01623nas a2200145   4500008004100000245012200041210006900163260000800232520100300240100002501243700002401268700002801292700002801320856012901348       2019                        eng d00aMnO2@Fe3O4 Magnetic Nanoparticles as Efficient and Recyclable Heterogeneous Catalyst for Benzylic sp(3) C-H Oxidation0 aMnO2Fe3O4 Magnetic Nanoparticles as Efficient and Recyclable Het  cSEP3 a<p>Herein, we report a highly chemoselective and efficient heterogeneous MnO2@Fe3O4 MNP catalyst for the oxidation of benzylic sp(3) C-H group of ethers using TBHP as a green oxidant to afford ester derivatives in high yield under batch/continuous flow module. This catalyst was also effective for the benzylic sp(3) C-H group of methylene derivatives to furnish the ketone in high yield which can be easily integrated into continuous flow condition for scale up. The catalyst is fully characterized by spectroscopic techniques and it was found that 0.424 % MnO2@Fe3O4 catalyzes the reaction; the magnetic nanoparticles of this catalyst could be easily recovered from the reaction mixture. The recovered catalyst was recycled for twelve cycles without any loss of the catalytic activity. The advantages of MnO2@Fe3O4 MNP are its catalytic activity, easy preparation, recovery, and recyclability, gram scale synthesis with a TOF of up to 14.93 h(-1) and low metal leaching during the reaction.</p>
1 aPandey, Akanksha, M.1 aAgalave, Sandip, G.1 aVinod, Chathakudath, P.1 aGnanaprakasam, Boopathy  uhttps://library.ncl.res.in/content/mno2fe3o4-magnetic-nanoparticles-efficient-and-recyclable-heterogeneous-catalyst-benzylic01682nas a2200205   4500008004100000022001400041245011900055210006900174260000800243300001400251490000700265520092200272100002101194700002901215700002501244700002301269700002601292700002801318856013001346       2023                        eng d  a0022-326300aCatalyst-assisted selective vinylation and methylallylation of a quaternary carbon center using tert-butyl acetate0 aCatalystassisted selective vinylation and methylallylation of a   cJUL  a9686-97030 v883 a<p>
	The In-(OTf)(3)-catalyzed &amp; alpha;-vinylationof varioushydroxy-functionalized quaternary carbon centers using in situ generatedisobutylene from tert-butyl acetate is presentedas a novel synthetic methodology. Moreover, tert-butylacetate is a nonflammable feed stock and is a readily available sourcefor the in situ production of vinyl substituents, as demonstratedby the vinylation reaction with quaternary hydroxy/methoxy compounds.Moreover, an excellent selectivity for methylallylation over vinylationwas obtained with Ni-(OTf)(2) as a catalyst. In the case ofperoxyoxindole, methylallyl-functionalized 1,4-benzoxazin-3-one derivativeswere formed through the sequential rearrangement of peroxyoxindolefollowed by the nucleophilic attack by isobutylene. The detailed mechanismfor this reaction and rationalization for the selectivity are providedusing kinetics and density functional theory studies.</p>
1 aMohanta, Nirmala1 aSamal, Pragnya, Paramita1 aPandey, Akanksha, M.1 aMondal, Shankhajit1 aKrishnamurty, Sailaja1 aGnanaprakasam, Boopathy  uhttps://library.ncl.res.in/content/catalyst-assisted-selective-vinylation-and-methylallylation-quaternary-carbon-center-using