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  • 1
    Electronic Resource
    Electronic Resource
    Diisopropylammonium hydrogen difluoride (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 994-995 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: By the reaction of diisopropylamine with concentrated hydrofluoric acid, the title compound, C6H16N+·HF2−, was synthesized. The cations and anions are connected via hydrogen bonds to form chains along [100]. The interlocked polymeric zigzag chains are hexagonally surrounded by six neighbouring chains. The F− anion is strongly hydrogen bonded to HF [F—H 0.98 (4), H...F 1.34 (4), F...F 2.3125 (16) Å and F—H...F 174 (3)°]; a better description is that of a non-centred hydrogen difluoride anion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270101008836
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  • 2
    Electronic Resource
    Electronic Resource
    Triaquatris[tetraoxorhenato(VII)]neodymium(III)I thank Thomas Hecht for the preparation of the title compound, during a course in advanced inorganic chemistry. (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. i35-i37 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, Nd(ReO4)3(H2O)3, crystallizes isostructurally with its analogous triaquatris[tetraoxorhenato(VII)]lanthanum(III) compound. The neodymium is coordinated by three water molecules and six O atoms of six tetraoxorhenate(VII) anions. The coordination polyhedron at the Nd is that of a tricapped trigonal prism. The three coordinated water molecules form five hydrogen bonds to four tetraoxorhenate(VII) anions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801006869
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  • 3
    Electronic Resource
    Electronic Resource
    (2SR,4RS)-(4-Iodo-5,5-dimethyl-2-hexylsulfonyl)benzene (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o959-o960 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: From a hexane solution, the title compound, C14H21IO2S, crystallizes in the centrosymmetric space group Pbca with one molecule in the asymmetric unit. As a result of the bulky substituent, small deviations from ideal bond angles are found for the aliphatic part of the molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801015069
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  • 4
    Electronic Resource
    Electronic Resource
    (2R,4R)-(4-Iodo-5,5-dimethyl-2-hexylsulfonyl)benzene (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o961-o963 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Structure refinement of X-ray diffraction data in the polar space group P21 and the assignment of the absolute structure identified the crystal of the title compound, C14H21IO2S, under investigation as the 2R,4R isomer. The packing is dominated by hydrophobic layers in the a0c and a½c planes and hydrophilic stacks along [100].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801015070
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  • 5
    Electronic Resource
    Electronic Resource
    Protonation products of pentaaminopentane as novel building blocks for hydrogen-bonded networksLinear primary polyamines as building blocks for coordination polymers. Part 2. Part 1: Zimmer et al. (1998). (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 284-288 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structures of 3-amino-1,2R,4S,5-tetraammoniopentane tetrachloride monohydrate, C5H21N54+·4Cl−·H2O, and 1,2R,3,4S,5-pentaammoniopentane tetrachlorozincate trichloride monohydrate, (C5H22N5)[ZnCl4]Cl3·H2O, have been determined from single-crystal X-ray diffraction data. Both compounds show a complex network of N—H...O, O—H...Cl and N—H...Cl hydrogen bonds. There are a total of 14 H atoms of the tetra-cation and 15 H atoms of the penta-cation available for hydrogen bonding. However, due to the particular shape of the primary linear polyammonium cations, only a certain number of H atoms can be involved in hydrogen-bond formation. It is further shown that hydrogen bonding has an influence on the conformation of such alkylammonium cations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199015024
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  • 6
    Electronic Resource
    Electronic Resource
    Ligand Synthesis and Metal Complex Formation of 1,2,3-Triaminopropane (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 2079-2086 
    Details
    ISSN: 1434-1948
