Abstract

VISWANADHAM, Balaga; SINGH, Sooboo; FRIEDRICH, Holger B.  and  MAHOMED, Abdul S.. The Role of Bronsted and Lewis Acidity in the Green Synthesis of Homopropargyl Alcohols over HZSM-5. S.Afr.j.chem. (Online) [online]. 2018, vol.71, pp.62-67. ISSN 1996-840X.  http://dx.doi.org/10.17159/0379-4350/2018/v71a8.

A highly efficient and simple reaction under exceptionally mild conditions is shown for the synthesis of biologically and pharma-ceutically active molecules of homopropargyl alcohol using HZSM-5 as the catalyst. Products analyzed by IR, 1H NMR, 13C NMR and GC-MS showed consistent yields of 98 % of the alcohol, even with respective recycles of the regenerated catalyst. The reaction was also carried out with selected mineral acids, acidic oxides and other acidic catalysts to compare reactivity and the influence of the type of acidity involved in the reaction. The results indicate that the presence of both Bronsted and Lewis acidity is beneficial for inducing a high rate of reaction when compared to systems having either predominantly Bronsted or Lewis acidity.

Keywords : Homopropargyl; zeolites; HZSM-5.

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