Photochemical reactivities of cyclic α-phenyl-β,γ-enones. Singlet 1,3-acyl shift, decarbonylation and unquenchable oxa-di-π-methane reactions upon direct irradiation
作者:Margareth J. C. M. Koppes、Hans Cerfontain
DOI:10.1002/recl.19881070906
日期:——
The photochemistry of the α-phenyl-β,γ-enones 3–6 has been studied under conditions of direct (λ 300 nm) and triplet-sensitized irradiation.
A selective solvent-free self-condensation of carbonyl compounds utilizing microwave irradiation
作者:Lalit Kumar Sharma、Kyung Bo Kim、Gregory I. Elliott
DOI:10.1039/c1gc15164a
日期:——
An environmentally benign microwave-assisted solvent-free self-condensation of carbonyl compounds was developed using catalytic amounts of triethylamine and lithium perchlorate. Changing the amount of lithium perchlorate helps in controlling the ratio of the single-condensation and double-condensation products. The effect of other additives and microwave activation was also investigated. The optimized conditions were then applied to various cyclic/acyclic ketones and aldehydes, with selectivity observed in many cases.
Rate Dependence of Serrated Flow During Nanoindentation of a Bulk Metallic Glass
作者:C. A. Schuh、T. G. Nieh、Y. Kawamura
DOI:10.1557/jmr.2002.0243
日期:2002.7
Plastic deformation of Pd-40Ni-20P bulk metallic glass (BMG) was investigated by instrumented nanoindentation experiments over a broad range of indentation strain rates. At low rates, the load-displacement curves during indentation exhibited numerous serrations or pop-ins, but these serrations became less prominent as the indentation rate was increased. Using the tip velocity during pop-in as a gauge
New antioxidants incorporating indole and indoline chromophores
作者:David W Brown、Paul R Graupner、Malcolm Sainsbury、Howard G Shertzer
DOI:10.1016/s0040-4020(01)87108-8
日期:1991.1
Syntheses of potent antioxidants utilising indenoindole or indenoindoline pharmacophores are described. The antioxidant behaviour and the oxidation potentials of these compounds are correlated, and some of their reactions with radicals are noted.
Ingold; Thorpe, Journal of the Chemical Society, 1919, vol. 115, p. 150