Browsing by Author "Castañeda Magliona, Fernando"

Now showing items 1-14 of 14

    • 3-(Triphenylphosphoranylidene)-pentane-2,4-dione and diethyl 2-(triphenylphosphoranylidene)-malonate 
      Castañeda Magliona, Fernando; Aliaga Silva, Christian Marcelo; Bunton, Clifford A.; Garland, María Teresa; Baggio, Ricardo (BLACKWELL PUBLISHING, 2005-08)
      The title ylides, 3-(triphenylphosphoranylidene) pentane-2,4-dione, C23H21O2P, (I), and diethyl 2-(triphenylphosphoranylidene)malonate, C25H25O4P, (II), differ in the conformations adopted by their extended ylide moieties. ...
    • Conformational analysis of 3-triphenylphosphoranylidene-2,4-pentanedione by NMR spectroscopy and geometrical ... 
      Castañeda Magliona, Fernando; Recabarren Gajardo, Gonzalo Iván; Hu, J.; Gillitt, N. D.; Bunton, Clifford A. (TAYLOR & FRANCIS LTD, 2003-11)
      The diacyl ylide, 3-triphenylphosphoranylidene-2,4-pentanedione (2) can adopt conformations stabilized by ylidic resonance with both acyl oxygens syn- or with one oxygen syn- and the other anti- to cationoid phosphorus, ...
    • Conformational differences in stabilized diketo and diester phosphonium ylides in a solid and in solution 
      Castañeda Magliona, Fernando; Aliaga Silva, Christian Marcelo; Garland, María Teresa; Hu, J.; Gillitt, N. D.; Bunton, Clifford A. (TAYLOR & FRANCIS LTD, 2007-01)
      The diacyl ylid, 3-triphenylphosphoranylidene-2,4-pentanedione 2 can adopt conformations with one oxygen syn- and the other anti- to phosphorus 2a as in the crystal, or with both oxygens syn- to phosphorus 2b. In solution, ...
    • Conformations of monoylidic diester triphenylphosphonium ylides 
      Castañeda Magliona, Fernando; Silva, Paul; Acuña, Cristina; Garland, María Teresa; Bunton, Clifford A. (2013)
      In ylidic triphenylphosphonium carboxylic esters the ester oxygen can be oriented towards (syn) or away (anti) from phosphorus, but except for small ylidic ester groups, e.g., Me, the anti conformer is dominant. With ...
    • Crystal structure and NMR spectra of 3-carboethoxy-3-triphenylphosphoranylidene-2-oxopropane triphenyl ... 
      Barahona Huenchumil, Patricia Mabel; Manríquez Castro, Víctor; Araya Maturana, Ramiro; Castañeda Magliona, Fernando; Delgado Castro, Tomás; Wittke Günther, Oscar (SOCIEDAD CHILENA DE QUIMICA, 1998-12)
      The crystal structure of C42H37O3P2Br has been determined by single crystal X-ray diffraction. The title compound is monoclinic, space group P2(1)/n (Nr. 14), with unit cell parameters a = 11.220(6), b = 14.345(10), c = ...
    • Cyano triphenyl phosphonium ylides stabilized by ester or keto groups: Computed conformations and crystal ... 
      Castañeda Magliona, Fernando; Acuña, C.; Garland, María Teresa; Gillitt, N. D.; Shirazi, A.; Yunes, S. J.; Bunton, Clifford A. (TAYLOR & FRANCIS LTD, 2007)
      The mixed stabilized triphenyl phosphonium ylides Ph3P= C(CN)CO-R and Ph3P= C(CN)COOR, R= CH3, C2H5, CH(CH3)(2), 1a, c and 2a, b, respectively, have sharp H-1 and C-13 NMR signals, except for 2b in some conditions. Ab ...
    • Cyano-stabilized triphenylphosphonium ylids 
      Castañeda Magliona, Fernando; Bunton, Clifford A.; Baggio, Ricardo; Garland, María Teresa (BLACKWELL PUBLISHING, 2007-01)
      Crystalline cyano-stabilized triphenylphosphonium ylids with keto or ester groups give rise to an extended electronic delocalization. In methyl 2-cyano-2-(trimethylphosphonio)-ethenoate, Ph3P=C(CN)CO2CH3 or C22H18NO2P, ...
    • Estudio de ílidos del fósforo en la protección de centros metilénicos activados.- Síntesis de β-cetoésteres ... 
      Castañeda Magliona, Fernando; Rivera, E.; Zanocco Loyola, Antonio (Sociedad Chilena de Química, 1980)
    • Favoured conformations of methyl isopropyl, ethyl isopropyl, methyl tert-butyl, and ethyl tert-butyl ... 
      Castañeda Magliona, Fernando; Silva, Paul; Bunton, Clifford A.; Garland, María Teresa; Baggio, Ricardo (BLACKWELL PUBLISHING, 2008-07)
      The conformations of organic compounds determined in the solid state are important because they can be compared with those in solution and/or from theoretical calculations. In this work, the crystal and molecular structures ...
    • Infrared spectroscopy and ab initio computation in conformer determination of keto ester and diketo ... 
      Bunton, Clifford A.; Castañeda Magliona, Fernando (Elsevier, 2009)
      For stabilized triphenylphosphonium keto ester ylides acyl stretching frequencies of the anti ester group from HF/6-31G(d) calculations fit experimental values with Scale Factor, SF = 0.866, as estimated earlier for the ...
    • Methyl, ethyl, isopropyl and tert-butyl 3-oxo-2-(triphenylphosphoranylidene)butyrates, a common pattern a ... 
      Castañeda Magliona, Fernando; Terraza, C. A.; Garland, María Teresa; Bunton, Clifford A.; Baggio, Ricardo (MUNKSGAARD INT PUBL LTD, 2001-02)
      The crystal structures of four alkyl 3-oxo-2-(triphenylphosphoranylidene)butyrates, where the alkyl group is methyl (C23H21O3P .0.5C(6)H(6)), (II), ethyl (C24H23O3P), (III), isopropyl (C25H25O3P), (IV), or tert-butyl ...
    • Preferred conformations of stabilized phosphorus ylides 
      Castañeda Magliona, Fernando; Terraza, C. A.; Bunton, Clifford A.; Gillitt, N. D.; Garland, María Teresa (TAYLOR & FRANCIS LTD, 2003-09)
      The stabilized phosphorus ylides, Ph3P=C(CO.R')CO.OR, 1, R=Et, R' =CH2P+Ph3; 2, R=R'=Me; 3, R=Et, R'=Me; 4, R=Pr-i; R'=Me, 5, R=Bu-t; R'=Me, adopt a near planar conformation in the crystal which allows extensive electronic ...
    • Síntesis de acetilenos vía acil etoxicarbonil ílidos del fósforo 
      Castañeda Magliona, Fernando; Rivera, E.; Zanocco Loyola, Antonio (Sociedad Chilena de Química, 1980)
      El estudio químico y espectroscópico de los acil etoxicarbonil metilidentrifenilofosforanos I, revela que son compuestos extraordinariamente estables (1). En este trabajo se informa la síntesis de una serie de ílidos ...
    • Thermal decomposition of triphenylphosphonium alkyl ester salts 
      Castañeda Magliona, Fernando; Aliaga Silva, Christian Marcelo; Acuña, Cristina; Silva, Paul; Bunton, Clifford A. (TAYLOR & FRANCIS LTD, 2008-05)
      In thermolyses of molten triphenylphosphonium alkyl ester bromides and chlorides, alkyl=methyl, ethyl, isopropyl, at 130 and 225 degrees C, initial attack of the halide ion on the methyl group gives the methyl halide and ...