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Digitale Medien

Masthead (1982)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982)

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650101

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Digitale Medien

Stoffwechselprodukte von Mikroorganismen. 210. Mitteilung.209.Mitt. s. [1]. Über die Avilurekanosen A and C and weitere Abbauprodukte Avilamycine A and C (1982)

Kupfer, Ernst ; Neupert-Laves, Katarina ; Dobler, Max ; [weitere]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 3-12

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The Avileurekanoses A and C and Further Degradation Products of the Avilamycins A and CAlkaline hydrolysis of the orthosomycin antibiotics, avilamycins A ad C products similar t those earlier described for flambamycin. Among these avileurekanose c (15) became of particular importance because its acetate prisms suitable for an X-ray structural determination. For the avilamycins A and C structural formulae 2 and 3, respectively, can now be drawn, in which only the configuration at C (16), one out of 32 asymmetric C-atoms, is not yet determined.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650103

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Digitale Medien

Transition metal ions and amides. VIII.Part VIII, see [1]; Part VI, see [2]. Discrimination between different models for the complexation of Cu2+ with N, N′-diglycyl 1, 2-ethanediamine, N, N′-diglycyl-1, 3-propanediamine and glycine ethylamide by potentiometric or by spectrophotometric titration (1982)

Briellmann, Markus ; Zuberbühler, Andreas D.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 46-54

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The complexation of Cue2+ with 1, 8-diamino-3, 6-diaza-2, 7-octanedione (—N, N′-diglycyl-1, 2-ethanediamine, DED) and with 1, 9-diamino-3, 7-diaza-2, 8nonanedione (—N, N′-diglycyl-1, 3-propanediamine, DPD) has been studied by potentiometric and by spectrophotometric titration. With both ligands L the complexation to Cue2+ leads to relatively complicated equilibria with CuLH3+, CuL2+, CuLH-2, and dimeric Cu2L24+ complexes. With DED, another dimeric species, Cu2L2H-22+, is formed in addition. Independent numerical treatment of spectrophotometric and poteritiometric titrations was used to obtain a satisfactory model for the complexation and to test the relative discriminatory power of the two methods. Titrations of glycine ethylamide (GEA) were used as an additional test and as a model for DED and DPD. It was shown that in each case spectrophotometric titrations give results of similar reproducibility and have a discriminatory power equal to or better than potentiometric titrations, provided that optimum mathematical algorithms are used in the numerical treatment.

Zusätzliches Material: 3 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650106

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Digitale Medien

Heterocyclische und carbocyclische 12-π- and 14-π-Molekü:lsysteme, 47. Mitteilung46. Mitt. s.[1]. Herstellung von 7, 9-Dimethyl-4, 5-dihydro-3 H-benz [cd]- azulen-3-on and 7,9-Dimethyl-3H-benz [cd]azulen-3-on. Eine einfache Synthese eines AzulenopseudophenalenonsTeilweise vorgetragen von R. Neidlein 1980 an den Departments of Chemistry der Universitäten Berkeley/Calif., Cambridge/Mass. (Harvard-Universität), Cambridge (England), East-Anglia/Norwich, Erlangen (Institut für Angewandte Chemie), Haifa (1978), Houston/Texas, Jerusalem (1978), Imperial Chemical Industries Ltd., Manchester, London (University College, Chelsea College), Manchester (Institute of Science and Technology), Oxford (England), Salford, Tübingen. (1982)

Neidlein, Richard ; Kramer, Walter

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 280-285

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Heterocyclic and Carbocyclic 12-π-and 14-π-Systems, 47th Commnunication1. Synthesis of 7,9-Dimethyl-4,5-dihydro-3H-benz[cd]azualene-3-one and 7,9-Dimethyl-3H-benz[cd]azulene-3-one. A Simple Synthesis of Azulenopseudophenalenons4, 6, 8-Trimethylazulene (3) reacts after metalation with lithiumdiisopropyl-amide in ether with bromoacetic acid to the 6, 8-dimethylaltulene-4-propionic acid (4), which undergoes cyclization to the 7, 9-dimethyl-4, 5-dihydro-3H-benz [cd]-azulene-3-one (5) in the presence of p-toluenesulfonic acid; oxidation of 5 with 2, 3-dichloro-5, 6-dicyanobenzoquinone yields 7, 9-dimethyl-3H-benz [cd]azulene-3--one (1b). Alkylation of 1b with triethyloxonium tetrafluoroborate in CH2C12 gives the 3-ethoxy [cd]benzazulenium tetrafluoroborate (6).

