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1

Digitale Medien

The third asymptotic distribution of largest magnitudes in the Balkan earthquake provinces (1978)

Schenková, Zdeňka ; Kárník, Vít

Springer

Pure and applied geophysics 116 (1978), S. 1314-1325

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ISSN: 1420-9136

Schlagwort(e): Seismicity ; Seismic risk ; Earthquake statistics ; Theory of largest values ; Balkan, seismicity of

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Summary The third asymptotic distribution of the theory of largest values is applied to sixteen earthquake provinces in the Balkan area. The model which assumes an upper magnitude limit fits the observations better than the first distribution. Graphs and tables provide estimates of return periods of largest magnitudes.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00874690

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2

Digitale Medien

Anomalous seismicity prior to rock bursts: Implications for earthquake prediction (1977)

Brady, B. T.

Springer

Pure and applied geophysics 115 (1977), S. 357-374

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ISSN: 1420-9136

Schlagwort(e): Seismicity ; Earthquake prediction ; Stressin-situ

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Abstract Anomalous seismicity changes (increase followed by a decrease) were recorded prior to three moderate rock bursts in the Star mine, Burke, Idaho. In each case, based upon the anomalous seismicity behavior, miners were evacuated or were prohibited from entering active mine stopes that were located in the immediate vicinity of the seismicity buildup prior to the bursts. Analyses of pre- and post-seismic activity are interpreted in terms of, and shown to be consistent with, the inclusion theory of failure. Implications of these observational results for the problem of rock bursts and earthquake prediction are discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01637114

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3

Digitale Medien

Seismicity gap near Oaxaca, southern Mexico as a probable precursor to a large earthquake (1977)

Ohtake, Masakazu ; Matumoto, Tosimatu ; Latham, Gary V.

Springer

Pure and applied geophysics 115 (1977), S. 375-385

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ISSN: 1420-9136

Schlagwort(e): Seismicity ; Earthquake prediction

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Summary An area of significant seismic quiescence is found near Oaxaca, southern Mexico. The anomalous area may be the site of a future large earthquake as many cases so far reported were. This conjecture is justified by study of past seismicity changes in the Oaxaca region. An interval of reduced seismicity, followed by a renewal of activity, preceded both the recent large events of 1965 and 1968. Those past earthquakes have ruptured the eastern and western portions of the present seismicity gap, respectively, so that the central part remaining is considered to be of the highest risk of the pending earthquake. The most probable estimates are: 7 1/2±1/4 for the magnitude and ϕ=16.5°±0.5°N, λ=96.5°±0.5W for the epicenter location. A firm prediction of the occurrence time is not attempted. However, a resumption of seismic activity in the Oaxaca region may precede a main shock.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01637115

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4

Digitale Medien

The Synthesis of [4-Carboranylalanine, 5-Leucine]-Enkephalin (Including an Improved Preparation of t-Butoxycarbonyl-L-o-carboranylalnine, New Derivatives of L-Propargylglycine, and a Note on Melanotropic and Opiate Receptor Binding Characteristics)This work was supported by research grants of the Swiss National Science Foundation and the Swiss Federal Institute of Technology. Abbreviations are according to the IUPAC-IUB Commission on Biochemical Nomenclature [1] and Houben-Weyl [2]: Car represents L-propargylglycine is and Pra L-propargylglycine. A former statement in the summary of [3] that L-propargylglycine is a new amino acid is incorrect; only its derivatives with protecting groups suitable for peptide synthesis were new. The free amino acid had been described earlier as the racemate [4] and as the individual enantiomers [5]. (1979)

Fauchère, Jean-Luc ; Leukart, Othmar ; Eberle, Alex ; [weitere]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1385-1395

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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 title compound, an analogue of [Leu5]-enkephalin with L-o-carboranylalanine replacing L-phenylalanine in position 4, was prepared by fragment condensation. The analogue has a 3-fold higher affinity for rat brain opiate receptors in the [3H]naloxone competition assay than natural [Leu5]-enkephalin. Like [Leu5]-enkephalin and Na-acetyl-[Leu5]-enkephalin, the N-terminal tripeptide fragment, H · Tyr-Gly-Gly · OH, had no melanotropic activity in the Rana pipiens frog skin assay.A convenient, direct synthesis of methyl t-butoxycarbonyl-L-propargylglycinate is described, and the 13C-NMR. spectra of L-o-carboranylalanine recorded. The procedure was extended to the preparation of BOC · Car-Leu · OMe from BOC · Pra-Leu · OMe. A number of new propargylglycine derivatives are reported.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620502

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5

Digitale Medien

Phenylselenoacetaldehyde, a Useful Reagent for the Homologative Conversion of Halides to Phenylselenomethyl KetonesDedicated to Professor Edgardo Giovannini on his 70th anniversary (1979)

Baudat, Roger ; Petrzilka, Martin

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1406-1410

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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 conversion of primary, secondary and vinylic halides to the two C-atoms homologated phenylselenomethyl ketones 8 is described. The method involves addition of the readily available phenylselenoacetaldehyde 5 to the Grignard reagents 9 and oxidation of the resulting β-hydroxy-selenides 10 (Scheme 3).

