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- W2376610366 abstract "When sipeimine was fused with potassium hydroxide at various temperatures (260°to320℃),there could be isolated only one and the same crystalline product.Based upon itsempirical formula,physical and chemical properties and those of its derivatives,it was provedto be identical with sipeimone.Pyrolysis of sipeimine resulted only in the recovery of theoriginal substance.Upon treatment with a mixture of concentrated hydrochloric acid and glacial aceticacid,sipeimine gave chlorosipeimine,C_(27) H_(42) O_2NCl,colorless prisms,m.p.206° (dec.),[α]_D~(17°)-19. 37°(CHCl_3) ,as the main product.Chlorosipeimine could not be acetylated,and did notchange upon refluxing with zinc dust in glacial acetic acid,refluxing with silver acetate inmethanol,or heating with 5% aqueous potassium hydroxide.Refluxing with 5% alcoholicpotassium hydroxide converted it into anhydrosipeimine,C_(27) H_(41) O_2N,colorless long prismaticneedles,m.p.170°,[a]_D~(16°)+2. 45°(CHCl_3) .Anhydrosipeimine resisted hydrogenation in thepresence of palladium-charcoal or Adams platinum oxide catalyst in neutral or acidic medium,or in the presence of Raney nickel in alcohol at room temperature.On heating with concentrated alcoholic potash,sipeimine was transformed into an isomer,isosipeimine,colorless fine soft needles,m.p.228°,[a]_D~(16°)+12. 19°(CHCl_3) .Its ultravioletspectra did not show characteristic carbonyl absorption band." @default.
- W2376610366 created "2016-06-24" @default.
- W2376610366 creator A5002725259 @default.
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- W2376610366 date "1956-01-01" @default.
- W2376610366 modified "2023-09-23" @default.
- W2376610366 title "A STUDY OF FRITILLARIA ALKALOIDS--VIII.STUDY ON SIPEIMINE(V).ALKALI FUSION,AND ACID AND ALKALI TREATMENT" @default.
- W2376610366 hasPublicationYear "1956" @default.
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