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650129

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5

Digitale Medien

On the Absolute Configuration of Indane-1-carboxylic Acid (1982)

Brewster, James H.

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 317-324

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Doubts that have recently been expressed [1] about the currently accepted (+)-(R), (-)-(S) [2] absolute configuration of indane-1-carboxylic acid appear to be unwarranted. Our ORD. values for 1-methylindane [12] are in error.

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650134

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6

Digitale Medien

Synthese von [16,16,16,16′,16′,16′-2H6] Lycopin (1982)

Hofer, Arnold ; Eugster, Conrad Hans

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 365-370

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Synthesis of [16,16,16,16′,16′,16′ 2H6]LycopeneLycopene having at both ends the deuteriated methyl groups trans to the chain has been synthesized for further biochemical experiments aimed to elucidate the stereochemistry of the cyclization step.Incidentally a gas-chromatographic separation of the isotopisomers 1 and 2g has been observed.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650138

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Digitale Medien

Masthead (1982)

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982)

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650201

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8

Digitale Medien

d5-Reactions of Doubly Deprotonated γ,δ-Unsaturated Carbonyl Derivatives with Electrophiles. A Novel Approach to the Synthesis of Tetrahydrofuran and Tetrahydropyran DerivativesSee also the preceding papers([1] and earlier).For short communications see [2] in [1]. (1982)

Seebach, Dieter ; Pohmakotr, Manat ; Schregenberger, Christian ; [weitere]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 419-450

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: The dienone-dianion derivatives 1 react with all types of electrophiles tested (alkyl halide, silyl chloride, ester, ketone, aldehyde, epoxide) to give β, γ-unsaturated carbonyl compounds of type A (see Formulae 2-6, 13, 14 and Tables 1-5). The α- and β-hydroxyalkylation products obtained from 1a-1d can be converted to tetra-hydrofuran and tetrahydropyran derivatives 7 and 16, respectively (Tables 1 and 2), those from the sulfur analogues 1e and 1f to ketene thioacetals 9 and to dienone derivatives 10 and 12. The t-butyl and α-hydroxy-ketones are cleaved to give nitriles, amides, carboxylic acids and esters (Formulae 16-25). The reagents 1 allow to synthesize products with distant functional groups in one step (cf. 1,8-diketones 14 and Formulae 26-30); they correspond to the d5-synthons 31-33; in Table 6, they are compared with other d5-reagents.

Zusätzliches Material: 6 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650202

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Digitale Medien

Synthesis of Methyl 2-Acetamido-4,6-di-O-acetyl-3-S-acetyl-2-deoxy-3-thio-α-D-mannopyranosidePart VI. of neighboring-group participation in carbohydrate chemistry. For Part V see [1]. (1982)

Miljković, Momčilo ; Hagel, Peter

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 477-482

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Methyl-2-acetamido-4,6-di-O-acetyl-3-S-acetyl-2-deoxy-3-thio-α-D-mannopy-ranoside has been synthesized by conversion of methyl 2-amino-2-deoxy-4,6-O-benzylidene-α-D-altropyranoside into the corresponding 3-O-methanesulfony1-2-N-[(methylthio)thiocarbonyl]derivative followed by intramolecular displacement of the 3-O-methanesulfonyloxy group with the (methylthio)thiocarbamoyl group.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650205

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Digitale Medien

(Perhalogenmethylthio)heterocyclen. XIIXI, Mitt., s.[1]. Herstellung von Perfluoroalkylsulfonylharnstoff-Derivaten sowie CCl3-nFnX-substituierten Heterocyclen und deren biologische Wirkung (1982)

Gerstenberger, Michael R. C. ; Haas, Alois ; Pauling, Horst

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 65 (1982), S. 490-494

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: (Perhalomethylthio)heterocycles XII. Preparation of Perfluoroalkylsulfonylurea Derivatives as well as CCl3-nFnX-Substituted Heterocycles and Their Biological ActivityXI, Mitt., s.[1]In the presence of CF3SO3H (chlorodifluoromethylthio)thiophene 1 reacts with CClF2SCl to give the 2,5-disubstituted thiophene 2a which on oxidation with 30% H2O2-solution yields the corresponding sulfonyl compound 2b · R1SO2NCO adds amines to give R1SO2NHC(O)NHR 3a-g. Some biological properties of these compounds were investigated.

Zusätzliches Material: 2 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19820650207

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