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  • 1
    Electronic Resource
    Electronic Resource
    Crown-containing styryl dyes (1993)
    Springer
    Russian chemical bulletin 42 (1993), S. 1385-1389 
    Details
    ISSN: 1573-9171
    Keywords: crown-containing styryl dyes ; complexes with Mg2+ ; photocyclodimerization ; cyclobutane derivatives ; 1H and13C NMR spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Styryl dyes containing a crown ether group and a heteroaromatic moiety with a sulfoalkylN-substituent (1a,b) undergo photocyclodimerization in acetonitrile in the presence of Mg(ClO4)2 to give only the typeA isomer of cyclobutane derivative (2a,b). The photochemical regio- and stereoselectivity of the cycloaddition is explained by self-organization of thetrans-isomers of the styryl dyes upon complexation with the Mg2+ cations into dimers with a fixed mutual arrangement of multiple bonds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00699938
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of formyl derivatives of benzocrown ethers containing N, S, and O heteroatoms in the macrocycle (1995)
    Springer
    Russian chemical bulletin 44 (1995), S. 116-123 
    Details
    ISSN: 1573-9171
    Keywords: 4′-bromobenzocrowns, synthesis, metallation ; 4′-formylbenzocrown ethers ; semicarbazones and oximes of 4′-formylbenzocrown ethers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A method for the synthesis of 4′-bromobenzodithia-15(18)-crown-5(6) and 4′-bromobenzodiaza-15 (18)-crown-5(6) by condensation of 3,4-di(2′-haloethoxy)bromobenzene with polyoxaalkanes containing terminal SH or NHMe groups was suggested. The method for the synthesis of formyl derivatives of benzocrowns containing N, S, and O heteroatoms in the macrocycle based on the metallation of appropriate bromo derivatives with BunLi followed by treatment of the resulting organolithium intermediates with DMF was developed. Oximes and semicarbazones of benzaldehydes containing a crown ether fragment were obtained, and their transformation into the original aldehydes by treatment with KNO2 in an acid medium was studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00696971
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    Paper (German National Licenses)
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