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  • 1
    Electronic Resource
    Electronic Resource
    α-CH-Acidität von Allyliden-Komplexen: Rheniumorganische Derivate des 1,2,3-Butatriens durch Dehydrochlorierung von Rhena(V)-allylidenen. Synthese und Strukturchemie (1989)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 122 (1989), S. 2035-2040 
    Details
    ISSN: 0009-2940
    Keywords: CH Acidity ; Rhenium complexes ; Allylidene ; Butatriene ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: α-CH Acidity of Allylidene Complexes: Organorhenium Derivatives of 1,2,3-Butatriene by Dehydrochlorination of Rhena(V) Allylidenes. Synthesis and StructureThe rhena(V) allylidene complex (η5-C5Me5)ReCl2 [η1:η3-(CH3)-CC(Cl)CH2] (2) is quantitatively converted into the novel organorhenium 1,2,3-butatriene derivative (η5-C5Me5)ReCl2[η3-H2CC(C5H5N)CCH2] (3) by lithium hydroxide in the presence of excess pyridine. This result shows so far not investigated CH acidity of methyl groups, that are substituting π-bonded allylidene frameworks at the α-position. According to an X-ray structure analysis, the coordination geometry of the 1,2,3-butatriene ligand is very similar to related allyl complexes of the (η5-C5Me5)ReCl2 fragment.
    Notes: Der Rhena(V)-allyliden-Komplex (η5-C5Me5)ReCl2 [η1:η3-(CH3)-CC(Cl)CH2] (2) wird durch Lithiumhydroxid in Gegenwart von überschüssigem Pyridin quantitativ zu dem neuartigen rhenium-organischen 1,2,3-Butatrien-Derivat (η5-C5Me5)ReCl2[η3-H2CC(C5H5N)CCH2] (3) dehydrohalogeniert. Dieses Ergebnis weist auf die bisher nicht beachtete CH-Acidität von Methylgruppen hin, die ein π-gebundenes Allyliden-Gerüst α-ständig substituieren. Einer Röntgenstrukturanalyse zufolge ist der von 1,2,3-Butatrien abgeleitete Ligand allylartig an das (η5-C5Me5)ReCl2-Fragment gebunden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19891221102
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  • 2
    Electronic Resource
    Electronic Resource
    Darstellung des Triphenylmethans (1881)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 14 (1881), S. 1942-1944 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.18810140291
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Kentniss des Rosanilins (1880)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 13 (1880), S. 2204-2207 
    Details
    ISSN: 0365-9496
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.188001302233
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  • 4
    Electronic Resource
    Electronic Resource
    Karpoxanthin und 6-Epikarpoxanthin (1985)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 68 (1985), S. 1704-1707 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Karpoxanthin and 6-EpikarpoxanthinA tetrahydroxy-β,β-carotene previously isolated in minute amounts from ripe hips of Rosa pomifera was now identified as (3S,5R,6R,3′R)-5,6-dihydro-β,β-carotene-3,5,6,3′-tetrol (2). Acid hydrolysis of (9Z)-antheraxanthin (3) gave 2 and its C(6)-epimer 4. Tetrol 2 is named karpoxanthin.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19850680626
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  • 5
    Electronic Resource
    Electronic Resource
    Das Carotinoidspektrum der Antheren und Petalen von Lilium tigrinum cv. ‘Red Night’ (1985)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 68 (1985), S. 1708-1715 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carotenoids from Anthers and Petals of Lilium tigrinum cv. ‘Red Night’Amongst the 29 carotenoids separated and characterized by modern methods the following are worth mentioning: (9′Z)-, (9Z)-, (13′Z)- und (13Z)-capsanthins (20-23), the novel 6-epikarpoxanthin (= (3S,5R,6S,3′R)-5,6-dihydro-β,β-carotene-3,5,6,3′-tetrol; 25), karpoxanthin (= (3S,5R,6R,3′R)-5,6-dihydro-β,β-carotene-3,5,6,3′-tetrol; 28), and lilixanthin (= (3S,4S,3′S,5′R)-3,4,3′-trihydroxy-β,κ-carotene-6′-one; 26). The main carotenoids from the petals, in comparison with those of the anthers, represent a more advanced metabolic state.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19850680627
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  • 6
    Electronic Resource
    Electronic Resource
    Die toxischen und sedierend wirkenden Bufadienolide von Kalanchoedaigremontiana HAMETet PERR (1986)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 69 (1986), S. 359-367 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The Toxic and Sedative Bufadienolides of Kalanchoe daigremontiana HAMET et PERR.From the toxic Crassulacee Kalanchoe daigremontiana five biosynthetically related bufadienolides have been isolated and structurally elucidated by X-ray and 1H- and 13C-NMR spectroscopy. The compounds were identified as bersaldegenin 1,3,5-orthoacetate (2), bersaldegenin 1-acetate (4), bersaldegenin 3-acetate (3), 1β,3β,5,11α,14-pentahydroxy-12,19-dioxo-5β,14β-bufa-20,22-dienolide 1,3,5-orthoacetate ( = daigremontianin; 1), and 3β-acetoxy-1β,5,14-trihydroxy-5β,14β-bufa-20,22-dienolide ( = daigredorigenin-3-acetate, 5). According to the pharmacological investigations, the two orthoacetates 1 and 2 comprise the positive inotropic, sedative, and toxic activity of the plant.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19860690215
