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  • Inorganic Chemistry  (3)
  • Aziridines, regioselectivity of ring opening
  • 1990-1994  (2)
  • 1970-1974  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2870-2886 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction with Aziridines, XI. Reactions of 1-Acylaziridines with Alkoxides and PhenoxidesThe 1-acylaziridines 1a, c, and d react with alcohols and phenols in the presence of alkoxides to form N-acylated colamine ethers (3, 4a-g, 5, 7a-h, 8). Treatment of 1d with primary alcohols or with phenols in the presence of suitable base concentrations produces the corresponding ethers in good yields, whereas upon treatment of 1d with α-branched alcohols diphenylamine is split from 1d in a side reaction. o-Substituents of the reacting phenols influence the course of the reaction only if they exert an extreme shielding effect. With 1a and c splitting off of aziridine as a side reaction is apparently inevitable, but it can be suppressed somewhat by high concentration of alkoxide in the reaction of 1c. Reaction of 1c with phenol in the presence of catalytic amounts of alkoxide yields the colamine ether 6 in a further side reaction.
    Notes: Die 1-Acylaziridine 1a, c und d bilden mit Alkoholen und Phenolen bei Zusatz von Alkoholat N-acylierte Colaminäther (3, 4a-g, 5, 7a-h, 8). 1d liefert bei geeigneter Basenkonzentration mit primären Alkoholen und mit Phenolen die entsprechenden Äther in guten Ausbeuten, mit α-verzweigten Alkoholen wird in einer Nebenreaktion aus 1d Diphenylamin abgespalten, während o-Substituenten der Phenole nur bei extremer Abschirmwirkung einen Einfluß auf die Produktbildung ausüben. Bei 1a und c ist als Nebenreaktion die Abspaltung von Aziridin anscheinend unvermeidlich, bei der Umsetzung von 1c mit Alkohol jedoch durch hohe Alkoholatkonzentration etwas unterdrückbar. Die Umsetzung von 1c mit Phenol ergibt bei katalytischer Menge Alkoholat in einer weiteren Nebenreaktion den Colaminäther 6.
    Additional Material: 5 Tab.
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  • 2
    ISSN: 0009-2940
    Keywords: Single-electron transfer vs. carbonyl attack ; Tetrahydrobianthracene, disproportionation of ; Radical combination ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Arene Hydrides, 8. - SET vs. Nucleophilic Attack in Reactions of α-Bromoisobutyrophenone with Carbanions. Fragmentation of the Anion of TetrahydrobianthraceneSET is the main reaction pathway between α-bromoisobutyrophenone (1) and the carbanions 7a-j- of diarylmethanes or disubstituted acetonitriles: 7- → 7. + e and e + 1 →→ Br- PhCOCMe.2 (3). Main secondary reactions are dimerization of the radical 7. (to form 6) and further reduction of 3: 7- + 3 → 7. + 4 [enolate of isobutyrophenone (5)]. Occasionally substitution products (9) of 1 are obtained. They are probably formed by combination of 7. with 3 (0% 9e at room temperature, 38% 9e at -65°C). This combination seems to be favored by cation coordination. In the reaction with 7f- (“anthracene hydride”) the dimer 6f (and probably 9f, too) undergoes fragmentation to form anthracene. The epoxide 16, arising from 1 by carbonyl attack, has been found only once with 7a-j-; (1% 16b). In contrast, 16 was the (elusive) main product in the reaction of 1 with the carbanions 7k-n- of monosubstituted acetonitriles. Here, 6 and 9 have been found only once (61, 9n). The elusive 16k-n underwent eliminative ring fission.
    Additional Material: 2 Tab.
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  • 3
    ISSN: 0009-2940
    Keywords: Dihydroanthracene, benzylated ; Fragmentation ; Anthracenide Anthracene hydride ; Aziridines ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of the title compound 1 with anthracene hydride AH- or anthracenide A-' leads to the formation of the ben- zylic anion 9 by fragmentation of the first generated substi- tution intermediate 7 or 8. In the reactions with AH- the carb- anion 9 is completely trapped by protonation with dihydroan- thracene AH2 yielding the reduction product 3 (N-benzoyl-phenethylamine).phenethylamine). In reactions with A-' as well as with naph- thalenide N-' the carbanion 9 either abstracts a proton from the solvent THF (yielding 3) or adds to the benzoyl group of unreacted 1 which finally results in P-benzamido-ct-phenyl- propiophenone (6).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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