M.S. González

Tetracyclic triterpenes and nerolidol derivatives from Santolina oblongifolia

Abstract Three new dammarane type triterpenes, six polyoxygenated nerolidol derivatives and one tricyclic sesquiterpene, named oblongifolidiol, were isolated from the hexane extract of Santolina oblongifolia. The assigned structures were based on their spectral properties and/or chemical correlations.

Nerolidol-5,8-oxides from the essential oil of santolina oblongifolia

Abstract From the essential oil of Santolina oblongifolia, three new dihydrofurane sesquiterpenoids, related to nerolidol, and a bicyclic sesquiterpene, named α-oplopenone, have been isolated. Their structures and stereochemistry have been assigned by spectroscopic methods.

Sesquiterpenic acids from Leucanthemopsis pulverulenta

Abstract From Leucanthemopsis pulverulenta (Compositae) ten new sesquiterpenic acids have been isolated. Their structures and absolute stereochemistry were assigned by spectral and chemical evidence; they are the first carboxylic acid members of the cadinane and munrolane series to be found in a natural source.

Sesterterpene lactones from Salvia aethiopis: salviaethiopisolide and 13-epi-salviaethiopisolide

Abstract Two sesterterpene lactones and two tetranorlabdanes were isolated from the aerial parts of Salvia aethiopis . Their structures were elucidated by spectroscopic methods, including 2D-NMR experiments, and by the correct interpretation of several chemical transformations.

Four aliphatic esters of Chamaemelum fuscatum essential oil

Abstract Four new aliphatic esters were isolated from the essential oil of Chamaemelum fuscatum . Three are esters of methacrylic acid with 2-methyl-2 E -butenol, 2-hydroxy-2-methyl-3-butenol and 2-hydroxy-2-methyl-3-oxobutanol. The other is neryl isovalerate obtained in addition to known compounds. The structures were determined by spectral measurements and by synthesis.

Δ5-Dehydro-1-hydroxycarvomenthols from the essential oil of Chenopodium multifidum

Abstract The most polar fraction of the essential oil of Chenopodium multifidum is made up of three p -menth-5-en-1,2-diols diastereoisomers. Their absolute configurations have been assigned by spectral methods and by hydrogenation to the 1-hydroxycarvomenthols of known stereochemistry.

2-Methyl-2-hydroxymethylchromenes from Artemisia campestris subsp. glutinosa

Abstract From the non volatile neutral part of a hexane extract from Artemisia campestris subsp. glutinosa , two new 2-methyl-2-hydroxymethyl chromenes h

A mathematical model applied for assisting the estimation of PMI in a case of forensic importance. First record of Conicera similis (Diptera: Phoridae) in a corpse

We present a forensic case associated with skeletonized human remains found inside a cistern in a coastal town located in the eastern Iberian Peninsula (Valencian Regional Government, Spain). In order to analyse the particular environmental conditions that occurred during oviposition and development of the collected insects, estimated temperatures at the crime scene were calculated by a predictive mathematical model. This model analyses the correlation between the variability of the internal temperature depending on the variability of the external ones. The amplitude of the temperature oscillations inside the tank and the containment of the enclosure is reduced by the presence of water. Such variation occurred within about 2h due to the time required for heat exchange. The differential equations employed to model differences between outdoor and indoor temperatures were an essential tool which let us estimate the post-mortem interval (PMI) that was carried out by the study of the insect succession and the development time of the collected Diptera specimens under the adjusted temperatures. The presence of live larvae and pupae of Sarcophagidae and empty pupae of Calliphoridae, Sarcophagidae, Fanniidae, Muscidae, Phoridae and Piophilidae and the decomposition stage suggested the possibility that the remains were in the tank at least a year. We highlight the absence of Calliphora and Lucilia spp., and the first occurrence of the phorid Conicera similis in a human cadaver among the entomological evidence.

Phenolic derivatives from Artemisia campestris subsp. Glutinosa

Abstract From the hexane extract of Artemisia campestris subsp. glutinosa , sakuranetin, dihydroquercetin-7,3′-dimethyl ether and three acetophenone derivatives identified as 3-[4-acetoxyisopent-2( Z )-enyl]-4-hydroxyacetophenone, 3-[4-acetoxyisopent-2( E )-enyl]-4-hydroxyacetophenone and 3-(3-acetoxymethyl-2-hydroxybut-3-enyl)-4-hydroxyacetophenone, have been isolated.

Heliangolides from Leucanthemopsis pulverulenta

Abstract The structure of hispanolide (4,5- cis -3-oxogermacranolide) and three other related germacranolides, isolated from Leucanthemopsis pulverulenta , have been established by a series of chemical transformations and spectral data.