Tobacco Chemistry. 46. Syntheses of (12R,13S)- and (12S,13R)-8,12-Epoxy-14-labden-13-ol and (12S,13R)-8,13-Epoxy-14-labden-12-ol, Three Tobacco Diterpenoids.

A New Configurational Analysis of 1,6,7-triacetoxy-8,13-epoxy-14-labden- 11-one Isolated from Plectranthus ornatus Based on NMR and Theoretical Calculations

This work describes the configurational and conformational analyses of 1,6,7-triacetoxy-8,13-epoxy-14-labden11-one, a labdane diterpenoid isolated from Plectranthus ornatus. Its relative stereochemistry was previously proposed by comparison with H and C NMR data of forskolin (2); however, the configurations of C-8 and C-13 have not been confirmed. Correlations between C NMR experimental data an...

New Clerodane Diterpenes from Fungal Biotransformation of the 3,12-Dioxo-15,16-Epoxy-4-Hydroxycleroda-13(16),14-Diene

Terpenes, with approximately 30,000 compounds, are considered one of the most important classes of natural products isolated from plants. They have high economic value and have applications in several areas such as pharmaceutical and cosmetic industries. Among the terpenes, diterpenes are notable by exhibiting anti-microbial, insecticidal, anti-carcinogenic, anti-diabetic and neurobiological ac...

Curing of Epoxy Resins with 1 - [ Di ( 2 - Chloroethoxyphosphinyl ) methyl ] - 2 , 14 - and - 2 , 6 - Diamiilobenzene

(11R,12S)-16-Amino­tetra­cyclo­[6.6.2.02,7.09,14]hexa­deca-2(7),3,5,9(14),10,12-hexaen-15-ol

In the title compound, C(16)H(15)NO, the dihedral angle between the outer benzene rings is 51.88 (6)°, and each of the central six-membered rings has a boat conformation. The hy-droxy and amino groups are syn, and the hy-droxy H atom forms an intra-molecular O-H⋯N hydrogen bond. In the crystal, mol-ecules assemble via C-H⋯O and C-H⋯π inter-actions, consolidating a three-dimensional architecture.

Properties of Epoxy/SiO2 - and Epoxy/ZrO2 - Nanocomposites

The synthesis, structure and mechanical properties of inorganic organic nanocomposites are investigated: The systems consist of an aliphatic amine cured Bisphenol-F-based epoxy resin as organic matrix and SiO2 and ZrO2 nanoparticles as inorganic fillers. Silica and zirconia nanoparticles have been prepared in two different size ranges, one in the upper nano range (30-60 nm) and other in the low...