@article { author = {Firouzabadi, Habib and Khayat, Zohreh and Sardarian, Ali Reza and Tangestaninejad, Shahram}, title = {Methalloporphirins Catalyze Regio and Chemoselective Silylation of Hydroxy Groups with Hexamethyldisilazane (HMDS)}, journal = {Iranian Journal of Chemistry and Chemical Engineering}, volume = {15}, number = {2}, pages = {54-56}, year = {1996}, publisher = {Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR}, issn = {1021-9986}, eissn = {}, doi = {10.30492/ijcce.1996.10431}, abstract = {Metalloporphirins; Cu(TPP), Mn(TPP)Cl, CO(TPP), Fe(TPP)Cl, zn(TPP) and Mn(OBP)Cl catalyze region and chemoselective silylation of hydroxyl groups with HMDS. Fe(TPP)Cl is the most effective catalyst and silylation occurs immediately in its presence at room temperature.}, keywords = {Metalloporphirin,Silylation,Catalysis,Hydroxy groups. Protection,Regio and Chemoselective,Hexamethyldisilazane}, url = {https://ijcce.ac.ir/article_10431.html}, eprint = {https://ijcce.ac.ir/article_10431_b39f4095ca84e6612982551f5e69959a.pdf} } @article { author = {Tamami, Bahman and Goudarzian, Moredin}, title = {Polymer Supported Zinc Borohydride: A Stable, Efficient, Selective, and Regenerable Reducing Agent for Variety of Organic Compounds}, journal = {Iranian Journal of Chemistry and Chemical Engineering}, volume = {15}, number = {2}, pages = {63-71}, year = {1996}, publisher = {Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR}, issn = {1021-9986}, eissn = {}, doi = {10.30492/ijcce.1996.10433}, abstract = {The difficult to handle and store zinc borohydride, Zn(BH4)2, is stabilized by supporting it on polyvinylpyridine. This new mild, efficient, selective, and regenerable polymer supported borohydride reducing agent reduces a variety organic compounds such as, aldehydes, a-b-unsaturated carbonyl compounds, acid chlorides, epoxides, disulfides, as well as reductive acetylation of carbonyl compounds. It absolutely discriminates aldehydes from ketones.  }, keywords = {Reduction,polymer supported,Reducing agent,Zinc borohydride}, url = {https://ijcce.ac.ir/article_10433.html}, eprint = {https://ijcce.ac.ir/article_10433_baf38cc59ac56047830ea5d9aa5b3025.pdf} } @article { author = {Shahrisa, Aziz and Hemmati, Salar}, title = {Synthesis of Some New Enaminoketones, Analogous of Milrinone, 4,Pyrones and Related 4-Pyridones}, journal = {Iranian Journal of Chemistry and Chemical Engineering}, volume = {15}, number = {2}, pages = {76-80}, year = {1996}, publisher = {Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR}, issn = {1021-9986}, eissn = {}, doi = {10.30492/ijcce.1996.10435}, abstract = {Synthesis of 4-(N,N- dimethylamino)-3-aryl-3-butene-2-one, ethyl-5-aryl-4-oxo-4H-pyran-2-carboxylate, ethyl-5-aryl-4-pyridones-2-carboxylate and 5-aryl-3-cyano-5-methyl-2-pyridones (aryl=3-thienyl, 2-furyl) are described.}, keywords = {4-(N,N-dimethylamino)-3-butene-2-one,4-oxo-4H-pyran,4-pyridone,2-pyridone}, url = {https://ijcce.ac.ir/article_10435.html}, eprint = {https://ijcce.ac.ir/article_10435_1e9742bebb9c327647db408b99908e7c.pdf} } @article { author = {Salehi, Hamed and Eslami, Mozaffar and Sarbolouki, Mohammad Nabi}, title = {Probing the Cure and Postcure Reactions in Polyurethanes by FTIR and GPC}, journal = {Iranian Journal of Chemistry and Chemical Engineering}, volume = {15}, number = {2}, pages = {87-92}, year = {1996}, publisher = {Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR}, issn = {1021-9986}, eissn = {}, doi = {10.30492/ijcce.1996.10437}, abstract = {Fourier transform infrared (FTIR) and gel permeation chromatography (GPC) wre respectively utilized in determining the changes in isocyanate (NCO) concentration and molecular weight (MW) and its distribution (MWD) in polyurethanes during their cure and postcure stages. Samples, originally cured at 45°C, were taken through accelerate aging tests at various temperatures. The FTIR and GPC analytical conditions were optimized, for both molecular weight and molecular weight distribution and NCO group determination. In FTIR spectroscopy Beer's law was obeyed over the ranges: 2.33-22.34 and 0.03-1.61 mmol lit-1. RSD, detection limit and molar absortivity were found to be 1.46%, 4´10-6 mol lit-1 and 1095 lit mol-1 cm-1 respectively. It was found the NCO concentration decreases with the progress of polymerization and at the same time MW of the sol increases, going through a maximum and then decreases to a constant level. The time to reach this level and termination of NCO concentration, i.e., the end of polymerization decreases with the increase in temperature. The results obtained from GPC and FTIR methods in following the different steps of polymerization as well as those from the linear plots of the end time of reaction vs. the 1/T, were in good agreement.}, keywords = {Polyurethane,GPC,FTIR,Cure,Postcure,Accelerate aging,NCO concentration}, url = {https://ijcce.ac.ir/article_10437.html}, eprint = {https://ijcce.ac.ir/article_10437_f89ec3d14b8db86570a96ca3a92403fd.pdf} }