Benzamidinium tetra­hydro­penta­borate sesquihydrate

The asymmetric unit of the title compound [systematic name: benzamidinium 3,3′,5,5′-tetra­hydr­oxy-1,1′-spirobi[2,4,6-trioxa-1,3,5-triboracyclo­hexa­ne](1−) sesquihydrate], C7H9N2 +·B5H4O10 −·1.5H2O, is composed of two protonated benzamidinium cations, two tetra­hydro­penta­borate anions and three water mol­ecules of crystallization. The ions and water molecules are associated in the crystal structure by an extensive three-dimensional hydrogen-bonding network, which consists mainly of cation-to-anion N—H⋯O and anion-to-anion O—H⋯O hydrogen bonds

(1S*,3R*,5S*,7S*)-4,4,8,8-Tetrachloro-1-isopropyl-5-methyltricyclo[5.1.0.03,5]octane

The title compound, C12H16Cl4, is a derivative of the natural product 1-isopropyl-4-methylcyclohexa-1,4-diene, and represents a diastereomer with two trans-fused cyclopropane rings. Both enantiomers are present in the non-centrosymmetric polar space group Pna21. The central cyclohexane ring is planar within 0.02 (1) Å. The C atoms of dichloromethylene groups deviate from this plane by 1.19 (1) and −1.26 (1) Å, whereas the isopropyl and methyl groups are oriented more equatorially, deviating by 0.71 (1) and −0.87 (1) Å, respectively

Synthesis and structures of 2,3,6-triaryl-1-acyl-4-acyloxypiperideines

1-Acyl-4-acyloxy-2,3,6-triaryl-δ3- and δ4-piperideines were obtained by acylation of 2,3,6-triarylpiperidone and its 1-acetyl derivative with carboxylic anhydrides and chlorides. The molecular and crystal structures of 3-phenyl-2,6-bis(o-acetoxyphenyl)-1-acetyl-4-acetoxypiperidin-3-ene were established by x-ray diffraction analysis. © 1991 Plenum Publishing Corporation

Crystal and Molecular Structure of 2-Acetyl-5-Methyl-3- Phenylfuran

The molecular structure of the title compound indicates that it possesses a transoid structure of the O=C-C-O group, and a dihedral angle of about 40° between the furan and phenyl rings. The same conformation is predominant also in CDCl3 solution as indicated by europium chelate induced proton shifts. The corresponding 2,4-dinitrophenyhydrazone has, however, the cisoid isomer stabilized by an intramolecular hydrogen bond