Formation of oxadiazolo[4,5-a]indolines via addition reactions of cycloalkano[b]indoles with nitrile oxides. Crystal structure of an adduct

Reactions of stable nitrile oxides with cycloalkano[b]indoles gave as main product adducts 3 containing the oxadiazolo[4,5-a]indoline ring system. The structure elucidation of the isolated adducts was based on their spectral data, chemical behaviour and in one case the structure was confirmed by crystallographic X-ray analysis. The mechanism of the reaction is also discussed.     

Reaction of 3-nitro- and 3-diethylphosphonocoumarin with phenacyl bromide. X-ray molecular structure of 3-nitro-3,4-phenacylidenecoumarin

3-Nitro- and 3-diethylphosphonocoumarins 4a,b react with phenacyl bromide stereoselectively under phase-transfer conditions, in the presence of a base and of a transfer agent, to give the cyclopropyl derivatives 6 and 7 in good yields. A mechanistic explanation is given for the stereoselectivity of the reaction. The X-ray molecular structure of compound 6a is also presented.     

Two-qubit correlations via a periodic plasmonic nanostructure

We theoretically investigate the generation of quantum correlations by using two distant qubits in free space or mediated by a plasmonic nanostructure. We report both entanglement of formation as well as quantum discord and classical correlations. We have found that for proper initial state of the two-qubit system and distance between the two qubits we can produce quantum correlations taking significant value for a relatively large time interval so that it can be useful in quantum information and computation processes.