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- W998466383 abstract "This chapter discusses studies focusing on erythrina alkaloids. In the case of the aromatic Erythrina alkaloids, the apo-rearrangement is accompanied by cleavage of the aromatic ether linkages in ring D so that the product in each case is apoerysopine. Also, because the apo-rearrangement results in destruction of both asymmetric atoms, apoerysopine and apo-β-erythroidine are optically inactive. Proof for the indoline structures, is now quite abundant. The spectral and physical properties, particularly the weak basicity, of these molecules are in agreement with the assigned structures. Apo-β-erythroidine is readily dehydrogenated to a true indole derivative. When apo-β-erythroidine is oxidized with permanganate, it yields 7-carboxyisatin and 2-aminoisophthalic acid, showing the points of attachment to be at the 1 and 7 positions of the indoline nucleus. Both apo-β-erythroidine and the dimethyl ether of apoerysopine have been carried through the Hofmann exhaustive methylation procedure, and these reactions are illustrated in the chapter. The infrared absorption spectra were particularly valuable in showing that the intermediate olefins are of the type, RCH = CH2." @default.
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- W998466383 date "1960-01-01" @default.
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- W998466383 title "Chapter 11 The Erythrina Alkaloids" @default.
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