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Magnetic Circular Dichroism Studies XXIII [1] Magnetic Circular Dichroism Spectra of Indole Alkaloids

✍ Scribed by Günter Barth; Robert E. Linder; Edward Bunnenberg; Carl Djerassi

Publisher
John Wiley and Sons
Year
1972
Tongue
German
Weight
477 KB
Volume
55
Category
Article
ISSN
0018-019X

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✦ Synopsis

T h c magnetic circular dichroism spectra of a numbcr of indolc alkaloids show two B-tcrms of opposite sign in thc 250-330 nni wavelength region associated with the l L b and lL, clectronic transitions, thc long ivavelength, lLt,, band being of positive sign, whereas both bands strongly ovcrlap in absorption. S'arious substituents in different positions of the indolc ring cause a red shift of both bands and a broadcning of tlic 1011g wuvclength B-tcrin. 'The sign pattern, however, remains unchanged in all examplcs thus far invcstigatctl. Dihydroindolc and oxindolc, on the other hand, exhibit MCD. bands with the oppositc sign sequcnce as compared t o the indolc chromophore. This obscrvation allows identification of the indolc chromophoi-c in alkaloids from the sign pattern of tlic MCD. bands.

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