Aţ Ţafīlah, Tafilah, Jordan

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    ABSTRACT: A series of mono- and disubstituted O-ferrocenoyl conjugates of 3-trans- and 4-trans-hydroxy-L-proline amino acids are synthesized. These conjugates are protected by tert-butloxycarbonyl (Boc) group at the N-terminus. The Boc removal of the ferrocene (Fc) hydroxy-L-proline conjugates affords a series of mono- and disubstituted Fc conjugates containing free amine at the N-terminus. These conjugates are characterized by NMR and IR spectroscopies as well as mass (MS) spectrometry. The catalytic properties of the free amine Fc conjugates toward aldol addition reaction are studied. The enantioselectivity of the aldol reaction products in acetone solvent is determined by the position of the N-atom in the proline residue with respect to the proline point of attachment to the Fc scaffold. The 4-trans-hydroxy-L-proline containing Fc catalyst favors the production of the R-isomer, while Fc catalysts containing 3-trans-hydroxy-L-proline favors the production of the S-isomer.
    No preview · Article · Aug 2014 · Inorganica Chimica Acta
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    ABSTRACT: β-Pinene–ozone reaction without a scavenger was performed for the first time, in the static bag atmospheric pressure reactor coupled into ion trap mass spectrometer. The diffusion coefficients and evolution times (t10–90%) of multiple fragments were used to characterize their neutral parent ions. Mainly identified products (yields in parentheses) of the reaction such as nopinone (0.58 ± 0.05), formaldehyde (0.19 ± 0.05), HCOOH, CH3COOH, and acetone were successfully associated with their fragment ions. While, 3-hydroxy-nopinone and cis-pinic acid were unsuccessfully associated with their fragments because of the lack of available standard reference mass spectra of these compounds for comparison. Meanwhile, two short-lived intermediates were detected with tentative contributions of products of masses 70 and 97.
    No preview · Article · Nov 2012 · Arabian Journal of Chemistry
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    ABSTRACT: This article examines the relationship between some components (i.e. risk assessment, control environment and control activities) of internal control system and the effectiveness of audit program in Jordan. Based on 43 usable questionnaires, the results of the study show that the risk assessment does contribute significantly toward an effective audit program. On the other hand, the results of analysis indicate that control environment and control activities do not contribute significantly toward an effective audit program. These results give an indicator that Jordanian companies lack the necessary experience to deal with the current tools of internal control evaluation. Some applications and recommendations were suggested for both management of companies and external auditors.
    Preview · Article · Jul 2012 · International Business Research


  • Address
    Aţ Ţafīlah, Tafilah, Jordan
  • Head of Institution
    Prof. Dr. Shtaiwi al-Abdullah
  • Website
  • Phone
    +962- 32250326
  • Fax
    +962- 32250002
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Top publications last week by reads

Energy Conversion and Management 08/2010; 51(8):1708-1713. DOI:10.1016/j.enconman.2009.11.044
10 Reads
Enzyme and Microbial Technology 09/2006; 39(5-39):1030-1035. DOI:10.1016/j.enzmictec.2006.02.007
7 Reads

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