ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

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Nucleophilic Substitution Reactions with the 3-Borane-1,4,5-trimethylimidazol-2-ylidene Anion. - Unexpected Formation of an Imidazabole Isomer (1999)

Wacker, Andreas ; Pritzkow, Hans ; Siebert, Walter

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 789-793

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ISSN: 1434-1948

Keywords: Boranes ; Carbenes ; Heterocycles ; Imidazoles ; X-ray structures ; Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The nucleophilic carbene 3-borane-1,4,5-trimethylimidazol-2-ylidene anion (1-) reacts with the electrophiles CH3I, (CH3)3SiCl, (CH3)3SnCl, and the bromodiazaboroline 7 to form the 2-substituted imidazoles 4, 5, 6, and 8. With triethylborane, the anionic carbene borane adduct 9- is obtained. An unexpected result was achieved when chlorodimethoxyborane and HBCl2 · S(CH3)2 were used as electrophiles. In both cases only the imidazabole 14a could be isolated. Imidazole 5, the imidazole borane adduct 3a and the imidazabole 14a were characterized by X-ray structure analyses.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

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2

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Borane-Substituted Imidazol-2-ylidenes: Syntheses, Structures, and Reactivity⋆ (1998)

Wacker, Andreas ; Pritzkow, Hans ; Siebert, Walter

Weinheim : Wiley-Blackwell

Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 843-849

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ISSN: 1434-1948

Keywords: Boranes ; Carbenes ; Carbene complexes ; Heterocycles ; Imidazoles ; Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Reactions of the Lewis acids BH3 and BEt3 with trimethylimidazole (1) lead to the borane adducts 2a and 2b. Deprotonation of 2a with n-butyllithium results in the formation of the novel N-borane-substituted imidazol-2-ylidene anion 3a- whereas deprotonated 2b rearranges unexpectedly to the anionic compound 3b-. This can be transformed into the carbene-borane adduct 4 by methylation. The reaction of 3a- with [Mn(CO)5Br] yields the carbene complex 5. Surprisingly, 3a- attacks Fe(CO)5 at a carbon atom which leads to the iron acyl complex anion 6-. The compositions of the products follow from spectroscopic and analytical data and from X-ray structure analyses for Li(thp)+3a-, Li(thf)2+3b- and Li(thp)3+6-.

Type of Medium: Electronic Resource

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3

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Wirkung von UV-Licht bei der Polyphenylalanin-Biosynthese (1962)

Wacker, A. ; Jacherts, D. ; Jacherts, Blanda

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 74 (1962), S. 653-653

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 1 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19620741617

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4

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Metalle in Tabakmosaikvirus-Ribonucleinsäure (1962)

Wacker, W. ; Gordon, M. ; Huff, J.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 74 (1962), S. 36-36

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19620740133

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5

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Zur wirtschaftlichen Gewinnung von Atomenergie Aus einem USA-Gutachten (1954)

Wacker, A. ; Grisebach, H.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 66 (1954), S. 99-102

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Die bei der Spaltung des Urans freiwerdende Wärme kann zur elektrischen Energieerzeugung oder zum Antrieb von Motoren ausgenützt werden. Die zu diesem Zweck vorgeschlagenen Reaktortypen werden besprochen.

Additional Material: 3 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19540660404

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6

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Strahlenchemische Veränderung von Pyrimidin-ribosiden und Pyrimidinen (1961)

Wacker, Adolf ; Träger, Lothar ; Weinblum, Dieter

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 73 (1961), S. 65-65

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19610730211

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7

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Über die Biogenese des Leucopterins (1961)

Weygand, F. ; Simon, H. ; Dahms, G. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 73 (1961), S. 402-407

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: Durch Applikation 14C-markierter Vorläufer an die Raupen oder Puppen von Pieris brassicae L. (Kohlweißling) und Abbau des von den Schmetterlingsflügeln isolierten Leucopterins wurde die Herkunft der Kohlenstoff-Atome des Pterins ermittelt. Die C-Atome 2, 4, 5 und 6 werden aus denselben Vorläufern wie die entspr. C-Atome des Guanins gebildet. Die C-Atome 8 und 9 stammen aus einer Pentose. Durch Vergleich der 14C-Verteilung und der spez. Aktivität von Guanin und Leucopterin wird der Übergang von Guanin in Leucopterin sehr wahrscheinlich gemacht.

Additional Material: 1 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19610731111

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8

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Der Wirkungsmechanismus der Sulfonamide (1954)

Wacker, Adolf ; Grisebach, H. ; Trebst, A. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 66 (1954), S. 326-326

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19540661204

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9

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The Chemistry and Biology of Purines. A Ciba Foundation Symposium, herausgeg. von G. E. W. Wolstenholme und C. M. O'Connor. J. & A. Churchill Ltd., London 1957. 1. Aufl., XII, 327 S., 124 Abb., geb. £ 0.48.0 (1958)

Wacker, A.

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 70 (1958), S. 36-36

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19580700116

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10

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Einfluß von Steroiden auf die Aktivität der DNS-abhängigen RNS-Polymerase (1965)

Wacker, A. ; Drews, J. ; Pratt, W. B. ; [et al.]

Weinheim : Wiley-Blackwell

Zeitschrift für die chemische Industrie 77 (1965), S. 172-172

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ISSN: 0044-8249

Keywords: Chemistry ; General Chemistry

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Additional Material: 2 Tab.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/ange.19650770412

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