01629nas a2200277   4500008004100000022001400041245010600055210006900161260007300230300001200303490000800315520066700323653000800990653001300998653002301011653002401034100002501058700002101083700002001104700001901124700001601143700001701159700002001176700002501196856013001221       2014                        eng d  a1381-116900a1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU): a highly efficient catalyst in glycerol carbonate synthesis0 a18Diazabicyclo540undec7ene DBU a highly efficient catalyst in gl  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcSEP  a144-1490 v3913 a<p>Transesterification of dimethyl carbonate (DMC) with glycerol (GLY) was investigated using various amines as catalysts. Amidines like 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) and 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) were found to be the best catalysts for this reaction. Best results: 98% conversion of GLY with 96% selectivity to GC (TON: 9408), were obtained with DBU as a catalyst. Effect of various reaction conditions on activity and selectivity were investigated using DBU as catalyst. The mechanism of the reaction was investigated with the help of H-1, C-13 and N-15 NMR analysis and OFT calculations. (C) 2014 Elsevier B.V. All rights reserved.</p>10aDBU10aGlycerol10aGlycerol carbonate10atransesterification1 aMunshi, Mudassir, K.1 aGade, Swapna, M.1 aMane, Manoj, V.1 aMishra, Deepti1 aPal, Sourav1 aVanka, Kumar1 aRane, Vilas, H.1 aKelkar, Ashutosh, A.  uhttps://library.ncl.res.in/content/18-diazabicyclo540undec-7-ene-dbu-highly-efficient-catalyst-glycerol-carbonate-synthesis-001155nas a2200241   4500008004100000022001400041245007400055210006900129260008600198300001400284490000700298520033600305653001900641653001600660653000800676653000900684100002500693700001400718700002300732700002600755700002800781856010400809       2014                        eng d  a0039-791100aNucleophilic ring-opening of benzoxazinones by dbu: some observations0 aNucleophilic ringopening of benzoxazinones by dbu some observati  a530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USAbTAYLOR & FRANCIS INCcAUG  a2955-29600 v443 a<p>This communication demonstrates the formation of an unusual nucleophilic ring opening of benzoxazinones by 1,8-diazabicycloundec-7-ene (DBU). This observation contradicts the intrinsic feature of a hindered nonnucleophilic base like DBU. Confirmation of the product was achieved via single-crystal X-ray diffraction studies.</p>10aBenzoxazinones10acaprolactam10aDBU10aHATU1 aBaravkar, Sachin, B.1 aRoy, Arup1 aGawade, Rupesh, L.1 aPuranik, Vedavati, G.1 aSanjayan, Gangadhar, J.  uhttps://library.ncl.res.in/content/nucleophilic-ring-opening-benzoxazinones-dbu-some-observations-0