(2R,3S)-2-Ammonio-3-hydr­oxy-3-(4-nitro­phen­yl)propanoic acid chloride monohydrate

The title compound, C9H11N2O5 +·Cl−·H2O, was synthesized from (1S,2S)-2-amino-1-(4-nitro­phen­yl)propane-1,3-diol in four steps. As demonstrated by this work, no racemization occurs during this synthetic procedure. The crystal structure displays many inter­molecular hydrogen bonds between the acidic cation, chloride anions and the water mol­ecules, forming a three-dimensional network. An intra­molecular bond between the ammonium group and a hydroxyl O atom is also present

Enantiomeric oxidation of organic sulfides by the filamentous fungi Botrytis cinerea, Eutypa lata and Trichoderma viride

The biotransformations of a series of substituted sulfides were carried out with the filamentous fungi Botrytis cinerea, Eutypa lata and Trichoderma viride. Several products underwent microbial oxidation of sulfide to sulfoxide with medium to high enantiomeric purity. With regard to sulfoxide enantioselectivity, the (R)-enantiomer was favoured in biotransformations by T. viride and E. lata while the (S)-enantiomer was favoured in those by B. cinerea. A minor amount of sulfone product was also obtained

Pinacol as a new green reducing agent: molybdenum-catalyzed chemoselective reduction of sulfoxides and nitroaromatics

Pinacol is disclosed as a new chemoselective and environmentally benign reducing agent for sulfoxides and nitroaromatics assisted by readily available dichlorodioxomolybdenum(VI) complexes as catalysts. A wide range of substrates including those bearing challenging functional groups has been efficiently and selectively reduced with acetone and water being the only by-products of these reactionsMinisterio de Ciencia e Innovacion (MICINN) and FEDER (CTQ2010-15358 and CTQ2009-09949/BQU) and Junta de Castilla y Leon (BU021 A09 and GR-172) for financial support. P.G.-G. and M.A.F.-R. thank MICINN for "Juan de la Cierva" and "Ramon y Cajal" contractsThis is the peer reviewed version of the following article:García, N., García-García, P., Fernández-Rodríguez, M. A., Rubio, R., Pedrosa, M. R., Arnáiz, F. J. and Sanz, R. (2012), Pinacol as a New Green Reducing Agent: Molybdenum- Catalyzed Chemoselective Reduction of Sulfoxides and Nitroaromatics. Adv. Synth. Catal., 354: 321–327. doi: 10.1002/adsc.201100877 , which has been published in final form at 10.1002/adsc.201100877. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archivin

Au-delà des apparences : un autre regard sur le Vietnam des années 1990

Madesclaire Yannick. Au-delà des apparences : un autre regard sur le Vietnam des années 1990. In: Tiers-Monde, tome 35, n°140, 1994. pp. 891-906