Zusätzliches Material: 1 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620505

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6

Digitale Medien

Anil-Synthese. 20. Mitteilung19. Mitt. siehe [1].. Über die Herstellung von Stilbenyl-Derivaten des 1,2,4,-OxadiazolsHerrn Professor Dr. Dr. h.c. Edgardo Giovannini zum 70. Geburtstag gewidmet (1979)

Berger, Hanny ; Siegrist, Adolf Emil

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1411-1428

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Preparation of Stilbenyl Derivatives of 1,2,4-OxadiazolesSchiffs bases derived from 3- and 5-(p-formylphenyl)-phenyl-1,2,4-oxadiazoles and chloroanilines are reacted with various p-tolyl substituted aromatic heterocycles in the presence of dimethylformamide and potassium hydroxide to yield the corresponding heterocyclic substituted stilbenes (‘Anil synthesis’). The reactivity of 5-[4-(chlorophenylimino-methyl)phenyl]-3-phenyl-1,2,4-oxadiazoles is very low and side reactions will predominate.

Zusätzliches Material: 1 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620506

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7

Digitale Medien

(Perhalogenmethylthio)heterocyclen. XIX. Mitt.: s. [1].. Säurekatalysierte Substitutionen an (Perchlorfluormethylthio)pyrrolen und deren agrobiologische Wirkung (1979)

Dorn, Silvia ; Eggenberg, Peter ; Gerstenberger, Michael R. C. ; [weitere]

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1442-1450

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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. XIX. Mitt.: s. [1]. . Acid-catalyzed substitutions on (perchlorofluoromethylthio)pyrroles and their agro-biological activitiesIn the presence of C4F9SO3H the (perhalomethylthio)pyrroles 1a-c react with Cl3-nFnCSCl (n = 1-3) to give mixtures of the 2,5- and 2,4-disubstituted pyrroles 2a-f and 3a-h. 2a and 3a react with CF3SCl (catalyst CF3SO3H) yielding 2,3,5-tris (trifloromethylthio)pyrrole (4a), which under similar conditions reacts further to give 2,3,4,5-tetrakis (trifluoromethylthio)pyrrole (5). As a by-product during the conversion of 3a to 4a 2,3,4-tris (trifluoromethylthio)pyrrole (4b) is formed. The pyrroles 2a, 4a and 5 form the mercury salts 6a-c; compound 5 yields also a silver salt 7. The 1H- and 19F-NMR. spectra are discussed and the agro-biological properties of the compounds investigated.

Zusätzliches Material: 4 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620508

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8

Digitale Medien

Nouvelle méthode de préparation d'éthers vinyliques à partir d'acétals (1979)

Barbot, Francis ; Miginiac, Philippe

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1451-1457

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A new way to vinylic ethers from acetalsAcetals react at low temperatures in presence of a Lewis acid (aluminium chloride or magnesium bromide) with tertiary amine to give in good yields the vinylic ethers corresponding to the elimination of one molecule of alcohol.

Zusätzliches Material: 4 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620509

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9

Digitale Medien

Additionsreaktionen von 3-Dimethylamino-2,2-dimethyl-2H-azirin an Phenylisocyanat und DiphenylketenHerrn Prof. Dr. Dr. h.c. Edgardo Giovannini zum 70. Geburtstag gewidmet (1979)

Mukherjee-Müller, Gabriele ; Heimgartner, Heinz ; Schmid, Hans

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1429-1441

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Addition Reaction of 3-Dimethylamino-2,2-dimethyl-2H-azirine with Phenylisocyanate and Diphenylketene3-Dimethylamino-2,2-dimethyl-2H-azirine (1a) reacts with carbon disulfide and isothiocyanates with splitting of the azirine N(1), C(3)-double bond to give dipolar, fivemembered heterocyclic 1:1 adducts. In some cases, these products can undergo secondary reactions to yield 1:2 and 1:3 adducts. In this paper it is shown that the reaction of 1a with phenylisocyanate also takes place by cleavage of the N(1), C(3)-bond, whereas with diphenylketene N(1), C(2)-splitting is observed.The reaction of 1a and phenylisocyanate in hexane at room temperature yields the 1:3 adduct 2 in addition to the trimeric isocyanate 3 (Scheme 1). A mechanism for the formation of 2 is given in Scheme 5. Hydrolysis experiments with the 1:3 adduct 2, yielding the hydantoins 4-6 and the ureas 7 and 8 (Schemes 3 and 5), show that the formation of this adduct via the intermediates d, e and f is a reversible reaction.The aminoazirines 1a and 1b undergo an addition reaction with diphenylketene to give the 3-oxazolines 14 (Scheme 8), the structure of which has been established by spectral data and oxidative degradation of 14a to the 3-oxazolin-2-one 15 (R1 — R2 — CH3, Scheme 9).

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620507

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10

Digitale Medien

1H-NMR.-spektroskopische Analyse von prochiralen Allencarbonsäureestern mit optisch aktiven Europium-VerschiebungsreagenzienHerrn Prof. Dr. Dr. h. c. Edgardo Giovannini, in Verehrung zum 70. Geburtstag gewidmet (1979)

Lang, Robert W. ; Hansen, Hans-Jügen

New York, NY : Wiley-Blackwell

Helvetica Chimica Acta 62 (1979), S. 1458-1465

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ISSN: 0018-019X

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 1H-NMR. Spectroscopic Analysis of Prochiral Allenic Esters Using Optically Active Europium Shift ReagentsThe prochiral allenic methyl esters 1-4 (cf. Scheme) show in the presence of 1 mol-equiv. tris[3-(heptafluorobutyryl)-(+)-camphorato]europium (III) (Eu (hfc)3) in 1,1,2-trichloro-1,2,2-trifluoroethane (TCFE) induced unlike 1H-NMR. shift differences (ΔΔδ) for the enantiotopic protons and methyl groups on C(4), respectively (cf. Fig. 2 and 3). This effect allows to determine directly the 2JH,H coupling constants of the geminal protons on C(4) of the allenic esters 1 (15.5 Hz) and 2 (14.5 Hz) (cf. Table 2).

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/hlca.19790620510

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