Manuel Jiménez

The revised structure of mortonin

Abstract The structure 1 previously proposed tor mortonin, is revised to 2 based on spectroscopic and chemical evidence, and on biogenetic considerations.

The sesquiterpene constituents of Mortonia hidalgensis

Abstract The structure of mortonol B, a sesquiterpene constituent of Mortonia hidalgensis , was established as 2β-acetoxy-mortonol A. Mortonol B is propose

Isolation and structure of mortonol A, a possible biogenetic sesquiterpene precursor of mortonins A, C and D☆

Abstract The structure of mortonol A isolated from Mortonia greggii was established as a benzoate diester of 1α,4β,9β-trihydroxy-dihydroagarofurane-6-one. Its structure and stereochemistry were determined by chemical and spectroscopic means.

Polyhydroxyagarofuran derivatives from Rzedowskia tolantonguensis

Abstract The structures of Rzedowskins A, B, C and D, new sesquiterpenes of the polyhydroxyagarofuran-type and constituents of Rzedowskia tolantonguensis, were established by chemical and spectroscopic methods.

Confertdiolide, a novel sesquiterpenoid lactone from Parthenium

Abstract Four sesquiterpene lactones were isolated from several populations of Parthenium confertum var. lyratum (Gray) collected in Sierra de Arteaga, southern Coahuila. Three of the compounds, hysterin, tetraneurin E and hymenin were previously isolated from other Parthenium species. The fourth constituent is the new cyclopropanoid sesquiterpene dilactone confertdiolide which represents a new structural type. The photolytic conversion of hymenin into confertdiolide confirmed its structure.

Photolysis of mortonin

Abstract Irradiation of mortonin (2a), gave an isomeric photoproduct called photomortonin, whose structure was proved to be 3a.

The photochemistry of tetrahydro zexbrevin

Abstract The photolysis of tetrahydro zexbrevin 2, gave in high yield the photoisomerization product 3, its structure was determined by chemical and spectroscopic means. The formation of the photoproduct 3 could involve an intramolecular hydrogen shift. The photoproducts 7 and 9 were also isolated and their structures determined.