The microwave synthesis of quinoline alkaloid 4-methoxyquinolin-2(1H)-one 3a and its analogues 3b-e was achieved in 8-11 minutes by methoxydechlorinated of 4-chloroquinolin-2(1H)ones 2a-e using TBAB as phase transfer catalyst. The starting compound obtained by selective decholorination of 1a-e by sodium acetate/acetic acid and the structure of synthesized compound has been established by IR, 1H...

The title compound, C(17)H(13)N(3)OS, was obtained by the reaction of benzoyl chloride, ammonium thio-cyanate and 5-amino-quinoline in the presence of polyethyl-eneglycol-400 (PEG-400) as a phase-transfer catalyst. The compound crystallized as discrete mol-ecules linked by N-H⋯N and C-H⋯N hydrogen bonds involving all the potential donors, generating sheets parallel to (100). An intramolecular N...

An enantioselective Biginelli reaction has been developed by using a bifunctional primary amine-thiourea-TfOH (BPAT·TfOH) as a chiral phase-transfer catalyst and t-BuNH(2)·TFA as an additive in saturated brine at room temperature. The corresponding dihydropyrimidines were obtained in moderate-to-good yields with up to 99% ee under mild conditions. A plausible transition state has been proposed ...

The synthesis of the azoxybenzenes by the reduction of nitroarenes with reducing agent potassium borohydride in water was reported for the first time. PEG-400 was used as a phase transfer catalyst and could effectively catalyze the reduction. The electronic effects of substituent groups play an important role in determining the reduction efficiencies. Electron-withdrawing substituents promote t...

background: there is no doubt that luteal phase support is essential to enhance the reproductive outcome in ivf cycles. in addition to progesterone and human chorionic gonadotropin, several studies have described gnrh agonists as luteal phase support to improve implantation rate, pregnancy rate and live birth rate, whereas other studies showed dissimilar conclusions. all of these studies have b...

in this paper, the problem of turbulent forced convection flow of water- alumina nanofluid in a uniformly heated pipe has been thoroughly investigated. in numerical study, single and two-phase models have been used. in single-phase modeling of nanofluid, thermal and flow properties of nanofluid have been considered to be dependent on temperature and volume fraction. effects of volume fraction a...

heat transfer phenomena in batch fluidized bed dryer have been studied and analyzed using three phase model including solid phase, interstitial gas phase and bubble phase based on rizzi model. new correlations of heat transfer coefficient to surrounding and convection heat transfer coefficient between solid and interstitial gas are being proposed. in addition, some modifications have been done ...

Size separation of silver nanoparticles was investigated in counter-current chromatography (CCC) based on a unique step-gradient extraction process. Carboxylate anions were modified on silver nanoparticles to produce water-dispersible nanoparticles. The aqueous nanoparticles were readily transferred to the organic phase (toluene/hexane = 1:1, v/v) together with the phase transfer catalyst, tetr...