Marchantin M trimethyl ether.
The title macrocycle, C(31)H(30)O(5), is comprised of two bibenzyl ether moieties linked cyclically by spacers which each consist of two-carbon alkyl chains. The observed conformation of the macrocycle may be partly stabilized by intramolecular C-H.O close contacts. The packing appears to be directed by van der Waals forces. This work explains the occurrence of a signal found in the (1)H NMR spectra of both marchantinquinone and marchantin M trimethyl ether at delta = 5. 49 and 5.56 p.p.m., respectively. The shift in the position of the expected peak can be explained by the proximity of an H atom belonging to one of the aromatic rings to another ring in the same molecule.
Mombrú
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Laboratorio de Cristalografía y Química del Estado Sólido, Facultad de Química, Universidad de la República, Av. Gral Flores 2124, PO Box 1157, Montevideo, Uruguay. amombru@bilbo.edu.uy
Suescun
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L
Pandolfi
E
E
Seoane
G
G
López
G
G
Mariezcurrena
R
R