ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    First example of an isolable .sigma.-sulfurane with an apical alkyl group effected by transannular bond formation between the amino and the sulfonio groups (1983)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 105 (1983), S. 6965-6966 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00361a040
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Synthesis of New Transition Metal Carbene Complexes from .pi.-Sulfurane Compounds: Reaction of 10-S-3 Tetraazapentalene Derivatives with Pd(PPh3)4 and RhCl(PPh3)3 (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 3623-3624 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00117a036
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    TEMPO radicals showing magnetic interactions. I. 4-(4-Halobenzylideneamino)TEMPO and related compounds (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 231-245 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: X-ray crystal structure analyses of the 4-(4-halobenzylideneamino)TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidyl-1-oxyl) radicals 4-(4-fluorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, 4-(4-chlorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, 4-(4-bromobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl and 4-(4-iodobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl, and other 4-Ar—CH=N—TEMPO [Ar = 4-Ph-Ph, 2,2,6,6-tetramethyl-4-(4-phenylbenzylideneamino)piperidyl-1-oxyl, 4-Py, 2,2,6,6-tetramethyl-4-(4-pyridylmethylideneamino)piperidyl-1-oxyl, and 3,5-diCl-Ph, 4-(3,5-dichlorobenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl] radicals have been performed at room temperature. Some of these radicals show intermolecular ferromagnetic interactions at extremely low temperatures. X-ray analysis revealed that crystals of the 4-I-Ph derivative showed two modifications [(a) and (b)]; measurements of the magnetic properties of these crystals showed a ferromagnetic transition at an extremely low temperature for modification (a) and an antiferromagnetic interaction for modification (b). The structural features of these TEMPO radical crystals can be classified into three groups: (i) the crystal structures of the 4-Cl-Ph, 4-I-Ph(a) and 4-Ph-Ph derivatives, which show a ferromagnetic transition; (ii) the structures of the 4-Br-Ph and 4-Py derivatives, which show a ferromagnetic interaction (θ 〉 0); (iii) miscellaneous: the antiferromagnetic 4-F-Ph and 4-I-Ph(b) derivatives (θ 〈 0) and the ferromagnetic 3,5-diCl-Ph (θ 〉 0) derivative. Sheet-like arrangements of O atoms and intra-sheet interactions through the CH2 or CH3 groups of the TEMPO rings are related to the mechanisms of the ferromagnetic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768198012786
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    TEMPO radicals showing magnetic interactions. II. 4-(Benzylideneamino)-TEMPO and related compounds (1999)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 55 (1999), S. 1057-1067 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: X-ray crystal structure analyses were performed on 4-(Ar-methyleneamino)-TEMPO radicals at room temperature (TEMPO = 2,2,6,6-tetramethylpiperidyl-1-oxyl): Ar = Ph [4-(benzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl], 4-MeS-Ph [2,2,6,6-tetramethyl-4-(4-methylthiobenzylideneamino)piperidyl-1-oxyl], 4-Me-Ph [4-(4-methylbenzylideneamino)-2,2,6,6-tetramethylpiperidyl-1-oxyl], 4-PhO-Ph [2,2,6,6-tetramethyl-4-(4-phenoxybenzylideneamino)piperidyl-1-oxyl], 4-MeSO_{2}-Ph [2,2,6,6-tetramethyl-4-(4-methylsulfonylbenzylideneamino)piperidyl-1-oxyl], 3-Py [2,2,6,6-tetramethyl-4-(3-pyridylmethylideneamino)piperidyl-1-oxyl] and 2-Naph [2,2,6,6-tetramethyl-4-(2-naphthylideneamino)piperidyl-1-oxyl]. Structures of Ph and 4-Me-Ph derivatives were also determined at 100 K. Some of these crystals have been revealed to show intermolecular ferromagnetic interactions at an extremely low temperature. Structural features of crystals of Ph, 4-MeS-Ph and 3-Py derivatives, which show ferromagnetic interactions, are very similar to each other. In these crystals, O atoms are arranged to form a sheet. The ferromagnetic interactions are considered to be transferred through O...H van der Waals' interactions of the \beta-H atoms of the neighboring TEMPO rings within the sheet. Between O...O sheets, the aryl groups are arranged in a herringbone manner. The crystal structure of the 4-Me-Ph derivative, which shows an antiferromagnetic interaction, is also pseudo-isostructural with those of Ph, 4-MeS-Ph and 3-Py derivatives, while the arrangement of the aryl groups is different. The packing mode of the crystals of the 4-MeSO_{2}-Ph derivative, of which the Weiss constant \theta is nearly zero, is very different from those of the other derivatives showing magnetic interactions. The fact that the crystal structure of the paramagnetic 4-MeSO_{2}-Ph derivative does not show the O...O sheet structure accompanying the O...