00765nas a2200145   4500008004100000245006200041210006200103260000800165520023800173100002900411700002800440700003200468700002500500856009400525       2014                        eng d00aAcidic ionic liquids catalyzed depolymerization of lignin0 aAcidic ionic liquids catalyzed depolymerization of lignin  cNOV3 aThe present invention discloses a process for depolymerization of lignin to yield substituted phenolic monomers using Brönsted ionic liquid as catalyst under mild reaction conditions to obtain an overall yield of monomers up to 97%.1 aDhepe, Paresh, Laxmikant1 aKelkar, Ashutosh, Anant1 aMatsagar, Babasaheb, Mansub1 aSingh, Sandip, Kumar  uhttps://library.ncl.res.in/content/acidic-ionic-liquids-catalyzed-depolymerization-lignin01641nas a2200169   4500008004100000245014000041210006900181260000800250300001100258490000800269520097000277100002501247700002501272700001701297700002901314856012801343       2018                        eng d00aUnderstanding interactions between lignin and ionic liquids with experimental and theoretical studies during catalytic depolymerisation0 aUnderstanding interactions between lignin and ionic liquids with  cJUL  a98-1080 v3093 aCompared to H2SO4, Bronsted acidic ionic liquid (BAIL, [C3SO3HMIM][HSO4]) catalyzed depolymerization of lignin yielded higher concentration of low molecular weight products under mild conditions (120 degrees C) as proven by GC and GC-MS. To comprehend this disparity in catalytic activity among H2SO4 and BAIL (at similar H+ concentration), experimental techniques [1D(H-1) NMR, 2D(N-15/H-1 HMBC) NMR and RAMAN] have been employed. Based on these studies, it has been proven that the transfer of electron density from substrate to the electron deficient imidazolium ring via formation of hydrogen bond between -OH/OCH3 (substrate) and -N1C2H2N3-(cation) is possible, while the anion plays an important role. Further, density functional theory (DFT) calculations also corroborated this fact by showing a change in the bond angle and decrease in bond length (C-2-H-2 in imidazole), due to the presence of weak and strong hydrogen bonding between the substrate and IL.1 aSingh, Sandip, Kumar1 aBanerjee, Subhrashis1 aVanka, Kumar1 aDhepe, Paresh, Laxmikant  uhttps://library.ncl.res.in/content/understanding-interactions-between-lignin-and-ionic-liquids-experimental-and-theoretical