Search results for "Photochemical reactivity"
showing 6 items of 6 documents
The new era of 1,2,4-oxadiazoles
2009
The synthesis, the chemical and photochemical reactivity, and the use of 1,2,4-oxadiazoles in materials and as bioactive compounds have been reviewed. The material in this survey includes some historical background, general features, state-of-the-art applications together with a critical discussion about current limitations and suggestions for future developments.
Solvent dependent photochemical reactivity of 3-allyloxy-1,2,4-oxadiazoles
2009
Dicopper(II) metallacyclophanes with photoswitchable oligoacene spacers: a joint experimental and computational study on molecular magnetic photoswit…
2018
Dinuclear copper(II) complexes of the metallacyclophane-type, (nBu4N)4[Cu2(2,6-anba)2] (1) and (nBu4N)4[Cu2(1,5-naba)2]·4H2O (2) with photoactive 2,6-anthracene-(2,6-anba) and 1,5-naphthalenebis(oxamate) (1,5-naba) bridging ligands, are reported. They undergo a thermally reversible, solid-state photomagnetic (ON/OFF) switching between the moderately strong antiferromagnetically coupled dicopper(II) species and the corresponding magnetically uncoupled [4+4] photocycloaddition product. Density functional calculations give further insights on the intramolecular (“pseudo-bimolecular”) photocycloaddition reaction of the two facing 2,6-anthracene or 1,5-naphthalene spacers in this novel family of…
New oxygenated eudesmanolides from artemisia herba-alba
1990
Abstract The aerial parts of Artemisia herba-alba Asso subsp.valentina Lam. (Asteraceae) yielded the new eudesmanolides 1-11 and the new sesquiterpene-monoterpene adducts 12-13. The absolute configuration of compound 6 was confirmed with the aid of X-ray diffraction analysis. Some aspects of the thermal and photochemical reactivity of 2,4-cyclohexadienones are discussed.
1972
Photochemical reactivity of 6α-hydroxy, 7-keto neoclerodane diterpenoids
2006
Abstract The photochemical reactivity, in methanol at λ = 254 nm, of two 6α-hydroxy-7-keto neoclerodane, isoeriocephalin ( 1 ) and teucrolivin B ( 2 ) was evaluated. From the first compound, two new products were obtained: the 6β-hydroxy epimer ( 3 ) and the ɛ-lactone ( 4 ). The second one yielded exclusively the new spiro γ-lactone ( 5 ). The formation of these new products can be explained by the well-known radical mechanism Norrish type I.