La Calotte

1912/12/13 (A7,N327).

Aplicação de análise de componentes principais para verificação de atribuições de sinais nos espetros de RMN ¹H: o caso dos 3-aril (1,2,4)-oxadiazol-5-carboidrazida benzilidenos

The ¹H NMR data set of a series of 3-aryl (1,2,4)-oxadiazol-5-carbohydrazide benzylidene derivatives synthesized in our group was analyzed using the chemometric technique of principal component analysis (PCA). Using the original ¹H NMR data PCA allowed identifying some misassignments of the proton aromatic chemical shifts. As a consequence of this multivariate analysis, nuclear Overhauser difference experiments were performed to investigate the ambiguity of other assignments of the ortho and meta aromatic hydrogens for the compound with the bromine substituent. The effect of the 1,2,4-oxadiazol group as an electron acceptor, mainly for the hydrogens 12,13, has been highlighted.

Constituintes químicos da raiz e do talo da folha do açaí (Euterpe precatoria Mart., Arecaceae)

Phytochemical investigation of the hexane, ethyl acetate and methanolic extracts of roots and leaf stalks of Euterpe precatoria Mart. ("açaí"), afforded stigmast-4-en-6beta-ol-3-one (3); p-hydroxy benzoic acid (4); 3beta-O-D-glucopyranosyl-sitosterol (5); beta-sitosterol palmitate (6); mixtures of beta-sitosterol and stigmasterol (1 and 2), alpha-, beta-amirin and lupeol (7, 8 and 9), friedelin-3-one and 28-hydroxy-friedelin-3-one (10 and 11) and alpha-, beta-D-glucose (12, 13). Except for 1, 2 and 4, the other isolated constituents are described in the genus for the first time. Compounds 3 and 5 gave good results in the brine shrimp bioassay, which detects compounds with potential uses as antitumor agents, pesticides, etc..

Le Capitaliste : journal de la banque parisienne

1906/12/13 (A29,N50).

Le Capitaliste : journal de la banque parisienne

1882/12/13 (A5,N50).

Le Capitaliste : journal de la banque parisienne

1887/12/07 (A10,N49)-1887/12/13.

Le Constitutionnel : journal politique et littéraire

1815/12/13.

Le Constitutionnel : journal politique et littéraire

1816/12/13 (Numéro 348).

Alcaloides β-indolopiridoquinazolínicos de Esenbeckia grandiflora mart. (Rutaceae)

The chemical composition of two specimens of Esenbeckia grandiflora, collected in the south and northeast regions of Brazil, was investigated. In this study, three β-indolopyridoquinazoline alkaloids from the leaves (rutaecarpine, 1-hydroxyrutaecarpine) and roots (euxylophoricine D) were isolated for the first time in this genus. In addition, the triterpenes α-amyrin, β-amyrin, α-amyrenonol, β-amyrenonol, 3α-hydroxy-ursan-12-one, and 3α-hydroxy-12,13-epoxy-oleanane, the coumarins auraptene, umbelliferone, pimpinelin, and xanthotoxin, the furoquinoline alkaloids delbine and kokusaginine, and the phytosteroids sitosterol, stigmasterol, campesterol and 3β-O-β-D-glucopyranosylsitosterol were also isolated from the leaves, twigs, roots and stems of this species. Structures of these compounds were established by spectral analysis.

Le Crédit : journal quotidien / directeur-gérant : Léopold Amail ; [rédacteur en chef : Charles Duveyrier]

1848/12/13 (N43)-1848/12/19 (N49).

Le Démocrate : Organe des Républicains radicaux et radicaux-socialistes du pays de Montbéliard

1906/12/13 (A2,N126).

Les Dimanches de la femme : supplément de la "Mode du jour"

1936/12/13 (A15,N45).

Les Dimanches de la femme : supplément de la "Mode du jour"

1931/12/13 (N510).

L'Univers israélite

1918/12/13 (A74,N14).

Les Faits-divers illustrés : les événements les plus récents, les romans les plus célèbres

1906/12/13 (Numéro 60).