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  • Wiley-Blackwell  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 2675-2680 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Polyfunctional Molecules, 78. Noradamantanes with the Heteroelements Arsenic, Oxygen, Sulfur, and SeleniumThe reduction of the heteroadamantane CH3C(CH2AsO)3 (1a) with an alkaline hypophosphite solution leads to the heteronoradamantane CH3C(CH2As)3O2 (2a) with CH3C(CH2As)3 (3) as a by-product. The homologous noradamantanes CH3(CH2As)3E2 (E = S, Se; 2b, c) result from the melting of 3 with elemental sulfur or selenium in the molar ration of 1 : 2. The oxidation of 3 with HgO or with an aqueous H2O2-solution does not lead to 2a. Instead the heteroadamantane 1a and the arsonic acid CH3C[CH2AsO(OH)2]3 (4), respectively, are formed.
    Notes: Durch Reduktion des Hetero-adamantans CH3C(CH2AsO)3 (1a) mit alkalischer Hypophosphitlösung erhält man das Hetero-noradamantan CH3C(CH2As)3O2 (2a) neben CH3C(CH2As)3 (3). Die homologen Noradamantane CH3C(CH2As)3E2 (E = S; Se; 2b, c) sind durch Zusammenschmelzen von 3 mit elementarem Schwefel oder Selen zugänglich. Versuche, 2a aus 3 durch Oxidation mit HgO oder H2O2 darzustellen, führten zu 1a bzw. CH3C[CH2AsO(OH)2]3 (4).
    Additional Material: 1 Tab.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4794-4805 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chemistry of Polyfunctional Molecules, 88. (Chloromethyl)tris[(diiodoarsino)methyl]methane and its Application for the Synthesis of Linear, Bicyclic, and Tricyclic Organo Arsenic CompoundsTetrakis(chloromethyl)methane, C(CH2Cl)4, reacts with NaAs(C6H5)2 (molar ratio 1:4) in liquid ammonia to give only the tritertiary arsane ClCH2C[CH2As(C6H5)2]3 (1). Treatment of 1 with gaseous HI in dry CH2Cl2 results in the formation of the iodoarsane ClCH2C-(CH2AsI2)3 (2) by selective cleavage of the phenyl as benzene. The hetero-adamantanes ClCH2C(CH2AsE)3 (E = O, S; 3a, b) are obtained on solvolysis of 2 with H2E (E = O, S). The reduction of 2 by sodium in THF under mild conditions yields the bicyclic compound ClCH2C(CH2As)3I2 (4), whereas the reduction in boiling THF forms the chloromethyl substituted nortricyclane derivative ClCH2C(CH2As)3 (5). The oxidative hydrolysis of 2 as well as of 3a with H2O2 gives the arsonic acid ClCH2C[CH2AsO(OH)2]3 (6). In contrast to the reduction of 2 with sodium in THF it is reduced in liquid ammonia also at the ClCH2 group to give CH3C(CH2As)3 (7), which is sublimed from the reaction mixture; the residue, after hydrolysing, contains 3a and the homologous CH3C(CH2AsO)3 (10).
    Notes: Tetrakis(chlormethyl)methan, C(CH2Cl)4 reagiert mit NaAs(C6H5)2(Molverhältnis 1:4) in flüssigem Ammoniak lediglich zum tritertiären Arsan ClCH2C[CH2As(C6H5)2]3 (1). Dieses setzt sich mit gasförmigem Iodwasserstoff in Dichlormethan unter selektiver Abspaltung der Phenylgruppen als Benzol zu (Chlormethyl)tris[(diiodarsino)methyl]methan, ClCH2C-(CH2AsI2)3 (2), um. Dessen Solvolyse mit H2E (E = O, S) ergibt die chlormethylsubstituierten Heteroadamantane ClCH2C(CH2AsE)3 (E = O, S; 3a, b). Die Reduktion von 2 mit Natrium in THF führt unter milden Reaktionsbedingungen zum Bicyclus ClCH2C(CH2As)3I2 (4), in siedendem THF dagegen zum chlormethylsubstituierten Nortricyclan-Derivat ClCH2C(CH2As)3 (5). Mit Wasserstoffperoxid reagieren 2 und 3a unter oxidativer Hydrolyse zur Arsonsäure ClCH2C[CH2AsO(OH)2]3 (6). Im Gegensatz zur Reduktion in THF wird 2 in flüssigem Ammoniak durch Natrium auch an der ClCH2-Gruppe zu CH3C(CH2As)3 (7) reduziert. Nach Absublimation des Hauptprodukts 7 erhält man nach Hydrolyse des Rückstands ein Gemisch aus 3a und dem homologen Heteroadamantan CH3C(CH2AsO)3 (10).
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