- The catalytic asymmetric acetalization
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In straitened circumstances: In an asymmetric version of the acid-catalyzed acetalization of aldehydes, a novel member of the chiral confined Bronsted acid family significantly outperformed previously established catalysts, providing cyclic acetals with e
- Kim, Ji Hye,Coric, Ilija,Vellalath, Sreekumar,List, Benjamin
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supporting information
p. 4474 - 4477
(2013/05/21)
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- Formation of α-hydroxyketones via irregular Wittig reaction
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Αddition reactions of (1-methoxyalkyl)triphenylphosphonium ylides, derived from the corresponding Wittig salts and n-BuLi, to aldehydes were investigated. It was revealed that the betaine LiX complexes, the primary adducts, were converted to α-hydroxyketones, prior to the formation of oxaphosphetanes, by addition of aqueous NH4Cl at low temperature.
- Okada, Hideki,Mori, Tomonori,Saikawa, Yoko,Nakata, Masaya
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supporting information; experimental part
p. 1276 - 1278
(2009/09/05)
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- STUDY OF (1-ALKOXYETHYL)DIPHENYLPHOSPHINE OXIDES. I. SYNTHESES AND STRUCTURAL ANALYSES OF PHENYLETHOXY, METHOXY AND ISOPENTYLOXY DERIVATIVES
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1-Phenylethoxy- (9), 1-methoxy- (10), 1-isopentyloxy- (11) and 1-dodecyloxy- (12) ethyldiphenylphosphine oxides, key intermediates in the stereospecific syntheses of vinyl ethers, have been synthesised and characterised by 1H NMR and 13C NMR, IR and mass spectra.The crystal structures of compounds 9-11 have been determined by X-ray analysis.In the solid state only monomeric molecules have been found, despite the evidence of dimer formation in the mass spectra.The three molecules are in different conformations and a comparison with the geometry of similar compounds, retrieved from the Cambridge Structural Database, indicates a dominant contribution of the steric factors in dictating the different conformations.
- Ugliengo, Piero,Ahmed, Jamil,Viterbo, Davide,Calleri, Mariano,Ceruti, Maurizio
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p. 487 - 492
(2007/10/02)
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- 13C NMR Chemical Shifts - a Conformational Probe for 1-Alkoxyalkyl Esters
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Eighteen 1-alkoxyalkyl formates, acetates and propionates, , have been analysed by 13C NMR spectroscopy.When the chain length of R1, R2 or R3 increases, the 13C NMR resonances of C1, C2 and C3, respectively, shift to lower field.In addition to the primary substituent effects there are a few but minor interactive influences which, however, are clearly significant.All of these effects can be used to predict the most favoured conformation of the 1-alkoxyalkyl esters.
- Pihlaja, Kalevi,Lampi, Aija
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p. 196 - 199
(2007/10/02)
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- Process for the preparation of N-α-alkoxyalkyl-carboxamides, and some representatives of this class of compounds and secondary products obtained therefrom
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N-α-Alkoxyalkyl-carboxamides are prepared by reacting primary or secondary amides of aliphatic, araliphatic or aromatic carboxylic acids, or cyclic carboxamides (lactams) which are not capable of forming an aromatic system, with open-chain α-halogenoalkyl
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- Novel amino derivatives of 5-(2-hydroxystyryl)-isoxazole, their preparation and therapeutic formulations containing these compounds
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Novel aminopropanol derivatives of 5-(2-hydroxystyryl)-isoxazole and their addition salts with acids, their preparation, pharmaceutical formulations containing these compounds, and their use in the treatment of hypertonia, coronary heart disease and cardiac arrhythmias.
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- Method of preparing polynuclear, halogenated, aromatic benzyl ethers
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An aromatic polynuclear, halogenated, aromatic benzyl ether of the formula STR1 WHEREIN W is a chlorine or bromine atom or a methyl radical or the radical --CH2.Z, said radical W being disposed in the ortho, meta or para position with respect t
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