In the crystal structure of the title compound, C(32)H(34)O(6), the mol-ecule is located on a twofold rotation axis. The two naphthyl fused-ring systems are aligned at 72.6 (1)°. Weak intermolecular C-H⋯O hydrogen bonding is present in the crystal structure.

Treatment of aryl-fused bicyclo[4.2.0]octanols with an oxidant such as phenyliodine diacetate (PIDA) or hypochlorous acid gave dihydrofuran-containing polycyclic aromatic compounds by selective β-cleavage the cyclobutanol moiety. Mechanistic studies suggest that oxygen atom hydrofuran ring is incorporated from hydroxy group substrate via intramolecular addition. The oxidative transformation sho...

This study was conducted to assess the effects of 0.5% Preservative Mixture (PM) containing calcium lactate (40%), sodium diacetate (40%) and sodium chloride (20%) on the microbiological, chemical and sensory quality of chicken meat nuggets stored at 4±2 C and under Modified Atmosphere Packaging o (MAP). There were two experimental groups of samples, namely control and PM-treated. The results s...

In the title compound, C(33)H(36)O(6), two naphthalene ring systems are connected through a methyl-ene linkage [C-C-C = 114.9 (2)°]; the ring systems are aligned at an angle of 76.5 (1)°. Of the two -O-CH(2)-C(=O)-C(CH(3))(3) substituents, one adopts an extended conformation whereas the other is U-shaped. In the crystal, mol-ecules are linked via weak C-H⋯O hydrogen bonding, forming supra-molec...

Our objective was to study the properties of the carboxyfluorescein diacetate succinimidyl ester (CFDA-SE) and the methodology of cell labeling using CFDA-SE fluorescent dye. First, we analyzed the kinetics of CFDA-SE fluorescent dye intensity over time. Second, we determined the optimal concentration of CFDA-SE fluorescent dye for cell labeling. Third, we tested the toxicity of CFDA-SE fluores...

The title compound, C(24)H(30)O(6), does not exhibit π-π inter-actions due to the steric effect of the bulky tert-butyl groups present in the mol-ecule. The presence of these groups at the 2 and 2' positions hinders the free motion of the benzene rings relative to each other, causing them to adopt an anti-periplanar arrangement. The benzene rings are twisted by just under 50.96 (17)° with respe...

In the title compound, C(14)H(27)NO(5), the hydr-oxy group and one of the acetate carbonyl O atoms are linked by an intra-molecular O-H⋯O hydrogen bond, forming an eight-membered ring. This inter-action gives rise to an asymmetric mol-ecular conformation.

We have demonstrated that intracellular nitric oxide (NO) can be detected and measured directly in human spermatozoa by flow cytometry using the fluorescent probe 4,5-diaminofluorescein-2/diacetate (10 microM). This method can measure both exogenously added as well as endogenously generated intracellular NO.

Sir: The structure of the first l8-membered lactone, borrelidin, was described in 1967 by KELLERSCHIERLEIN1). In recent years, four more antibiotics have been added to this class. Concanamycins A, B and C2.3), produced by Streptomyces diastatochromogenes S45, inhibit the proliferation of mouse splenic lymphocytes stimulated by concanavalin A. The fourth antibiotic, virustomycin A4,5) also produ...

Oxidative cyclization of 6-chloro-4-pyrimidinylhydrazones 4 with iodobenzene diacetate (IBD) in dichloromethane gives rise to [1,2,4]triazolo[4,3-c]pyrimidine derivatives 5a-o. These incipient products undergo feasible Dimroth rearrangement to furnish the isolated [1,2,4]triazolo[1,5-c]pyrimidines 6a-o in moderate to high yields.