The molecular structure and charge density distribution in the crystal of [2.2]paracyclophane derived from the high-resolution single crystal X-ray diffraction data at 100 K is reported together with ab initio calculations of this molecule. Analysis of the atomic, anisotropic displacement parameters in a "rigid-body" model approximation has revealed that the molecule is ordered in the crystal. Topological analysis of the electron density and potential-energy density-distribution functions has demonstrated that there is no "through-space" interaction between the rings in the molecule. The role of the ethylene bridges and distortion of the aromatic desks on the inter-ring interaction are discussed.

nitriles nitriles (benzene compounds) Q 0520 -125Asymmetric Trimethylsilylcyanation of Benzaldehyde Catalyzed by (Salen)Ti(IV) Complexes Derived from (R)-and/or (S)-4-Hydroxy-5-formyl[2.2]paracyclophane and Diamines.-A method for the catalytic, asymmetric preparation of cyanohydrins, versatile intermediates in organic synthesis, is presented using enantiomerically pure, cyclophane-based (salen)Ti(IV) complexes as catalysts. -(BELOKON, Y.; MOSCALENKO, M.; IKONNIKOV, N.; YASHKINA, L.; ANTONOV, D.; VORONTSOV, E.; ROZENBERG, V.; Tetrahedron

For the first time we report syntheses of a family of functional polyphenylenepyridyl dendrons with different generations and structures such as focal groups, periphery, and a combination of phenylene and pyridyl moieties in the dendron interior using a Diels−Alder approach and a divergent method. The dendron structure and composition were confirmed using NMR spectroscopy, MALDI-TOF mass spectrometry, FTIR, and elemental analysis. As a proof of concept that these dendrons can be successfully used for the development of nanocomposites, synthesis of iron oxide nanoparticles was carried out in the presence of thermally stable dendrons as capping molecules followed by formation of Pd NPs in the dendron shells. This resulted in magnetically recoverable catalysts exhibiting exceptional performance in selective hydrogenation of dimethylethynylcarbinol (DMEC) to dimethylvinylcarbinol (DMVC).

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