Untersuchungen über das Pinakolin aus dem Pinakon des Methyläthylketons

Ohne ZusammenfassungZum Schlusse gestatten wir uns, unserem hochverehrten Lehrer Herrn Hofrat Lieben sowie Herrn Professor Dr. Pomeranz für die vielen fördernden Ratschläge, die sie uns bei der Arbeit erteilten, unseren besten Dank auszusprechen.     

Electroactive C3 symmetric discotic liquid-crystalline triindoles

Discotic liquid crystals based on triindole, a novel redox active central core, have been synthesized and their mesomorphic behaviour investigated.     

Photolysis of 10,10-difluorophenanthren-9(10H)-one. Evidence for solvent-assisted α-cleavage

The photolysis of 10,10-difluorophenanthren-9(10H)-one 1 in different solvents shows that the major competing reaction of the diradical formed by α-cleavage: recombination and hydrogen atom abstraction depends on the hydrogen atom donating ability of the solvent. Photolysis of 1 in cyclohexane in the presence of air or oxygen leads mainly to α-cleavage while photoreduction with the formation of 10-fluoro-9-phenanthrol occurs when the solution is deaerated prior to irradiation. In acetonitrile, a poor hydrogen donor, recombination of the diradical back to starting compound 1 is the sole process.     

Synthesis of C3 benzo[1,2-e:3,4-e':5,6-e"]tribenzo[l]acephenanthrylenes ("crushed fullerene" derivatives) by intramolecular palladium-catalyzed arylation

The C60 polyarenes 4, 5, 18 a, and 18 b have been synthesized from truxene by triple alkylation at C5, C10, and C15 followed by a palladium-catalyzed intramolecular arylation. The synthesis of "crushed fullerene" C60H30 (2) is the most efficient reported to date and proceeds in 33% overall yield.     

Crystal Structure of a New Triply‐Bridged Cobalt(III) Dimer with 2, 2′‐Dipyridylamine (dipyam), [Co2(μ‐OH)2(μ‐OAc)(OAc)2(dipyam)2]AcO·EtOH

The structure of [Co₂(μ‐OH)₂(μ‐OAc)(OAc)₂(dipyam)₂]AcO · EtOH ( 1 ) has been determined by single‐crystal X‐ray analysis. The cationic complex may be described as a “di(μ‐hydroxo)(μ‐acetato)dicobalt(III)” core with chelating 2, 2′‐dipyridylamine and monodentate acetate ligands. The coordination polyhedron around each cobalt atom is a distorted octahedral. The dimers are linked in the crystal by N‐H···O_{ionic AcO} and C‐H···O_{monodentate AcO} hydrogen bonds. Spectroscopic data are also presented.     

Kinetic resolution of chiral racemic alcohols by BITIANP–ruthenium(II)‐catalysed hydrogenation

Chiral allylic secondary alcohols have been resolved efficiently by catalytic hydrogenation with ruthenium complexes derived from the new chiral atropisomeric (R)‐ and (S)‐BITIANP. These catalytic sistems have been applied to the resolution of NCS‐382, a selective antagonist of the γ‐hydroxybutyric acid (GHB) receptors. NCS‐382 may play a role as a central neuromodulator and possesses several neuropharmacological properties that can be investigated in detail only if both eutomer and distomer are available in bulk. Copyright © 2000 John Wiley & Sons, Ltd.     

One teflon-like channelled nanoporous polymer with a chiral and new uninodal 4-connected net: sorption and catalytic properties

Zn(C17H8F6O4) is the first example of a fluoro-lined nanotube organo-inorganic 3D polymeric chiral structure, which possesses two different types of isolated channels, one of them being laid out with a double spiral of CF3-groups from the ligand molecule; the structure is a new uninodal 4-connected net that only exists when bent ligands connect the centres, and the compound exhibits selective sorption and catalytic chiral recognition properties.