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- ItemMethyl 5-chloro-2-hydr-oxy-3-(4-methoxyphenyl)-4,6-dimethylbenzoate(Chester : International Union of Crystallography, 2009) Adeel, M.; Ali, I.; Langer, P.; Villinger, A.In the title compound, C17H17ClO4, the dihedral angle between the mean planes of the two benzene rings is 65.92 (5)°. The methyl ester group lies within the ring plane [deviations of O atoms from the plane = -0.051 (2) and 0.151 (2) Å] due to an intra-molecular O - H⋯O hydrogen bond. In the crystal, molecules are held together by rather weak non-classical inter-molecular C - H⋯O hydrogen bonds, resulting in dimeric units about inversion centers, forming eight- and ten-membered ring systems as R22(8) and R2 2(10) motifs. © Adeel et al. 2009.
- ItemEthyl 4-chloro-2′-fluoro-3-hydroxy-5-methylbiphenyl-2-carboxylate(Chester : International Union of Crystallography, 2011) Adeel, M.; Langer, P.; Villinger, A.In the title compound, C 16H 14ClFO 3, the dihedral angle between the mean planes of the two benzene rings is 71.50 (5)°. Due to an intramolecular O - H⋯O hydrogen bond between the hydroxy group and the carbonyl O atom of the ethyl ester group, the ethyl ester group lies within the ring plane. The crystal structure is consolidated by intermolecular C - H⋯O and C - H⋯F interactions.
- ItemTandem dinucleophilic cyclization of cyclohexane-1,3-diones with pyridinium salts(Frankfurt, M. : Beilstein-Institut zur Förderung der Chemischen Wissenschaften, 2013) Kiamehr, M.; Moghaddam, F.M.; Mkrtchyan, S.; Semeniuchenko, V.; Supe, L.; Villinger, A.; Langer, P.; Laroshenko, V.O.The cyclization of cyclohexane-1,3-diones with various substituted pyridinium salts afforded functionalized 8-oxa-10-aza-tricyclo[7.3.1.0 2,7]trideca-2(7),11-dienes. The reaction proceeds by regioselective attack of the central carbon atom of the 1,3-dicar-bonyl unit to 4-position of the pyridinium salt and subsequent cyclization by base-assisted proton migration and nucleophilic addition of the oxygen atom to the 2-position, as was elucidated by DFT computations. Fairly extensive screening of bases and additives revealed that the presence of potassium cations is essential for formation of the product.
- ItemA neutral low-coordinate heterocyclic bismuth-tin species(Cambridge : Soc., 2015) Hering-Junghans, C.; Schulz, A.; Villinger, A.The reaction of distannadiazane bearing bulky RAr*-groups (RAr* = C6H2{C(H)Ph2}2R-2,6,4; R = iPr, tBu) with ECl3 (E = Sb, Bi) was studied resulting in the isolation of previously unknown N,N-bis(dichloropnictino)amines (3) and a novel heterocyclic carbenoid bismuth species (4) bearing a Bi(III) and a Sn(IV) center. The structure and bonding was investigated by means of X-ray structure elucidations and DFT calculations.
- ItemAn efficient route to 1,3,5-triazido-2,4,6-tricyanobenzene(Berlin : DeGruyter, 2012) Becker, M.; Voss, K.; Villinger, A.; Schulz, A.An efficient synthetic route starting from 1,3,5-trimethylbenzene is described for binary 1,3,5- triazido-2,4,6-tricyanobenzene. Besides 1,3,5-triazido-2,4,6-tricyanobenzene, all intermediates have been isolated and fully characterized.