4 research outputs found
âWomen In Science & Engineering â KIRAN (WISE-KIRAN)â A Step Towards Gender Equity in STI
56-57Recognizing this challenge, the Department of Science and Technology (DST) has been actively engaging to remove the obstacles in participation of women in the field of S&T through gender enabling programs over the past two decades
Optimum Transplanting Dates for Rice in Kerala, India, Determined Using Both CERES v3.0 and ClimProb
Reactivity of Elemental Tin and Zinc toward Organophosphonic Acid Dialkyl Esters: A New One-Pot Recipe for the Synthesis of Coordination Assemblies Derived from <i>O</i>âAlkylorganophosphonate Ligands
A new recipe for the synthesis of
diorganotin bisÂ(<i>O</i>-alkylorganophosphonate)Âs, R<sup>1</sup><sub>2</sub>SnÂ{OÂ(P)Â(O)Â(OR<sup>1</sup>)ÂR}<sub>2</sub> [R =
R<sup>1</sup> = methyl (<b>1</b>); R<sup>1</sup> = ethyl and
R = methyl (<b>2</b>), allyl (<b>3</b>), 2-thienyl (<b>4</b>), benzyl (<b>5</b>)], has been developed from the
direct reaction of elemental tin (powder) with organophosphonic acid
dialkyl esters, RPÂ(O)Â(OR<sup>1</sup>)<sub>2</sub>, in the presence
of a catalytic amount of potassium iodide under ambient conditions
(130 °C, 18â20 h). The key steps in the proposed catalytic
cycle involve the monodealkylation of phosphonate diester and in situ
generation of a R<sup>1</sup>SnI or R<sup>1</sup><sub>2</sub>SnI<sub>2</sub> intermediate via the oxidative addition of alkyl iodide on
tin. Evidence in support of the formation of organotin species comes
from the isolation of Me<sub>2</sub>SnÂ{OÂ(P)Â(O)Â(O<sup><i>i</i></sup>Pr)ÂMe}<sub>2</sub> (<b>6</b>) from the direct reaction
of tin metal with MePÂ(O)Â(O<sup><i>i</i></sup>Pr)<sub>2</sub> in the presence of methyl iodide. The method has also been extended
to isolate ZnÂ{OPÂ(O)Â(OMe)ÂMe}<sub>2</sub> (<b>7</b>) using metallic
zinc as the precursor. All of the compounds have been characterized
by IR and NMR studies as well as X-ray crystallography for <b>2</b>, <b>4</b>, <b>6</b>, and <b>7</b>