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  • 1
    Electronic Resource
    Electronic Resource
    Mitral Annuloplasty with a Flexible Linear Reducer (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of cardiac surgery 10 (1995), S. 0 
    Details
    ISSN: 1540-8191
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Although the ideal technique is still controversial, mitral valve reconstruction for mitral insufficiency usually includes an annuloplasty. From August 1985 to June 1993, 126 cases of pure, acquired mitral insufficiency were repaired by means of a posterior annuloplasty. Whatever the etiology, all types of mitral insufficiency allowing a mitral reconstruction were included. The annuloplasty, performed with a flexible linear reducer, was associated with valvular (62%) and subvalvular (11%) repairs. An associated surgical procedure was necessary in 62% of the patients. Operative mortality was 2.4%, and follow-up (mean 29 months) was complete for all survivors. Five-year survival was 90%. Five-year complication-free rate for emboli was 91%. Only one patient at 12 months underwent reoperation to treat recurrent mitral insufficiency. Ninety-seven patients were in New York Heart Association Class I or II. Follow-up echocardiographic studies on 75% of eligible patients showed a free rate for significant regurgitation of 99%. Mean valve area was estimated at 2.88 ± 0.85 cm2. These findings suggest that the flexible linear reducer seems to be a reliable device and a valid alternative for annuloplasty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1540-8191.1995.tb01226.x
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  • 2
    Electronic Resource
    Electronic Resource
    Topological implications of Y-conjugation for electronic transitions of cyanine dyes (1987)
    Springer
    Theoretical chemistry accounts 71 (1987), S. 299-304 
    Details
    ISSN: 1432-2234
    Keywords: Graph theory ; Conjugation ; Cyanine spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To understand connections between electronic transitions of dyes having related conjugated systems, topological arguments from graph theory are often helpful. Using the Chebyshev expansion of the characteristic polynomials of cyanines, it is shown that the two possible structures of tribranched cyanines, i.e., a strongly out-of-plane orientation of one of the conjugated branches or a Y-conjugation of the entire unsaturated system, are both consistent with the similarities between visible absorption of these compounds and of simple chains. To choose between these two structures, evidence from other sources should be added.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00529101
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  • 3
    Electronic Resource
    Electronic Resource
    Aza-2-diènes-1,3 4. Préparation et propriétés d'alkyl-1-pyrazone-imines et de leurs isomères (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 1025-1033 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Aza-1,3-dienes. Synthesis and Properties of 1-Alkylpyrazone-imines and their TautomersTreatment of 5-dialkylamino-1,1-dicyano-2-aza-1,3-dienes (or their 1-methoxycarbonyl analogoues) with primary amines gives substituted 1-alkyl-3-cyano-(or methoxycarbonyl-)pyrazoneimines. Tautomeric behaviour, nucleophilic addition to imino function and spectroscopic data of these isomers are examined.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690510
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear spin-spin coupling between 15N and 13C in an azomethine ylide and related compounds (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 269-270 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C—15N coupling constants of a stable azomethine ylide, a 2-aza-1,3-diene and an O-tosyloxime have been measured. The large one-bond coupling constants (21·3 and 21·6 Hz) observed for the azomethine ylide prove the dipolar structure of this compound. For the other two compounds, two-bond coupling constants are used to derive the stereochemistry at the C,N double bond.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270080511
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  • 5
    Electronic Resource
    Electronic Resource
    Analyse Conformationnelle en Serie Alcoylidene-5 Dioxanne-1,3 (1970)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 245-249 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Some 5-alkylidene 2-alkyl 1,3-dioxans have been studied by NMR. Analysis of the spectra leads to the conclusion that these derivatives are predominantly in the chair form, the alkyl substituent on carbon 2 being in the equatorial position. In the case of 5-alkylidene 1,3 dioxans unsubstituted at carbon 2, there is a rapid ring inversion with a very low energy barrier.
