Current Organic Chemistry - Volume 7, Issue 3, 2003

Fluorescence spectra of molecular guests at several temperatures are useful technique to study several types of polymer properties. In particular, it has been often employed to study polymer relaxation processes either in static or in dynamic conditions. In this work some applications of the steady-state fluorescence spectroscopy of different guests in polyethylene and in particular reports the photophysical behavior of 1,3-di( Read More

Further to a previous contribution to this journal (Kinghorn et al., Curr. Org. Chem. 1998, 2, 597), in the present review we describe a continuation of efforts to obtain novel potential cancer chemopreventive agents from mainly edible plants using selected in vitro bioassays to monitor chromatographic fractionation. Altogether, 52 further active compounds have been isolated from eight plant acquisitions, of which 19 ar Read More

Over the course of the last several decades, a number of strategies have been designed for synthesizing spiroketals stereoselectively. This review looks at selected highlights of these strategies as they relate to recent synthetic efforts directed at natural products. While particular emphasis will be given to some newer strategies and innovations, examples of many of the strategies described herein have been documented in pre Read More

The chemical manifestations of orbital interactions through four σ-bonds in the base-induced and -directed reactions of monosulfonated trans-perhydronaphthalene- and norbornane-1,4-diols are discussed. Through-bond interactions (TBI) and σ-participation are the most important stereoelectronic effects which principally determine their reactivity. Dependent on the geometry of the relaying C-C bonds, these compo Read More

The aromatic metalation - cyclization sequence is a valuable protocol for the regiospecific construction of carbocyclic and heterocyclic systems. Aromatic lithiation can be carried out by lithium - hydrogen or lithium - halogen exchange. The latter procedure, though mechanistically controversial, is the method of choice to introduce specifically a lithium atom into a given, non-activated position of the aromatic ring. O Read More