01620nas a2200181   4500008004100000022001400041245018100055210006900236260011000305300001600415490000600431520079500437100002401232700002501256700001501281700001701296856012501313       2016                        eng d  a2046-206900aExploration of the diastereoselectivity in an unusual Grignard reaction and its application towards the synthesis of styryl lactones 7-epi-(+)-goniodiol and 8-epi-(-)-goniodiol0 aExploration of the diastereoselectivity in an unusual Grignard r  aTHOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLANDbROYAL SOC CHEMISTRYcMAY  a50721-507250 v63 a<p>An unusual diastereoselective Grignard reaction is explored, where the Grignard reagents are derived from 1,n-dihaloalkanes. A steric bias due to the presence of a quaternary centre adjacent to the acetonide ester at the benzylic position is responsible for the formation of an intramolecularly reduced product in almost quantitative yield. This steric hindrance is responsible for the diastereoselectivity observed with a variety of aromatic as well as aliphatic esters. The unusual Grignard reaction furnishes long chain secondary alcohols possessing a terminal olefin, which are synthetically important intermediates. As an application of this method, the diastereoselective synthesis of styryl lactones viz. 7-epi-(+)-goniodiol (29) and 8-epi(-)-goniodiol (30) has been achieved.</p>1 aChavan, Subhash, P.1 aKhatod, Harshali, S.1 aDas, Tamal1 aVanka, Kumar  uhttp://library.ncl.res.in/content/exploration-diastereoselectivity-unusual-grignard-reaction-and-its-application-towards00816nas a2200157   4500008004100000245012400041210006900165260000800234490000700242520022400249100001700473700001500490700001700505700001900522856011700541       2018                        eng d00aEasily accessible lithium compound catalyzed mild and facile hydroboration and cyanosilylation of aldehydes and ketones0 aEasily accessible lithium compound catalyzed mild and facile hyd  cAPR0 v543 aSimple and readily accessible lithium compounds such as 2,6-ditertbutyl phenolate lithium (1a), 1,1' dilithioferrocene (1b) and nacnac lithium (1c) are found to be efficient single site catalysts for hydroboration of...1 aBisai, Milan1 aDas, Tamal1 aVanka, Kumar1 aSen, Sakya, S.  uhttp://library.ncl.res.in/content/easily-accessible-lithium-compound-catalyzed-mild-and-facile-hydroboration-and01937nas a2200193   4500008004100000022001400041245012200055210006900177260000800246300001600254490000700270520121800277100003301495700001801528700001501546700002601561700003001587856012601617       2021                        eng d  a2040-336400aExcimer to exciplex transition through realization of donor-acceptor interactions in luminescent solvent-free liquids0 aExcimer to exciplex transition through realization of donoraccep  cJUN  a10780-107840 v133 aLuminescent solvent-free organic liquids are known for their enhanced quantum yield, color tunability, and availability of a matrix for other dopants to generate hybrid luminescent materials with improved features for newer applications. Herein, we report a donor-acceptor based luminescent ``exciplex liquid'' by utilizing the slightly different electron affinity of the acceptor molecules. A red-shifted broad exciplex emission exhibited by the donor-acceptor pair even at a lower concentration of the acceptor (0.001 equiv.) indicates high efficiency in the solvent-free state. A detailed NMR study revealed weak intermolecular interactions between the donor and acceptor in the solvent-free matrix that stabilizes the exciplex liquid. The failure of structurally similar solid counterparts to form an exciplex confirms the advantage of the available supportive liquid matrix. Besides, the luminescent exciplex liquid is found efficient in sensing application, which is unachievable by either the individual liquids or their solid counterparts. Here, a transition of a donor-acceptor pair from a solid to solvent-free liquid results in a new hybrid liquid that can be an alternative for solid sensor materials.1 aWakchaure, Vivek, Chandrakan1 aGoudappagouda1 aDas, Tamal1 aRavindranathan, Sapna1 aBabu, Sukumaran, Santhosh  uhttp://library.ncl.res.in/content/excimer-exciplex-transition-through-realization-donor-acceptor-interactions-luminescent