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  • 7
    Electronic Resource
    Electronic Resource
    Die stereoisomeren Sinensiaxanthine und Sinensiachrome: Trennung und Bestimmung ihrer absoluten Konfiguration. 7. Mitteilung über Rosenfarbstoffe6. Mitteilung, s. [1]. (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 24-30 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Stereoisomeric Sinensiaxanthins and Sinensiachromes: Separation and Absolute ConfigurationThe so-called sinensiaxanthins and sinensiachromes, important apocarotenols from various fruits, have been separated into 2 and 4 stereoisomers, respectively, and their absolute configurations have been determined: (3S,5R,6S)-5,6-epoxy-5,6-dihydro-10′-apo-β-carotene-3,10′-diol (2), its (9Z)-stereoisomer 7, the (8R)- and (8S)-epimers of (3S, 5R)-5,8-epoxy-5,8-dihydro- 10′ -apo-β-carotene-3, 10′-diol (4 and 5), and their (9Z)-stereoisomers 3 and probably 6. Thus, sinensiaxanthins are cleavage products from (Z/E)-isomeric antheraxanthins or violaxanthins (scission at C(9′)-C(10′)) and sinensiachromes analogously from mutatoxanthins or auroxanthins.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710103
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  • 8
    Electronic Resource
    Electronic Resource
    Complexes of 3,3′-Oxybis[(diphenylphosphino)methylbenzene] with Ni(II), Pd(II), Pt(II), Rh(I), and Ag(I). How Important is Backbone Rigidity in the Formation of trans-Spanning Bidenatate Chelates?? (1987)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 158-170 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The bidentate diphosphine ligand, 3,3′-oxybis[(dipenylphosphino)methylbenzene] (1) forms monomeric, trans-square-planar complexes MX2(1) (M = Ni, Pd, Pt; X = Cl-, Br- I-, and, in part, N3-, NCS-, CN-, NO3-) as well as Pt(H)Cl(1), Pt(H)Br(1), and RhCl(CO)(1). Polymeric species have been observed with substitutionally inert metal centres: trans-[PtCl2(1)]2 and cis-[PtCl2(1)]n (mean value of n ≈ 4-5) 31P-NMR, and selected IR and UV/VIS parameters are reported. Ligand 1 shows a marked preference for trans-spanning and monomeric chelate formation, despite its various degrees of freedom of internal rotation in the lignad backbone. The readily available ligand 1 as well as analogues with other donor atoms, therefore, appear useful in most potential applications of trans-spanning chelate ligands. The crystal structure of AgCl(1)·0.5 (CH3)2C=O·0.39 C6H12 (space group C2/c,a = 21.02 Å, b = 14.57 Å, c = 24.79 Å, β = 99.77°, V = 7531.4 Å3, Z = 8) confirms the presence of three-coordinate Ag(I), with a coordination intermediate between a trigonal-planar and a T-shaped geometry (P-Ag-P = 145.61(8)°).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19870700120
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  • 9
    Electronic Resource
    Electronic Resource
    Isolierung von 10′-Apo-β-carotin-10′-ol und (3R)-10′-Apo-β-carotin-3,10′-diol (Galloxanthin) aus Rosenblüten. 5. Mitteilung über Rosenfarbstoffe1. bis 4. Mitt., s. [1-4]. (1987)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 70 (1987), S. 1988-1993 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Isolation of 10′-Apo-β-carotene-10′-ol and (3R)-10′-Apo-β-carotene-3,10′-diol (Galloxanthin) from Rose FlowersThe novel (all-E)-10′-apol-β-carotene-10′-ol (2) and (all-E,3R)-10′-apo-β-carotene-3,10′-diol (5) have been isolated from petals of one yellow species and various whitish or yellow blend varieties of rose cultivars. Each (all-E)-compound is accompanied by a (Z)-isomer, probably the (9Z)-isomer. Diol 5 proved to be identical with galloxanthin, an apo-10′-carotenol previously isolated from the retina of chicken.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19870700803
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  • 10
    Electronic Resource
    Electronic Resource
    Rosafluin, ein neues Diapocarotindiol aus Rosenblüten. 8. Mitteilung über Rosenfarbstoffe7. Mitteilung: [1]. (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 1491-1497 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rosafluine, a Novel Diapocarotenediol from Rose PetalsA strongly fluorescent trace compound from rose petals was identified as the as yet unknown 10,10′-diapocarotene-10,10′-diol ( = 4,9-dimethyldodeca-2,4,6,8,10-pentaene-1,12-diol; 2).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710613
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