Unsymmetrical ketones and allyltitanocenes generated by the desulfurizative titanation of γ,γ-disubstituted allyl phenyl sulfides react under highly diastereoselective construction of adjacent quaternary stereocenters (see scheme; R(L) = large group, R(S) = small group). The title reaction is stereospecific: the anti- and syn-homoallylic alcohols are obtained by the reaction of E- and Z-allylic...

The selective formation of a single isomer of a [3+2] self-assembled organic cage from a reaction mixture of an unsymmetrical aldehyde and a flexible amine is discussed. The experimental and theoretical findings suggest that in such a process, the geometric features of the aldehyde play a key role.

An unsymmetrical subphthalocyanine trimer consisting of three different subphthalocyanine units was synthesized. Its optical and physical properties were investigated by UV/Vis, fluorescence spectrometry, cyclic voltammetry and computations. Energy transfer from the non-substituted subphthalocyanine unit to the perfluorinated subphthalocyanine unit via a trifluoroethoxy substituted unit is sugg...

The transient heating in an unsymmetrical coated hot–strip sensor was simulated with a self–adaptive finite element method. The first tests of this model show that it can determine with a small error the thermal conductivity of liquids, from the transient temperature rise in the hot–strip, deposited in a substrate and coated by an alumina spray.

A highly enantioselective direct Mannich reaction of methyl alkyl ketones with cyclic imines benzo[e][1,2,3]oxathiazine 2,2-dioxides, catalyzed by the combination of cinchona alkaloid derived primary amine and TFA, is disclosed. For unsymmetrical methyl alkyl ketones, it is favoured that specific regioselective addition to the imine substrates occurs at the less-substituted methyl group by ster...

The title compound, C(26)H(21)N(3)O(2), is an unsymmetrical tetra-dentate Schiff base ligand. The hydr-oxy group forms an intra-molecular O-H⋯N hydrogen bond with an adjacent N atom. An inter-molecular N-H⋯O hydrogen bond creates centrosymmetric dimers in the crystal packing.

An efficient and practical method to a wide range of perfluorinated unsymmetrical diarylmethanes with good to excellent yields and high regioselectivities has been developed by Pd-catalyzed direct benzylation of highly electron-deficient perfluoroarenes; excellent compatibility of functional groups has also been established.

An application of the classical Ritter reaction for the synthesis of unsymmetrical di and trisubstituted ureas catalyzed by FeCl(3) is described. The protocol is of significant interest in view of the easy availability of precursors, mild reaction conditions employed and interestingly its applicability for the alkylation of alcohols capable of forming stable carbocationic intermediates even to ...

The title compound, C(23)H(35)BrO(3), synthesized by esterification and bromination of isosteviol, comprises a fused four-ring system. Two of the six-membered rings adopt a regular chair conformation, whereas the remaining six-membered ring is an unsymmetrical distorted chair. The stereochemistry at the two six-membered ring junctions is trans, while the five-membered ring adopts an envelope co...

In the title compound, C(17)H(16)N(5)O, the central tetra-zine ring adopts an unsymmetrical boat conformation with the two C atoms as flagpoles. This compound can be considered as having homoaromaticity. The crystal structure is stabilized by inter-molecular C-H⋯O inter-actions between a benzene H atom and the carbonyl O atom.