\beta-H interactions indicates that the intermolecular ferromagnetic interactions through \beta-H atoms within the O...O sheet are important for these TEMPO radical crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768199007326
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    2,3,3a,4,9,9a-Hexahydro-9-phenylbenzo[f]indene derivatives (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 827-829 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compounds, 3a,9a-trans-9,9a-trans-4,4-dimethyl-9-phenyl-2,3,3a,4,9,9a-hexahydrobenzo[f]indene, C21H24, (I), and 3a,4-trans-3a,9a-cis-9,9a-trans-4-methoxy-9-phenyl-2,3,3a,4,9,9a-hexahydrobenzo[f]indene, C20H22O, (II), are products of the photoinduced electron-transfer reaction of 1,1-diphenyl-1,n-alkadienes. The molecular structures are in good agreement with those proposed from the reaction mechanisms. The central rings of the fused systems of both compounds take chair and boat conformations in (I) and (II), respectively. There are no remarkable short contacts shorter than the sum of the van der Waals radii in the crystals, but some weak C—H...π interactions are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270100004091
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Two-component molecular crystals from N-heteroaromatics and nitrobenzoic acids (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 1067-1072 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Five two-component molecular crystals, benzimidazolium 3-nitrobenzoate, C7H7N2+·C7H4NO4−, (I), benzimidazolium 4-nitrobenzoate, C7H7N2+·C7H4NO4−, (II), 1H-benzotriazole–3-nitrobenzoic acid (1/1), C6H5N3·C7H5NO4, (III), imidazolium 3-nitrobenzoate, C3H5N2+·C7H4NO4−, (IV), and imidazolium 4-nitrobenzoate, C3H5N2+·C7H4NO4−, (V), were prepared with the aim of making chiral crystals. Only (I) crystallizes in a chiral space group. The molecules of (I) and (II) are linked by hydrogen bonds to form 21 spiral chains. In (III), (IV) and (V), macrocyclic structures are formed from two acid and two base components, by an alternate arrangement of the acid and base moieties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101009118
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Dipyrimidine–copper(II) dinitrate complexes showing magnetic interactions (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 288-295 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Crystals of CuII(NO3)2(pm)3 (1), and two crystalline forms of CuII(NO3)2(H2O)2(pm)2, (2) and (3), showed ferromagnetic, antiferromagnetic and paramagnetic interactions at extremely low temperatures, respectively. Crystal structure analyses revealed that the complexes were catena-dinitrato[μ-pyrimidine-κN1:κN3]-(pyrimidine-N1)copper(II), [Cu(NO3)2(pm)2]n, catena-diaquadinitrato[μ-pyrimidine-κN1:κN3]copper(II), [Cu(NO3)2(H2O)2(pm)]n, and diaquadinitratodipyrimidinecopper(II), Cu(NO3)2(H2O)2(pm)2 for (1), (2) and (3), respectively. In (1) the Cu atom is coordinated by the two nitrates and N atoms of the non-bridging pyrimidine and bridging pyrimidine to form a one-dimensional coordination polymer. The complex is a five-coordinated square pyramid and can be regarded as a pseudo-seven-coordinated complex, since other short non-bonding Cu...O contacts are observed. In the crystals of (2) the pyrimidine bridges the Cu atoms to form a one-dimensional coordination chain. On the other hand, complex (3) is not a coordination polymer. It is important to form a coordination polymer for the appearance of the magnetic interactions. Types of coordination of the bridging organic moieties should also play an important role in magnetic properties. Magnetic measurements of (1) and (2) show that they are good examples of uniform S = 1/2 ferro- and antiferromagnetic Heisenberg chains with exchange parameters 2J/kB = +1.8 and −36 K, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768101002737
