Foad Mustafa Mahmoud

Foad Mustafa Mahmoud
An-Najah National University · Department of Chemistry

PhD

About

19
Publications
412
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153
Citations
Additional affiliations
October 1981 - October 2015
An-Najah National University
Position
  • Professor (Associate)

Publications

Publications (19)
Article
Aromatic and heteroaromatic N-methyl-N-(2-pyridyl)- hydrazones 3a-f were synthesized and characterized by elemental analyses and spectral data. 1H, 13C NMR and mass spectra supported the formation of the E-isomer. N-Methyl- N-(2-pyridyl)hydrazone carboxaldehydes can be readily characterized by mass spectrometry. The new hydrazones 3a-h have been sc...
Article
Aromatic and heteroaromatic N-methyl-N-(2-pyridyl)-hydrazones 3a-f were synthesized and characterized by elemental analyses and spectral data. 1 H, 13 C NMR and mass spectra supported the formation of the E-isomer. N-Methyl-N-(2-pyridyl)hydrazone carboxaldehydes can be readily characterized by mass spectrometry. The new hydrazones 3a-h have been sc...
Article
Full-text available
The rates of cleavage of p-chlorotrimethylsilane were measured in various ROH-DMSO media (R: Me, Et, i-Pr, t-Bu, CF<SUB>3</SUB>CH<SUB>2 </SUB>-<SUB>, </SUB>HOCH<SUB>2</SUB>CH<SUB>2</SUB>-) and the results were reported. These results have shown that the rates of cleavage decrease as the mole ratio of ROH increases.
Article
Full-text available
The nucleophilic cleavage of substituted benzyltrimethyl-silanes in DMSO-H<sub>2</sub>O media using tetraalkylammonium fluoride, TAAF, has been studied. The observed rate constants, pseudo first order rate constants, activation, and thermodynamic parameters have been reported. A mechanism for such cleavage has been proposed. The results fit well Ha...
Article
A method for simultaneous spectrophotometric determination of total iron, iron(II) and iron(III) in mixtures containing other metal ions has been described. The method is based on the complexation of iron with di-2-pyridyl ketone benzoylhydrazone (DPKBH) in 50% (v/v) ethanolic solution. Iron(II) complex with DPKBH exhibits two absorption maxima at...
Article
Full-text available
The hydrolysis of furfurylidene benzoylhydrazone,FBH, in hydrochloric acid medium has been found to follow specific acid catalysis, whereas the hydrolysis in universal buffer medium has been found to follow general acid-base catalysis. Mechanisms for the hydrolysis in different acidic media have been postulated. The observed rate constants, seconda...
Article
The kinetics and mechanism of hydrolysis of a series of substituted benzylidene benzoylhydrazones (X-BBH) have been studied at five different temperatures in the range 25-45 C by UV-Visible spectrophotometry. The hydrolysis reactions were found to follow 1st order kinetics. A mechanism has been postulated in which attack of water on the protonated...
Article
A method for spectrophotometric determination of palladium by complexation with Arylidene-2-pyridylhydrazone derivatives in 50% (V/V) ethanolic solution are described-Pd(II) forms a 1:1 complex with the reagents. Beer's law is obeyed over the range 0.2-6.5 μg ml−1. The effect of pH, effect of excess reagent, stability of complexes as well as the to...
Article
The highly sterically-hindered organosilicon iodide (Me3Si)3CSiMe2I undergoes solvolysis in MeOH by an SN1 process; the half-life is approximately 13 days at 50°C, and the reaction is little accelerated by the presence of NaOMe, which does, however, induce a competing fragmentation.
Article
The rates of gas-phase pyrolysis of β-substituted ethyl acetates AcOCH2CH2X where X = SiMe3, SiEt3, GeEt3, and SiMe2Ph, and of 1-aryl-2-trimethylsilylethyl acetates have each been measured over a minimum of 50 °C, between 282 and 397 °C; the rates of pyrolysis of 2-aryldimethylsilylethyl acetates have been measured at 396.9 and 378.2 °C. The β-orga...
Article
Kinetic studies have been made of the solvolysis (mainly the methanolysis) of the highly sterically hindered compounds TsiSiMe2OClO3[Tsi =(Me3Si)3C], (Me3Si)2(Ph2MeSi)CSiMe2OClO3, TsiSiHPhX (X = I, Br, ONO2), and TsiSiHMel. The rate of methanolysis of TsiSiMe2OClO3 is increased by only ca. 20% upon addition of 0.1MNaOMe, and further additions of ba...
Article
The amine (Me3Si)3CSiMe2NH2 has been made by treatment of (Me3Si)3CSiMe2OClO3 with liquid ammonia. It is recovered unchanged from its solutions in methanol containing acid or base or in trifluoroacetic acid, and is unaffected by various diazotizing agents.The hydrochloride (Me3Si)3CSiMe2NH3Cl has a pKa of 4.1 in ca. 42/58 v/v H2O/THF at 20°C.
Article
The compounds PhCH2SiMe2(CH2)nOH with n = 2 or 3 arecleaved 0.75 and 95135 times, respectively, as readily as PhCH2SiMe3 by NaOMe/MeOH at 500C. The high reactivity of the compound with n = 3 may arise from intramolecular attack of the alkoxide centre on silicon in the anion PhCH2SiMe2(CH2)3O-.
Article
The effects on the rates of cleavage of 3-ClC6H4CH2MMe3 and 3,5-Cl2C6H3CH2MMe3 compounds with M = Si and Sn have been examined for (a) various concentrations of NaOMe-MeOH; (b) various concentrations of H2O in NaOHH2O-eOH; and (c) variation of R from Me to Et, i-Pr and t-Bu for metal alkoxide-ROH mixtures. Rates have also been measured for cleavage...
Article
The compounds R3SiGePh3 with R = Me or Et have been shown to undergo cleavage in NaOMe-MeOH to give Ph3GeH. From rate measurements and solvent isotope effect studies it is concluded that the Ph3Ge− anion separates in the rate-determining transition state. There is an unusually large steric effect, Me3SiGePh3 being roughly 1300 times as reactive as...
Article
Methanolysis of (Me3Si)3CSiPhHI is not significantly accelerated by NaOMe, and so is thought to involve rate-determining ionization of the iodide.
Article
Kinetic studies have been carried out on the reaction of the perchlorate (Me3Si)3CSiMe2OClO3 with anhydrous methanol. The effects of added NaOMe, LiCl, LiNO3, and NaClO, are consistent with rate-determining ionization of the perchlorate.

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