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Item 101 Solved Civil Engineering Problems(2001) Michael R.LindeburgItem 1300 Math Formulas(2004) Alex SvirinItem 16th Iee Wiring Regulations Explained And Illustrated Seventh Edition(1989) Brian ScaddanItem 17th Edition Iet Wiring Regulations Explained And Illustrated Tenth Edition(2015) Brian ScaddanItem Item 17th Iee Wiring Regulations Explained And Illustrated Eighth Edition(2008) Brian ScaddanItem 17th Iee Wiring Regulations Explained And Illustrated Ninth Edition(2011) Brian ScaddanItem 17th Iee Wiring Regulations Inspection Testing And Certification(2008) Brian ScaddanItem Item 2-amino-5-Aryl-2-oxazolines. Potent New Anorectic Agents(2012-11-21)2-amino-5-Aryl-2-oxazolines. Potent New Anorectic AgentsItem Item 300 Solved Problems Soil Rock Mechanics And Foundations Engineering(2009) Luis A.Prieto PortarItem 3000 Solved Problems In Electric Circuits(1988) Mc Graw HillItem 35 Years Of Fuzzy Set Theory(2010) springerItem 35 Years Of Fuzzy Set Theory(2010) springerItem 3d Automotive Modeling(2011) Andrew GahanItem The [4 + 2] Addition of Singlet Oxygen to Thebaine: New Access to Highly Functionalized Morphine Derivatives via Opioid Endoperoxides(2012-11-20) Dolores Lo´pez; Emilio Quin˜ oa; Ricardo RigueraThe [4 + 2] Addition of Singlet Oxygen to Thebaine: New Access to Highly Functionalized Morphine Derivatives via Opioid EndoperoxidesItem 4-Dimethylaminopyridine as a catalyst in heroin synthesis(2012-11-20) S. KlemencIn this paper, we describe an acetylating method for fast synthesis of heroin from morphine in the presence of 4- dimethylaminopyridine (4-DMAP) as a catalyst. In the reaction which led to heroin formation, the morphine base was subjected to a solution made up of 4-DMAP (catalyst), methylene chloride (solvent) and acetic anhydride (acetylating agent). We showed that in comparison with classic acetylating procedures, reaction time can be reduced from at least several hours at elevated temperatures to <10 min at room temperature. In general, reaction time is dependant on the molar concentration ratio between morphine and 4-DMAP. # 2002 Elsevier Science Ireland Ltd. All rights reserved