    Notes: Un certain nombre d'alcoylidène-5 alcoyl-2 dioxannes-1,3 ont été étudiés par RMN. L'analyse des spectres permet de conclure à une conformation chaise prédominante de ces dérivés, le substituant alcoyle sur carbone 2 se plaçant en position équatorial. Pour les alcoylidène-5 dioxannes-1,3 non substitués sur carbone 2 il y a inversion rapide du cycle avec une barrière énergétique extrěmement faible.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270020304
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  • 6
    Electronic Resource
    Electronic Resource
    Aza-2-diènes-1,3. 2. Synthèse et structure d'un ylure d'azométhine stable (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 2018-2026 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Aza-1,3-dienes. 2. Synthesis and Structure of a Stable Azomethine-ylid.Thermal treatment of 2-(2′-cyano-2′-methoxycarbonyl)methylide-amino-1-morpholino-cyclohexene results in the formation of a stable isomere. Its azomethine-ylid structure is demonstrated from the spectroscopic data (UV., IR., 1H- and 13C-NMR.). 1,3-dipolar cycloaddition reactions of this ylid leads to spiropyrrolines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580716
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  • 7
    Electronic Resource
    Electronic Resource
    Diénamines hétérocycliques. III. Réexamen de la réaction de la base de Fischer avec le tétracyanoéthylène (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 1312-1321 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Heterocyclic dienamines III. A re-examination of the reaction of Fischer's base on tetracyanoethyleneDepending on the order of addition, Fischer's base 5 (1,3,3-trimethyl-2-methylidene-indoline) reacts 1:1 with tetracyanoethylene to give either the tricyanovinylation product 6 or the spiro compound 7. A skeletal rearrangement of a zwitterionic intermediate can explain the formation of the spiro compound. The latter undergoes a thermal isomerization yielding by ring expansion the tetrahydroquinoléine 8. On reaction with LiAlH4 or CH3ONa 7 and 8 lead both to triazatetracycles. All structures are assigned on the basis of spectral data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600420
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  • 8
    Electronic Resource
    Electronic Resource
    Réaction d'énamines dérivées de la cyclohexanone avec le tétracyanoéthylène (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 2576-2583 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction with Tetracyanoethylene of Enamines derived from CyclohexanoneAt room temperature enamines of cyclohexanone react with tetracyanoethylene (TCNE) to give substituted tetrahydroindenes 5. The structures are assigned on the basis of 13C-NMR. data and confirmed by hydrolysis. Spectroscopic studies (IR., UV., ESR.) at different temperatures indicate that the reaction can follow two routes: classical zwitterion formation, or a concurrent electron transfer between the enamines and TCNE leading to the derivates 5. These are the first reported examples of the γ-carbon reactivity of an enamine.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600811
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  • 9
    Electronic Resource
    Electronic Resource
    Aza-2-diènes-1,3 3. Nouvelles voies d'accès à des amino-2-pyrazines substituées (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 793-802 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 2-Aza-1,3-dienes. A New Approach to Substituted 2-AminopyrazinesTreatment of enamines by tosylated isonitrosomalono derivatives gives access to 5-dialkylamino-1, 1-dicyano 2-aza-1,3-dienes (or 1-methoxycarbonyl analogous) which are precursors of various regiospecific 5,6-substituted 2-amino-3-cyano (or methoxycarbonyl) pyrazines. Some examples of utilisation of these intermediates for synthesis of lumazines, pteridines, and other bicyclic skeletons are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690406
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  • 10
    Electronic Resource
    Electronic Resource
    2-Aza-l, 3-dienes. Partie 6. Observation d′un effet ‘tert-amino’ dans le traitement acide de (pyrrolidin-l-yl)-azadienes (1990)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 73 (1990), S. 1210-1214 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ‘tert-Amino Effect’ on Acidic Treatment of (Pyrrolidin-l-yl)azadienesThe behaviour of 4-morpholino- and 4-(pyrrolidin-l-yl)-2-aza-1. 3-diene-l, l-dicarbonitriles 3, and 4 and 10, respectively, in acidic medium is described. The former gives with HBr/AcOH 3-bromopyrazine-2-carbonitrile 6. On the other hand, pyrrolidin-1-yl derivatives 4 and 10 furnish, by a [1, 5]-H shift, pyrrolo[l, 2]pyrazine structures 5 and 11, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19900730509
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