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Organic Chemistry Laboratory (CLRI)
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Environmental Technology Division (CLRI)
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Chemical Engineering Division (CLRI)
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Publication History View all

  • [Show abstract] [Hide abstract]
    ABSTRACT: Efficient processing methodologies such as ultrasounds which would achieve significant enhancements in processes thereby minimizing sectional stream wastes in one hand and bring about economic benefits on other are necessary. Hence, research studies on application of ultrasound in process industries such as leather, textiles and chemicals are gaining importance. In this regard, a case study has been presented in this paper for solid–liquid tanning extraction and tanning from a plant material. For this purpose, Avaram Bark (Cassis Auriculata) which contains ingredients such as ployphenolics, useful in stabilization of collagen, the main constituent of skins/hides. Avaram Bark tannin come under the group of ‘condensed tannins’ useful in main tanning process of leather making. The influence of various process parameters such as ultrasonic power, time and agitation on extraction has been studied. The results show significant 1.6–fold improvement for total extract due to the use of ultrasound, 100 W as compared to magnetic stirring control process, suggesting better mass transfer enhancement in leaching of strongly bound tannins from avaram bark due to ultrasound. Efficacy of tannin extract (10% or 20% offer) has been analyzed through application in tanning process and found to be useful. There has been significant improvement in rate of tannin uptake for ultrasonic extract as compared to control extract by the bovine pelt, suggesting diffusion enhancement of tanning agent through the pelt matrix. Use of ultrasound in avaram extract tanning has also been studied and found to be useful. Therefore, the present study clearly indicates the use of ultrasound in Avaram bark tannin extraction and tanning as a viable option with added advantages even dispensing with external heating.
    Chemical Engineering Research and Design 01/2014;
  • [Show abstract] [Hide abstract]
    ABSTRACT: A one-pot, highly efficient and diastereoselective construction of 1,2-dihyro-10′bH-spiro[indole-3,1′-pyrazole[3,2-a]isoquinoline]-2′-carboxylates via silver triflate-catalyzed [3+2] cycloaddition of N′-(2–alkynylbenzylidene)hydrazide with methyleneindolinones in good to excellent yield has been described. The transformation involves initially a condensation followed by 6-endo-intramolecular cyclization forming dipole which then undergoes [3+2]-cycloaddition with methyleneindolinones and finally, β-hydrogen elimination.
    Tetrahedron Letters 01/2014; 55(4):806–810.
  • [Show abstract] [Hide abstract]
    ABSTRACT: A simple one-pot protocol for the condensation/Knoevenagel reaction/Michael addition/annulation sequence of aldehydes (I) with hydrazines, ethyl acetoacetate and nitroketene-N,S-acetal (IV) to give pyranopyrazoles.
    Tetrahedron Letters 01/2014; 55(12):2010–2014.


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Top publications last week by downloads

Journal of Scientific & Industrial Research. 10/2007; 66:710-715.
Indian journal of experimental biology 12/2009; 47(12):964-8.

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