Studying sulfur functional groups in Norway spruce year rings using S L-edge total electron yield spectroscopy
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The polydentate phosphinoamines 1,3-{(Ph2P)(2)N}(2)C6H4 and 2,6-{(Ph2P)(2)N}(2)C5H3N have been prepared in a single step from the reaction of the amines 1,3-(NH2)(2)C6H4 or 2,6-(NH2)(2)C5H3N with Ph2PCl in presence of Et3N (1:4:4 molar ratio) in CH2Cl2. Re ...
In Jura bogs, on deep and nutrient-poor peat, the ecotone between bog pine forest and Norway spruce forest is sharp and, in a few disturbed situations, no succession pine forest-spruce forest occurs. The bog Les Saignolis lies at the top of an anticline, o ...
As other monosaccharide mimics such as the azasugars and the carbasugars (with nitrogen and carbon atom, respectively, instead of oxygen atom in the ring) the thiosugars (with sulfur atom instead of oxygen atom in the ring) have gained importance in glycob ...
In a bog site in way of paludification, a pine stand is declining, which presently is an infrequent phenomenon on the Swiss Jura scale. A transect was positioned in the bog, from the external and driest part (pine-spruce stand) towards the central and wett ...
Even unsubstituted butadiene adds to sulfur dioxide in the hetero-Diels Alder mode more rapidly than in the chelotropic mode. The sultine can be observed in equilibrium with the diene and the sulfur dioxide only at low temperature and in the presence of CF ...
The reactions of (E,E)-1-benzyloxy-2-methylpenta-1,3-diene (9) with 3,3-dimethyl-2-(trimethylsilyloxy)butene and (Z)-3-(trimethylsilyloxy)pent-2-ene in SO2 and a Lewis acid give silyl sulfinates that are quenched with Met to generate the corresponding (Z)- ...
The hetero-Diels-Alder addition of sulfur dioxide to (E)- and (Z)-4-(fluoromethylidene)-3-methylene-2,3-dihydro-naphthalene follows the endo Alder rule. The first example of a crystalline sultine has been obtained. In agreement with high level quantum calc ...
At -55-degrees-C SO2 adds to 4-[(tert-butyl)dimethylsilyloxy]-1-methoxy-2,3,6,7-tetramethylidenebicyc lo[3.2.1]octane reversibly and selectively onto the s-cis-butadiene moiety at C(2), C(3) giving a single regioisomeric sultine. At -45-degrees-C the chele ...
L'hydrogène et le soufre élémentaire sont produits par irradiation par la lumière visible de solutions d'hydrogène sulfuré ou de sulfure de métaux en presence d'un catalyseur consistant en une matière semiconductrice, telle que le sulfure de cadmium, recou ...
The ene reaction of sulfur dioxide with enoxysilanes or with allylsilanes generates silyl sulfinates that can be brominated (Br-2 or NBS) or chlorinated (NCS or Cl-2) to produce the corresponding sulfonyl halides. They react with primary and secondary amin ...