66 research outputs found
ChemInform Abstract: SUBSTITUENTENEFFEKT AUF DIE PYRAMIDALE INVERSION VON 1-ARYL-2,2-DIMETHYL-AZIRIDINEN
Structures cristallines et moléculaires des muscs macrocycliques III. La muscone et sa 2,4-dinitrophénylhydrazone
Muscone (3-methylcyclopentadecanone C16H30O) forms orthorhombic plastic-crystals with Z = 2 (a = 5.560(4), b = 8.176(6), c = 17,168(20) Å). Single crystals are obtained by zone melting at 258 °K. The high degree of disorder and the ambiguity of space group have precluded a structural determination by X-ray diffraction methods.
The crystal structure of muscone 2,4-dinitrophenylhydrazone (DNPHM; C22H34N4O4, triclinic, space group P¯, a = 8.015 (4), b = 8.235 (2), c = 17.409 (4) Å. α = 102.69 (4), β; = 93.86 (3), γ = 96.03 (3)° Z = 2) was solved by direct methods and refined to a final R of 0.155 (Rω = 0.102). The macrocycle shows static disorder, which could be partially resolved by analysis of the anisotropy of the atomic vibrational parameters. Eight possible conformers with reasonable geometries emerged from the subsequent refinements and were used as starting models in force-field calculations, which converged to four quinquangular conformations ([25233]; [34233]; [21423*4]; [3423*4]) with similar energies. In the molecular packing, the interactions between macrocycles and substituents are minimized. They are comparable to those described for the cis- and trans-civetone DNPH derivatives [1] [2].</p
Übergangsmetallkomplexe der Liganden PhAsH2 und Ph2As2H2; Struktur und Epimerisierung vonmeso-Ph2As2H2[Mn(CO)2C5H5]2
Effect of substituents on the rate of pyramidal inversion of 1-aryl-2,2-dimethylaziridines
2,2′-Diindolylmethane. VI (1). NMR-spektroskopische untersuchungen an chiralen und achiralen 2,2′-diindolylmethanen mit tryptophanester-strukturelement
The dynamic stereochemistry of dimesityl-2,4,6-trimethoxyphenylmethane: A1H NMR study at 270 MHz
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