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,
Refined Insight in Stereochemical and Directional Features of the FeI-Mediated Dehydrogenation of Tetralin
作者:Katrin Seemeyer、Helmut Schwarz
DOI:10.1002/hlca.19930760624
日期:1993.9.22
Experimental results demonstrate that, in the course of gas-phase Fe+-mediated dehydrogenation of tetralin, the metal ion sticks to the same plane of the hydrocarbon surface. The study of 5-substituted, labeled tetralin analogues reveal the operation of an interesting substituent effect: Steric hindrance imposed by a CH3 group at C(5) deflects the metal to the more easily accessible region of C(1)/C(2);
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.
Products, radical intermediates, and hydrogen atom production in the thermal decomposition of 1,2-dihydronaphthalene
作者:James A. Franz、Donald M. Camaioni、Robert R. Beishline、Don K. Dalling