@article {46289, title = {Lithium compounds as single site catalysts for hydroboration of alkenes and alkynes}, journal = {Chemical Communications}, volume = {55}, year = {2019}, month = {OCT }, pages = {11711-11714}, type = {Article}, abstract = {

The hydroboration of alkenes and alkynes using easily accessible lithium compounds [2,6-di-tert-butyl phenolatelithium (1a) and 1,1 {\textquoteleft} dilithioferrocene (1b)] has been achieved with good yields, high functional group tolerance and excellent chemoselectivity. Deuterium-labeling experiments confirm the cis-addition of pinacolborane. The methodology has been further extended to myrcene, which undergoes selective 4,3-hydroboration. DFT calculations provide insights into the mechanism.

}, issn = {1359-7345}, doi = {10.1039/c9cc05783h}, author = {Bisai, Milan Kumar and Yadav, Sandeep and Das, Tamal and Vanka, Kumar and Sen, Sakya S.} } @article {47058, title = {Lithium compound catalyzed deoxygenative hydroboration of primary, secondary and tertiary amides}, journal = {Dalton Transactions}, volume = {50}, year = {2021}, month = {FEB}, pages = {2354-2358}, type = {Article}, abstract = {

A selective and efficient route for the deoxygenative reduction of primary to tertiary amides to corresponding amines has been achieved with pinacolborane (HBpin) using simple and readily accessible 2,6-di-tert-butyl phenolate lithium center dot THF (1a) as a catalyst. Both experimental and DFT studies provide mechanistic insight.

}, issn = {1477-9226}, doi = {10.1039/d1dt00364j}, author = {Bisai, Milan Kumar and Gour, Kritika and Das, Tamal and Vanka, Kumar and Sen, Sakya S.} } @article {48154, title = {Luminescent magnesium complexes with intra- and inter-ligand charge transfer}, journal = {Chemical Communications}, volume = {58}, year = {2022}, month = {OCT}, pages = {11843-11846}, type = {Article}, abstract = {

Herein, we report two 2,2{\textquoteright}-pyridylpyrrolide (PyPyrH) ligand supported magnesium complexes (1 and 2), which demonstrate bright luminescence with a quantum yield of 22\% and 14\% in the solid state, respectively. Theoretical calculations reveal that their emissive properties originate from the intra- and inter-ligand charge transfer.

}, issn = {1359-7345}, doi = {10.1039/d2cc04142a}, author = {Kumar, Rohit and Pahar, Sanjukta and Chatterjee, Joy and Dash, Soumya Ranjan and Gonnade, Rajesh G. and Vanka, Kumar and Sen, Sakya S.} } @article {48938, title = {Lanthanide mimicking by magnesium for oxazolidinone synthesis}, journal = {Chemistry- a european journal}, volume = {30}, year = {2024}, month = {JAN }, type = {Article}, abstract = {

In the last decade, magnesium complexes have emerged as a viable alternative to transition-metal catalysts for the hydrofunctionalization of unsaturated bonds. However, their potential for advanced catalytic reactions has not been thoroughly investigated. To address this gap, we have developed a novel magnesium amide compound (3) using a PNP framework that is both bulky and flexible. Our research demonstrates that compound 3 can effectively catalyze the synthesis of biologically significant oxazolidinone derivatives. This synthesis involves a tandem reaction of hydroalkoxylation and cyclohydroamination of isocyanate using propargyl alcohol. Furthermore, we conducted comprehensive theoretical calculations to gain insights into the reaction mechanism. It is important to note that these types of transformations have not been reported for magnesium and would significantly enhance the catalytic portfolio of the 7th most abundant element. A monomeric magnesium compound was employed as a catalyst for the cascade cyclization of propargylic alcohol and isocyanate, resulting in the formation of pharmaceutically significant oxazolidinone derivatives. This transformation, previously attributed solely to transition metals or lanthanides, signifies a noteworthy advancement.image

}, keywords = {catalysis, Magnesium, oxazolidinone, pincer ligand, Sustainability}, issn = {0947-6539}, doi = {10.1002/chem.202303478}, author = {Kumar, Rohit and Mahata, Biplab and Gayathridevi, S. and Raj, K. Vipin and Vanka, Kumar and Sen, Sakya S.} }