High-resolution chemostratigraphy reveals an episode of enrichment of the redox-sensitive transition metals molybdenum and rhenium in the late Archean Mount McRae Shale in Western Australia. Correlations with organic carbon indicate that these metals were derived from contemporaneous seawater. Rhenium/osmium geochronology demonstrates that the enrichment is a primary sedimentary feature dating ...

A hydroxyl group-directed, highly regio- and stereoselective transposition of allylic alcohols based on rhenium catalysis has been developed. The method is suitable for a direct isomerization of acetals into the thermodynamically preferred isomer as long as one of the hydroxyl groups is allylic. This method will expand the scope of rhenium-catalyzed alcohol transpositions for complex molecule s...

The exceptional versatility of the 1,2,3-triazole ring in tridentate carbonyl rhenium complexes has been explored starting from a "click chemistry" unexpected product obtained from the spontaneous copper to rhenium transmetalation, which opens the way to successive transformation to C-triazolyl and triazolylidene mesoionic carbene.

Preliminary studies of the effects of rhenium salts on plants were initiated by the junior author at Harvard University during 1946 and 1947 under the direction of Professor K. V. Thimann. The interest in this metal was stimulated by his results in an earlier proj ect testing physiological effects of various unusual elements for which such data were not as yet available. In this project, which ...

We have studied experimentally within the pH range of 3.65-5.5 at 50 degrees C the hydrolysis of cellobiose with Novozym 188, a commercial product with high beta-1,4-glucosidase activity derived from Aspergillus niger. We used wide variations in the conversion to be able to apply the integral method and thus determine that there is substrate and mixed product inhibition. Whether the SES triple ...

Multiple possibilities for the coordination of fac-[Re(CO)3(H2O)3]+ to a protein have been determined and include binding to Asp, Glu, Arg and His amino-acid residues as well as to the C-terminal carboxylate in the vicinity of Leu and Pro. The large number of rhenium metal complex binding sites that have been identified on specific residues thereby allow increased target identification for the ...

Convenient methods to prepare solvated rhenium oxochlorides are described; these compounds should serve as useful starting materials for rhenium chemistry. Treatment of perrhenic acid, HReO(4), with chlorotrimethylsilane or with thionyl chloride, followed by addition of tetrahydrofuran, forms the new oxochloride complexes ReO(3)Cl(THF)(2) and ReOCl(4)(THF), respectively. Small amounts of two di...

The relevance of the article does not raise any doubts, especially in context modern consumption rhenium. Rhenium is an industrial metal that has gained increasing recognition and widely used only Russia but also foreign countries, mainly form alloys with other elements, imparting special physicochemical properties to based on wolfram molybdenum. most popular addition molybdenum tungsten are re...

BACKGROUND Re(I) tricarbonyl complexes exhibit immense potential as fluorescence imaging agents. However, only a handful of rhenium complexes have been utilized in biological imaging. The present study describes the synthesis of four novel rhenium complexes, their characterization and preliminary biological studies to assess their potential as biological imaging agents. RESULTS Four facial rh...