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Carbenes and Nitrenes: Structure, generaNon and reacNvity
Carbenes and Nitrenes: Structure, generaNon and reacNvity

... Then,  N-­‐heterocyclic  carbenes  (NHCs)  already  seen. The  first  applica4ons  of  thiazolydenes  in  umpolung  organocatalysis  were  reported  as early  as  1943  (J.  Pharm.  Soc.  Jpn.  1943,  63,  296)  and  metal  complexes  of  NHC ...
Grignard Reactions - faculty at Chemeketa
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Organic Chemistry - City University of New York
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... desired effect even more pronounced. There has only been one general method known to convert meso-tetraphenyl 45 porphyrins into the corresponding chlorins, namely the diimide reduction introduced by Whitlock et aI., "Diimide Reduction of Porphyrins", J. Am. Chern. Soc., 91, 7485-89 (1969). However, ...
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Tiffeneau–Demjanov rearrangement



The Tiffeneau–Demjanov rearrangement (TDR) is the chemical reaction of a 1-aminomethyl-cycloalkanol with nitrous acid to form an enlarged cycloketone.The Tiffeneau–Demjanov ring expansion, Tiffeneau–Demjanov rearrangement, or TDR, provides an easy way to increase amino-substituted cycloalkanes and cycloalkanols in size by one carbon. Ring sizes from cyclopropane through cyclooctane are able to undergo Tiffeneau–Demjanov ring expansion with some degree of success. Yields decrease as initial ring size increases, and the ideal use of TDR is for synthesis of five, six, and seven membered rings. A principal synthetic application of Tiffeneau–Demjanov ring expansion is to bicyclic or polycyclic systems. Several reviews on this reaction have been published.
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