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1.
The reaction of different mercapto substituted heterocycles with o,o-dialkyl chlorphosphate or thiophosphates, gave the corresponding S- and N- alkylated derivatives instead of the expected phosphorylated products. 相似文献
2.
A probable biogenetic type synthesis of coumestans by coupling in-situ generated o-quinones by mushroom tyrosinase oxidation of catechol and 4-hydroxy coumarins is reported. 相似文献
3.
Trialkyl acyl ammonium halides have found to be superior phase transfer catalysts. They were easy to prepare and afford the reactions to be carried out at elevated temperature, owing to their stability. 相似文献
4.
The synthesis of the title pheromones involves solvomer-curation of an olefin and reductive carbon-carbon bond formation with α,β-unsaturated carbonyl compounds to give the key intermediates 3(a & b), which by simple conventional methods offered (1) & (2). 相似文献
5.
6.
CM Thaker S Rayaprol Krushna Mavani DS Rana MS Sahasrabudhe SI Patil DG Kuberkar 《Pramana》2002,58(5-6):1035-1039
The effect of simultaneous substitution of a fluctuating cation and a divalent cation in LaMnO3 perovskite modifies the properties of the material to exhibit large valence colossal magnetoresistance (CMR) effect. A good
example of these properties is (La1−2x
Pr
x
Ca
x
)MnO3 (LPCMO) type CMR material. In this communication it is reported that, with the increase in x (for x=0.1, 0.15, 0.2), the T
c varies between 100 and 120 K with improvisation in metal-insulator transition. Interestingly, resistance increases with x from few hundred ohms to few kilo ohms with corresponding decrease in the unit cell volume. The results of the studies using
X-ray diffraction (XRD), electrical resistivity, magnetoresistance and ac susceptibility measurements on LPCMO samples for
understanding the structural, transport and magnetic properties are discussed in detail. 相似文献
7.
Cycloalkanone hydrazones undergo condensation with mercaptoacetic acid to give predominantly the spirothiazolidinones. The structures of the products have been established on the basis of physico-chemical data. These compounds have shown promising antibacterial and antifungal activity. 相似文献
8.
9.
Rajeev S. Bhalerao 《Pramana》2010,75(2):247-257
It is by now well known that the relativistic heavy-ion collisions at RHIC, BNL have produced a strongly interacting fluid
with remarkable properties, among them the lowest ever observed ratio of the coefficient of shear viscosity to entropy density.
Arguments based on ideas from the string theory, in particular the AdS/CFT correspondence, led to the conjecture — now known
to be violated — that there is an absolute lower limit 1/4π on the value of this ratio. Causal viscous hydrodynamics calculations together with the RHIC data have put an upper limit
on this ratio, a small multiple of 1/4π, in the relevant temperature regime. Less well-determined is the ratio of the coefficient of bulk viscosity to entropy density.
These transport coefficients have also been studied non-perturbatively in the lattice QCD framework, and perturbatively in
the limit of high-temperature QCD. Another interesting transport coefficient is the coefficient of diffusion which is also
being studied in this context. In this paper some of these recent developments are reviewed and then the opportunities presented
by the anticipated LHC data are discussed, for the general nuclear physics audience. 相似文献
10.
Pravin C. Patil Dinesh S. Bhalerao Prasad S. Dangate Krishnacharya G. Akamanchi 《Tetrahedron letters》2009,50(42):5820-5822
Thioamides undergo oxidative dimerization on treatment with hypervalent iodine(V)-containing reagents, particularly o-iodoxybenzoic acid (IBX), in the presence of tetraethylammonium bromide (TEAB) to generate 3,5-disubstituted 1,2,4-thiadiazoles in excellent yield. 相似文献