1. Dirhodium tetraacetate catalyzed carbon-hydrogen insertion reaction in N-substituted .alpha.-carbomethoxy-.alpha.-diazoacetanilides and structural analogs. Substituent and conformational effects
2. Crystals of methyl 2,2-dioxo-3-phenyl-2-thia-3-azabicyclo[3.1.0]hexane-1-carboxylate (17a) were grown by slow evaporation of their solution in a CH2Cl2/Et2O/hexane mixture and measured on a Stoe IPDS II two circle diffractometer using graphite-monochromated Mo-Kα radiation. The structure solutions and refinements on F2 were performed with the SHELXL-97 program. The hydrogen atoms were located in difference Fourier maps and refined as riding groups with the 1.2-fold isotropic displacement parameter of the corresponding C atom. 17a: C12H13NO4S (267.29), crystal size: 0.1-0.3 mm, T 133(2) K, monoclinic, a = 10.3899(7), b = 6.0821(3), c = 19.3059(15) Å, α = 90, β = 104.531(6), γ = 90°, V = 1180.96(13) Å3, Z = 4, space group P21/n, ρ = 1.503 g cm-3, μ = 0.280 mm-1, intensities measured: 17057 (2θmax = 49.52°), independent 1982 (Rint = 0.0339), 215 parameters refined, R1 = 0.0279 for 1896 reflections with I > 2σ(I), wR2 (all data) = 0.0691, Gof = 1.076, maximum and minimum residual electron densities 0.347 and -0.294 e Å-3. CCDC-713449 contains the crystallographic data (excluding structure factors). These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
3. Novel Liquid Crystalline Compounds Containing Bicyclo[3.1.0]hexane Core Units
4. The geometry of small rings. I. Substituentinduced bond-length asymmetry in cyclopropane