The synthesis and enantiomeric features of 2-hydroxymethyl-tetrahydro-oxazolo[3,2-c]pyrimidine-5,7-(4H,6H)-diones (V) are. described. The diazomethane methylation of these bicyclic compounds afforded 2-hydroxymethyl-6-methyl-tetrahydro-oxazolo-[3,2-c]pyrimidine-5,7-(4H,6H)-diones (R)-(XXII) and (S)-(XXII), respectively. For the synthesis of (R)-V and (S)-V the respective 5-bromo-1-(2,3-dihydrox...

Incorporation of [3H]orotic acid into low-molecular-weight nRNA of rat liver, fractionated on polyacrylamide gels, increased 6-12h after partial hepatectomy and 6h after gamma-irridation at 2000 R. The incorporation of orotic acid was particularly increased into the 4.5S, 5S and approx. 10S nRNA fractions. If the irradiation was given after 6h of regeneration and RNA was isolated from the nucle...

Raman spectroscopy was applied to different-impurities-doped 6H-SiC crystals. It had been found that the first-order Raman spectra of N-, Aland B-doped 6H-SiC were shifted to higher frequency when comparing with undoped samples. However, the first-order Raman spectra of V-doped sample was shifted to lower frequency, revealing that there existed low free carrier concentration, which might be ind...

Synthesis, identification and thermal behavior studies of nanoparticles cobalt (II) bromide has been studied in this research. Cobalt (II) bromide was synthesized by planetary high-energy ball mill. The general formula of this compound is CoBr2.6H2O. The synthesized nanoparticles were characterized by Fourier transform infrared spectroscopy and also Size and structure of s...

Abstract Perovskite lithium lanthanum titanate (LLTO) was prepared as an inorganic solid electrolyte material for ion batteries applications using sol-gel method. Three different compositions of : (a) 3x=0.3 (Li 0.3 La 0.57 TiO 3 ), (b) 3x=0.5 0.5 ) were and calcined at 1000°C 6h, (c) 3x=0.1 0.1 0.63 1100°C 6h. The effects content calcination temperature on the structure perovskite powders stud...

Recent research efforts in growth of 3C-SiC are reviewed. Sublimation growth is addressed with an emphasis on the enhanced understanding of polytype stability in relation to growth conditions, such as supersaturation and Si/C ratio. It is shown that at low temperature/supersaturation spiral 6H-SiC growth is favored, which prepares the surface for 3C-SiC nucleation. Provided the supersaturation ...

2-(1-(4-Bromophenyl)-2-thiocyanatoethylidene)malononitrile (3) undergoes azo coupling with diazotized aromatic amines to afford arylhydrazone derivatives, which are readily cyclized to afford the corresponding 3(2H)-pyridazinimine derivatives upon reflux in aqueous NaOH. Under similar condition an o-cyanoarylhydrazone derivative was cyclized into 6H-pyridazino[1,6-a]quinazolin-6-imine, which in...