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Bis(hfac)-copper(II) complexes bridged by pyrimidines showing magnetic interactions (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 772-779 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Crystals of bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)bispyrimidinecopper(II) (1), bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)bis(4-methylpyrimidine)copper(II) (2), bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)bis(quinazoline)copper(II) (3) showed ferromagnetic interactions at extremely low temperature. Crystal structure analyses revealed that these complexes were catena-bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)[μ-pyrimidine-N1:N3]copper(II), [Cu(hfac)2(pm)2]n, catena-bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)[μ-4-methylpyrimidine-N1:N3]copper(II), [Cu(hfac)2(4-Me-pm)]n, and catena-bis(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)[μ-pyrimidine-N1:N3]copper(II), [Cu(hfac)2(qz)]n, for (1), (2) and (3), respectively. In (1) and (2) the pyrimidines bridge the Cu atoms with an axial–equatorial mode to form one-dimensional spiral chains. Complex (3) also forms a one-dimensional chain structure. The coordination mode of (3) is axial–axial at room temperature, while axial–equatorial at 120 K. On the other hand, the structure of the other modification of the 4-methylpyrimidine complex (4), showing paramagnetic properties, was revealed to be a trinuclei complex bridged by two 4-methylpyrimidines, tris[bis-(1,1,1,5,5,5-hexafluoropentane-2,4-dionato)copper(II)][bis-μ-4-methyl-pyrimidine-N1:N3]. The chain structures with an axial–equatorial coordination mode of the bridging organic moieties should play an important role in the appearance of the ferromagnetic interactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768101013568
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Polymerization of allyl esters of unsaturated acids, 12Part 11: cf.11. Cyclopolymerization of methyl 2-methylallyl fumarate (1986)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 711-721 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The kinetics of radical-initiated cyclopolymerization of methyl 2-methylallyl fumarate (MMAF) was investigated and compared with the polymerization results of allyl methyl fumarate (AMF). In the former, the extent of cyclization and five-membered ring formation were enhanced. The cyclization constants KA and KV, the ratio of the rate constant of the unimolecular cyclization reaction to that of the bimolecular propagation reaction of the uncyclized 2-methylallylic and fumaric radicals, were estimated to be 3,1 and 3,0 mol · dm-3, respectively. On the basis of these results the formation mode and the sequence distribution of the structural units of the polymer produced are discussed in detail; the low probability for fumaric vinyl addition and high probability for the succession of cyclic structures are calculated for poly(MMAF) as opposed to those of poly(AMF). The cyclopolymerizability and five-membered ring formation are enhanced at elevated temperature. These results are discussed from the standpoint of the steric effect on cyclopolymerizability.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1986.021870401
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Simple preparation of sterically congested 1,9-disubstituted dibenzothiophenes and formation of their dithia dications via transannular S-S interactionDedicated to Prof. James Cullen Martin on the occasion of his sixty-fifth birthday. (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 4 (1993), S. 243-252 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 4,6-Disubstituted thianthrene-5-oxides reacted with n-butyllithium to afford sterically crowded 1,9-disubstituted dibenzothiophenes (3) in moderate yields. The structures of the phenylthio derivative 3a and its monooxide 6a were determined by X-ray crystallographic analysis, which revealed that the distances between the two outer sulfur atoms are 3.012 Å (3a) and 3.016 Å (6a). 1,9-Disubstituted dibenzothiophenes 3 and their monooxides 6 afforded the corresponding dithia dications on dissolution in conc. sulfuric acid. The lower oxidation potentials of compounds 3 compared with other dibenzothiophene derivatives reveal evidence for strong transannular interaction between the two outer sulfur atoms.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520040219
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...