949-41-7Relevant articles and documents
Excited state carbon acid dissociation and competing photoarrangements of 5H-dibenzo[a,c]cycloheptene derivatives
Budac,Wan
, p. 1447 - 1464 (2007/10/03)
Structure reactivity studies of excited singlet state carbon acid dissociation and competing formal di-π-methane rearrangement have been carried out to gain more insights on the photochemistry displayed by these compounds. Photolysis in the presence of ethanolamine resulted in stereoselective deprotonation of the pseudo-axial proton. The results show that excited state carbon acid dissociation is a general reaction of dibenzo and dinaphtho cycloheptenes only if photochemical pathways are not competing.
Approaches to 1H-Cyclopropaphenanthrenes. Eliminations with 1a,9b-Dihydro-1H-cyclopropaphenanthrene Derivatives
Mueller, Paul,Thi, Huong Can Nguyen,Pfyffer, Jean
, p. 855 - 864 (2007/10/02)
Base-induced elimination of the sulfonium salt 2i in the presence of furan affords the addition products 7 and 8, derived from 1H-cyclopropaphenathrene (1) and the isomeric cyclopropene 5a (Scheme 3).Upon oxidation, the selenide 2c yields phenanthrene-9-methanol (9), presumably via 1.No evidence for the intermediate 1 is obtained from sulfoxide pyrolysis with 2e, which leads to products formed by radical pathways (Scheme 5).Reductive elimination of the disulfone 3b gives half-reduction to monosulfone 2g and complete reduction to cyclopropane 2 as well as 9-methylphenanthrene (15), but no evidence for the intermediate 1.