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- W1694048600 abstract "Publisher Summary This chapter discusses the six-membered ring systems—namely, pyridine and benzo Derivatives. Use of aliphatic nitro compounds to prepare a variety of pyridines, 1,4-dihydropyridines, and 2-pyridiones is reviewed in the chapter, along with the syntheses of pyridines by catalysis and subsequent derivatization reactions. Cyclotrimerization of alkynes and chiral nitriles gives chiral-substituted pyridines using Co(I) catalysis. Nekrasov reviewed the heterodiene approach to pyridines using cyanamides. Selective cyclotrimerization of alkynes with nitriles produced pentasubstituted pyridines with little formation of benzenoid products. Similar cyclotrimerizations have been accomplished with irradiation in 3 hours but in lower yield. Rhodium catalysis has been found to yield pyridines without irradiation in slightly longer times, but the unsymmetrical alkynes have led to isomeric products. 2-Pyridones with 5-phosphonate ester substituents can be made from alkynes and enamine derivative. Malononitrile condenses with 3-pyridinecarboxaldehyde and a ketone to form substituted bipyridines. Chloride anion has been used to effect dehydrochlorination of pyridone. The product is an important intermediate for agricultural compounds." @default.
- W1694048600 created "2016-06-24" @default.
- W1694048600 creator A5030967086 @default.
- W1694048600 creator A5080174863 @default.
- W1694048600 date "1996-01-01" @default.
- W1694048600 modified "2023-09-27" @default.
- W1694048600 title "Chapter 6.1 Six-membered ring systems: Pyridine and benzo derivatives" @default.
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