IR@NEIST - North East Institute of Science and Technology (CSIR)
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Synthesis of some complex pyrano[2,3-b]- and pyrido[2,3-b]quinolines from simple acetanilides via intramolecular domino hetero Diels–Alder reactions of 1-oxa-1,3-butadienes in aqueous medium
Get PDFSome complex pyrano[2,3-b]- and pyrido[2,3-b]quinolines were synthesized from simple acetanilides via
intramolecular domino hetero Diels–Alder reactions of 1-oxa-1,3-butadienes using water as solvent
Density, ultrasonic velocity, electrical conductivity, viscisity and Raman Spectra of methanolic Mg(ClO4)2, Mg(NO3)2 and Mg(OAc)2 solutions
Get PDFDensity, ultrasonic velocity, electrical conductivity, viscosity, and Raman spectra of methanolic Mg(ClO4)2,
Mg(NO3)2, and Mg(OAc)2 solutions were measured as functions of concentration (dilute to saturation) and
temperature (273.15 e T/K e 313.15). The isentropic compressibility, electrical conductivity, and Raman
spectral data reveal the following order of anion-solvent interactions and mobility in methanol: OAc- <
NO3
- < ClO4
-. Anionic effect on the isentropic compressibility and conductivity roughly appear to follow
Hofmeister series. Transport properties and Raman spectra also indicate a moderate solvent-shared ion pairing
in concentrated Mg(NO3)2 solutions
Insect pests of tea and their management
Get PDFGlobally, 1031 species of arthropods are associated with the intensively
managed tea Camellia sinensis (L.) O. Kuntze monoculture. All parts of
the plant, leaf, stem, root, flower, and seed, are fed upon by at least one
pest species, resulting in an 11%–55% loss in yield if left unchecked.
There has been heavy use of organosynthetic pesticides since the 1950s
to defend the plant against these pests, leading to rapid conversion of
innocuous species into pests, development of resistance, and undesirable
pesticide residues in made tea. As a result of importer and consumer
concerns, pesticide residues have become a major problem for the tea
industry. Integrated pest management (IPM) may help to overcome the
overuse of pesticides and subsequent residues.We review the advances
made in our understanding of the biology and ecology of major insect
and mite pests of tea, host plant resistance, cultural practices, biocontrol
measures, and need-based application of botanicals and safer pesticides
to understand the present status of IPM and to identify future challenges
to improvement
Sono-leather technology with ultrasound: A boon for unit operations in leather processing - review of our research work at Central Leather Research Institute (CLRI), India
No full textUltrasound is a sound wave with a frequency above the human audible range of 16 Hz to 16 kHz. In recent years, numerous unit
operations involving physical as well as chemical processes are reported to have been enhanced by ultrasonic irradiation. There
have been benefits such as improvement in process efficiency, process time reduction, performing the processes under milder
conditions and avoiding the use of some toxic chemicals to achieve cleaner processing. These could be a better way of
augmentation for the processes as an advanced technique. The important point here is that ultrasonic irradiation is physical method
activation rather than using chemical entities. Detailed studies have been made in the unit operations related to leather such as
diffusion rate enhancement through porous leather matrix, cleaning, degreasing, tanning, dyeing, fatliquoring, oil–water
emulsification process and solid–liquid tannin extraction from vegetable tanning materials as well as in precipitation reaction in
wastewater treatment. The fundamental mechanism involved in these processes is ultrasonic cavitation in liquid media. In addition
to this there also exist some process specific mechanisms for the enhancement of the processes. For instance, possible real-time
reversible pore-size changes during ultrasound propagation through skin/leather matrix could be a reason for diffusion rate
enhancement in leather processing as reported for the first time. Exhaustive scientific research work has been carried out in this
area by our group working in Chemical Engineering Division of CLRI and most of these benefits have been proven with publications
in valued peer-reviewed international journals. The overall results indicate that about 2–5-fold increase in the process efficiency due
to ultrasound under the given process conditions for various unit operations with additional benefits. Scale-up studies are underway
for converting these concepts in to a real viable larger scale operation. In the present paper, summary of our research findings from
employing this technique in various unit operations such as cleaning, diffusion, emulsification, particle-size reduction, solid–liquid
leaching (tannin and natural dye extraction) as well as precipitation has been presente
An Efficient Method for One-Pot Reductive Cleavage of Acetals to Primary Alcohols Using a Bimetal Redox Couple CoCl2.6H2O-Zn
Get PDFAcyclic or cyclic O,O-acetals and O,S-acetals underwent reductive cleavage to give primary alcohols
efficiently on treatment with Zn-CoCl2.6H2O-bimetal redox system in dry tetrahydrofuran at ambient temperature to give
good to excellent yields
Water-Promoted Synthesis of 3,3'- Di(indolyl)oxindoles
Get PDFThe reaction of isatin and indoles in refluxing water/ethanol (7:3) affords 3,3'-
di(indolyl)oxindoles in excellent yields
Synthesis, molecular and crystal structure of a new dicarbonylruthenium(II) complex containing a xantphos dioxide chelating ligand
Get PDFThe reaction of xantphos dioxide (O\O) with the polynuclear precursor [Ru(CO)2Cl2]n to give the mononuclear
complex [Ru(CO)2Cl2(O\O)](1) is reported together with single crystal X-ray structure analyses of
both the free ligand and the ruthenium complex. The synthesized compounds have also been characterized
by elemental analyses, IR and NMR (1H, 31P and 13C) spectroscopy. The ligand O\O crystallizes with
lattice water molecules in a triclinic system with space group P�1 whereas the complex 1 crystallizes in an
orthorhombic system with space group P212121. Each mononuclear unit of O\O and 1 is stabilized in
their solid state through non-covalent (C–H���O, C–H���Cl and C–H���p) interactions to develop an extended
three-dimensional network structure. The complex 1 exhibits an interesting intramolecular O���O interaction
between one of the P@O groups and backbone O leading to different electron donacity of two P@O
groups to the metal centre
