(D) 抽象的竞争率。四氢化萘自氧化的主要 KIE 被确定为 15.9 ± 1.4,该值超过了 H(D) 零点能量差异预测的最大值 (∼7),强烈表明过氧自由基对 H 原子的夺取发生在大量的量子力学隧道效应。
Holland, Herbert L.; Brown, Frances M.; Munoz, Benito, Journal of the Chemical Society. Perkin transactions II, 1988, p. 1557 - 1564
作者:Holland, Herbert L.、Brown, Frances M.、Munoz, Benito、Ninnis, Ronald W.
DOI:——
日期:——
Competing Regiochemical Pathways in the Heck Arylation of 1,2-Dihydronaphthalene
作者:Kenji Maeda、Edward J. Farrington、Erwan Galardon、Benjamin D. John、John M. Brown
The Heck reaction of aryl iodides with 1,2-dihydronaphthalene has been examined. Two separate reaction pathways are observed under all the conditions tried. Arylation adjacent to the aromatic ring leads to a subsequent double bond shift such that the product is a 1-aryl-1,2-dihydronaphthalene. The alternative regiochemistry leads to production of the corresponding 3-aryl-1,2-dihydronaphthalene, and labelling studies with specifically deuterated alkenes demonstrate that this is most likely to be the result of a trans Pd-H elimination pathway. The ratio always varies between 75:25 in favour of the 3-aryl product (Jeffery conditions) to 70:30 in favour of the 1-aryl product.
Barr, Stephen A.; Bowers, Nigel; Boyd, Derek R., Journal of the Chemical Society. Perkin transactions I, 1998, # 20, p. 3443 - 3451
作者:Barr, Stephen A.、Bowers, Nigel、Boyd, Derek R.、Sharma, Narain D.、Hamilton, Lynne、Austin、McMordie、Dalton, Howard