J. Romo

The constituents of Cacalea decomposita A. Gray : Structures of cacalol and cacalome

Abstract Cacalol and cacalone, isolated from the roots of Cacalea decomposita A. Gray, have been shown to be furotetralin derivatives with structures Ia and IX.

Estafiatin, a new sesquiterpene lactone isolated from Artemisia mexicana (Willd)

Abstract The structure of estafiatin, a constituent of Artemisia mexicana W. has been established as a sesquiterpenic epoxylactone of the guaiane series.

The constituents of cacalia decomposita a. gray. structures of maturin, maturinin, maturone and maturinone

Abstract The structures of maturin (IIa), maturinin (VI), maturone (VIIb) and maturinone (VIIa) have been established as furonaphthalene derivatives, closely related to cacalo (Ia) and cacalone (Ib).

Constituents of zaluzania species—II : Structures of zaluzanin C and Zaluzanin D

Abstract Zaluzanin C a constituent of Zaluzania augusta (Lag.) Schultz, Bip. and Z. triloba Pers has been shown to be a guaianolide with structure Ia. Zaluzanin D another constituent of Z. triloba was identified as acetylzaluzanin C (Ib). The eudesmanolide ivalin (XI) was also isolated from Z. triloba .

Constituents of Artemisia and chrysanthemum species-the structures of chrysartemins A and B

Abstract The guaianolides matricarin (Ib) and desacetylmatricarin (Ia) have been found as constituents of Artemisia klotzchiana . The eudesmanolides arglanin (VIII) and douglanin (IXa) were isolated from A. mexicana . The new guaianolides chrysartemin A (II) and B (XIV) are constituents of Chrysanthemum parthenium . Chrysartemin A (II) was also found in A. mexicana and A. klotzchiana .

The constituents of helenium aromaticum (Hook) Bailey : The structures of aromatin and Aromaticin☆

Abstract Helenalin, Mexicanin I and two new sesquiterpene lactones; aromatin and aromaticin were isolated from the Chilean plant Helenium aromaticum. The structures of the new lactones have been established. Aromatin is 6-desoxyhelenalin and aromaticin is 6-desoxymexicanin I.

The guaianolides of ambrosia cumanensis HBK : The structures of cumambrins A and B☆

Abstract Cumambrins A and B isolated from Ambrosia cumanensis HBK were shown to be guaianolides with structures Ia and Ib.

The structure of cumanin, a constituent of ambrosia cumanensis

Abstract Cumanin a constituent of Ambrosia cumanensis has been shown to be a sesquiterpene lactone, whose structure is represented by Ia.

Studies in perezone derivatives : Structures of the pipitzols and perezinone

Abstract α and β-pipitzols isolated from the roots of Perezia cuernavacana and obtained by thermal rearrangement of perezone, (II), have been shown to be sesquiterpenes with structures IIIa and IVa related to cedrene (XXIII). The structure of perezinone has been revised and established as shown in formula XXVI.

Mexicanin—I. A new sesquiterpene lactone related to tenulin

Abstract Mexicanin I a new sesquiterpene lactone isolated from Helenium mexicanum H.B.K. has been correlated with tenulin.