Pyrene picrate

Cleavage of hydrocarbon pierates. Picrates of dimethyinaphthalenes are usually cleaved by absorption of the picrate on a column of basic alumina and elution of the hydrocarbon with benzene. Eisenbraun et al. report that petroleum ether dissolves the arene but essentially no picric acid the method reduces the amount of solvent and alumina required. In addition the picric acid can be recovered for reuse. The method is less suitable for picrates of more complex arenes which are not readily cleaved (fluoranthene picrate and pyrene picrate). 

Several encapsulation experiments with suitably sized guests such as adaman-tane, 1,2,4,5-tetramethylbenzene, anthracene, pyrene, sodium picrate, and fuller-enes in various solvents were carried out. The complexation experiments, monitored by 1H NMR, were performed at room temperature by forming capsule 32f in the presence of excess guest. The only successful encapsulation experiment performed was the one using methano[60]fullerene derivatives bearing dimethyl and diethyl malonate addends. Evidence for inclusion complexation, provided by 1H NMR, was confirmed by ESI-MS investigations, which showed the formation of 1 1... 

In the recent past liquid membranes were employed for the separation and extraction of materials, and they can be conveniently employed for separating biological materials [129-137], Microemulsions of Winsor I (o/w) and Winsor II (w/o) types are considered dispersed liquid membranes that can augment the transfer of oil-soluble and water-soluble compounds, respectively, across them by trapping them in microdroplets for convenient uptake and subsequent release. The microemulsions (Winsor I and II) are called bulk liquid membranes. They are recent additions in the field of separation science and technology. This field has been fundamentally explored and advanced by Tondre and coworkers [138-147], who worked out the fundamentals of the transport process by studying the transfer of alkali metal picrates and other compounds across the w/o microemulsions [140-142], They also studied the transport of lipophilic compounds (pyrene, perylene, and anthracene) across o/w liquid membranes [138,139],... 

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