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Pyrrolidine-based amino alcohols: novel ligands for the enantioselective alkyla...
Gonsalves, António M. d'. A. Rocha; Serra, M. Elisa S.; Murtinho, Dina; Silva, Vitor F.; Beja, A. Matos; Paixão, J. A.; Silva, M. RamosA series of easily obtained pyrrolidine-based [beta]-amino alcohols derived from tartaric acid and primary amines was synthesized and used as chiral ligands in the enantioselective alkylation of benzaldehyde. Using diethylzinc, 1-phenyl-1-propanol was obtained with enantiomeric excesses of up to 80% when (3S,4S)-N-(1-naphthylmethyl)-3,4-dihydroxypyrrolidine was used. The nature of the N-substituent on the ligan...
Crystal structure of tetrakis (µ-betaine-O,O') dichloro-dicopper(II) dichloride...
Silva, M. Ramos; Paixão, J. A.; Beja, A. Matos; Veiga, L. Alte da; Martín-Gil, J.[Cu2(bet)4Cl2]Cl2·4H2O (bet = betaine: IUPAC name: trimethylammonioacetate) is monoclinic, space group P21/c, a = 11.0510(10) Å, b = 14.7140(4) Å, c = 11.1620(15) Å, ß = 107.40(2)°. The dinuclear copper(II) cation [Cu2(bet)4Cl2]2+ is counterbalanced by two naked Cl- ions. The copper(II) ions have a square bipyramidal environment with oxygen atoms from the acetato groups in the basal planes and a chlorine and a ...
Crystal structure of the nonlinear optical compound L-arginine fluoride
Silva, M. Ramos; Paixão, J. A.; Beja, A. Matos; Veiga, L. Alte daL-arginine fluoride is a promising compound that exhibits nonlinear optical properties. It efficiently converts two single photons of the same polarization and frequency ? to one photon of frequency 2? (type I phase matching). C6H15N4O2+F- is monoclinic, space group P21, a = 5.4475(4) Å, b = 8.5133(6) Å, c = 10.2195(7) Å, ß = 93.475(6)°. The cation has a zwitterionic form, protonated at both the guanidyl and am...
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