Catalytic halogenation of selected organic compounds mimicking vanadate-dependent marine metalloenzymes
作者:Chimmanamada U. Dinesh、Rajiv Kumar、Bipin Pandey、Pradeep Kumar
DOI:10.1039/c39950000611
日期:——
The ammonium metavanadate, mimicking vanadate-dependent metalloenzymes, efficiently catalyses the halogenation of a variety of organic substrates in dilute conditions in moderate to good yields using dilute hydrogen peroxide (30%) as an oxidizing agent exhibiting remarkable ortho selectivity with electron-rich aromatics.
simple, efficient and mild method for the selective bromination of activated aromaticcompounds using ammonium bromide as the source of bromine and Oxone® as the oxidant in methanol or water as solvent is reported. The reaction proceeds at ambient temperature in yields ranging from moderate to excellent without a catalyst. bromination - aromaticcompounds - ammonium bromide - Oxone® - selectivity
First example of an ice-like water hexamer boat tape structure in a supramolecular organic host
作者:Binoy K. Saha、Ashwini Nangia
DOI:10.1039/b600348f
日期:——
A T6(2) tape of hydrogen bonded water molecules in boat cyclohexane conformation resides in the channel structure of a dibromophloroglucinol (DBPG) host; water escapes at 40-90 degrees C but is readily re-absorbed by the sponge-like apohost.