2,4,6-Tris(4-iodophenoxy)-1,3,5-triazine as a new recyclable “iodoarene” for in situ generation of hypervalent iodine(III) reagent for α-tosyloxylation of enolizable ketones

The synthesis of 2,4,6-tris[(4-iodo)phenoxy)]-1,3,5-triazine 6, as a new recyclable nonpolymeric analogue of iodobenzene is achieved using the reaction of 2,4,6-trichloro-1,3,5-triazine with 4-iodophenol in the presence of KOH. The application of 6 as a recyclable ‘iodoarene’ is demonstrated for α-tosyloxylation of enolizable ketones via in situ generation of hypervalent iodine(III) species using PTSA and MCPBA as the terminal oxidant. The recyclability of the reagent 6 was possible owing to the facile recovery and reuse from the reaction mixture due to its near insolubility in methanol.     

Non-existence of higher dimensional axially symmetric field in Rosen's theory of gravitation

In Rosen's bimetric theory of gravitation the non-existence of higher dimensional axially symmetric massive scalar field and massive complex scalar field coupled with electromagnetic field is established.The authors are thankful to the referee for helpful suggestions.     

Thermodynamic equilibrium of a gravitating sphere in Lyra's geometry

This paper deals with a particular case of Lyra's modification of Riemannian geometry in which the consequences of the thermodynamic equilibrium of a gravitating fluid sphere have been considered. These considerations lead to a zero red shift in this static model.     

On the Maxwell-Boltzmann statistical distribution function of an ideal gaseous assembly in mass motion

The invariance of the Maxwell-Boltzmann statistical distribution function has been established using Hsu’s space-light transformations. The transformations of temperature and heat turn out to be the same as given by Ott, contradicting Planck-Einstein’s views regarding their transformation. Incidently the invariance of entropy is obtained.     

Kinematics of new transformations

By constructing a composite mapping of Voigt and Lorentz transformations some new non relativistic transformations of conformal type are obtained where the laws of Maxwell’s electromagnetic theory are found to be invariant. This new scheme is consistent with some of the well established experimental facts.     

Synthesis of 4-aryl substituted 3,4-dihydropyrimidinones using silica-chloride under solvent free conditions

This paper describes an improved procedure for the efficient and facile synthesis of 4-aryl substituted 3, 4-dihydropyrimidinones under mild reaction conditions with excellent yields using inexpensive silica chloride under solvent free conditions.     

Un-catalyzed tandem Knoevenagel–Michael reaction for the synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) in aqueous medium

An environmentally benign un-catalyzed one-pot synthesis of 4,4′-(arylmethylene)bis(1H-pyrazol-5-ols) has been reported via tandem Knoevenagel–Michael reaction of aldehydes with two equivalents of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one in aqueous medium.     

Electrochemical performance of magnetic nanoparticle-decorated reduced graphene oxide (MRGO) in various aqueous electrolyte solutions

Journal of Solid State Electrochemistry - The objective of this work is twofold: (1) to improve the electrochemical performance of reduced graphene oxide (RGO) by decorating RGO sheets with...     

Convenient synthesis of symmetrical diketosulfides from enolizable ketones using [hydroxy(tosyloxy)iodo]benzene and na2S ⋅ 9H2O

An efficient method for the preparation of symmetrical diketosulfides of the type ArCOCH₂SCH₂COAr has been developed from the reaction of [hydroxy(tosyloxy)iodo]benzene with various acetophenones, followed by treatment with Na₂S ⋅ 9H₂O. © 2009 Wiley Periodicals, Inc. Heteroatom Chem 20:172–176, 2009; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/hc.20524