    Keywords: N Ligands ; Copper ; Coordination polymers ; Stability constants ; Solid-state structures ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of linear primary polyamines H2N-CH2-(CH-NH2)n-CH2-NH2 (1 ≤ n ≤ 3) was prepared from the corresponding polyalcohols. The polyamines were isolated as HCl adducts and the acidity constants in aqueous solution were determined. The crystal structure of the fully protonated tetraamine (n = 2) was elucidated by an X-ray diffraction study. Complex formation of the triamine (n = 1) with Ni2+, Cu2+, Zn2+, Cd2+ was re-investigated in aqueous solution. The pH-dependent formation of a variety of species MxLyHz was established by potentiometric titrations and was compared with previous reports. The crystal structure of the Cu complex [CuL2]Cl2 exhibited a chain structure with a five-coordinate CuII centre in which two amino groups of the triamine ligands are coordinated to one Cu centre, while the third amino group of one of the ligands is bonded to a neighbouring Cu atom. The compound shows weak antiferromagnetic coupling interactions between the CuII centres within the chain.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    3,5-Dimesityl-1,2,4-oxadiphosphole - Synthesis and Reactivity of a Novel Heterocycle (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 587-595 
    Details
    ISSN: 1434-193X
    Keywords: Phosphaalkenes ; Heterodiphospholes ; Cycloadditions ; Phosphaalkyne cyclooligomers ; Phosphorus-carbon cage compounds ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: -The first synthesis of a 1,2,4-oxadiphosphole 6 has been achieved by vacuum thermolysis of mesitylphosphaalkene 5. The novel heterocycle 6 exhibits an enormous potential for cycloaddition reactions, which predominantly proceed selectively at low temperatures. Compound 6 undergoes addition with two equivalents of phosphaalkynes 10 by a [4+2] cycloaddition/homo Diels-Alder reaction sequence to form novel oxatetraphosphadeltacyclenes 12 and 13. Tetrachloro-o-benzoquinone (14) undergoes a selective [4+1] cycloaddition with 12 and 13 leading to the spirocyclic products 15 and 16 containing λ5-phosphorus atoms. Treatment of the oxadiphosphole 6 with dimethyl acetylenedicarboxylate (17) provides the first access to a 1,2-oxaphosphole 18, which is formed after an initial [4+2] cycloaddition followed by a retro Diels-Alder reaction. An unexpected reaction of 6 is observed with tri-tert-butylazete (20) furnishing a new polycyclic system (→ 21).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Photolysis of Tricarbonyl(η5-cyclohexadienyl)manganese in Tetrahydrofuran, Reactions with Cumulated Dienes (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 655-661 
    Details
    ISSN: 1434-1948
    Keywords: Manganese complexes ; Organyl complexes ; C-C coupling ; [5+2] Cycloaddition ; Cumulenes ; Photochemistry ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: [Mn(η5-C6H7)(CO)3] (1) forms highly reactive [Mn(η5-C6H7)(CO)2(THF)] (2) upon UV irradiation in THF at 208 K. Solvent complex 2 reacts between 208 and 293 K with 1,1-disubstituted allenes C3H2RR′ [R, R′ = CH3, CH3 (A); CH3, C6H5 (B); C2H5, C6H5 (C); C6H5, C6H5 (D); OCH3, Si(CH3)3 (E)] to four different types of complexes: The [5+2] cycloadduct [Mn(η3:2-C9H9RR′)(CO)3] (3E), rearranged [5+2] cycloadducts [Mn(η3:2-C9H9RR′)(CO)3] (4B, 4C, 4D), 1:2 adducts [Mn(η3:2-C12H11R2R′2)(CO)3] (5A-5E), and the 1:3 adduct [Mn{η3:2:2-C15H13(CH3)6}(CO)2] (6A). The constitutions of the products were established by IR and NMR spectroscopy, as well as by C,H elemental analysis and mass spectrometry. The crystal and molecular structure of 6A was determined by X-ray structure analysis. A formation mechanism for the complexes is proposed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Reductive Decyanation of Annulated Aminocyclopropane-endo-carbonitriles - a way to annulated cyclopropane-exo-aminesPresented in part at the third conference on iminium salts, Stimpfach-Rechenberg (Germany), September 17-19, 1997 (1998)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 340 (1998), S. 356-360 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Annulated Aminocyclopropane-endo-carbonitriles 11a,b are reductively decyanated by sodium in liquid ammonia with complete retention of configuration. An additionally existing chlorine atom in the starting materials 12a,c-e, thereby, is simulataneously replaced by hydrogen. The preparative advantage of this method is demonstrated by the selective access to 6α-H-isomers 13b and 13e as members of the ensemble of bicyclo[3.1.0]hexanediyl-dimorpholine diastereomers. A strong buckled bicyclohexane unit is present in 3α,6αisomer 13e as indicated by 1H NMR spectroscopy and X-ray structural analysis.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19983400410
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  • 10
    Electronic Resource
    Electronic Resource
    Alkylammonium Hexachlorometallates, IVPart III: Ref.[1].. Synthesis and Crystal Structure of Bis(1,4-diammoniobutane) Diaquahydrogen Hexachlororhodate(III) Dichloride, [H3N-(CH2)4- NH3]2[H5O2][RhCl6]Cl2 (1996)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 129 (1996), S. 1355-1359 
    Details
    ISSN: 0009-2940
    Keywords: Hexachlororhodates ; 1,4-Diammoniobutane ion ; Diaquahydrogen ion ; Hydrogen bonding ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bis(1,4-diammoniobutane) diaquahydrogen hexachlorohodate(III) dichloride, [H3N-(CH2)4 -NH3]2[H5O2][RhCl6]Cl2 (1), was synthesized by the reaction of rhodium(III) chloride with 1,4-diaminobutane dihydrochloride in concentrated hydrochloric acid. The red compound slowly decomposes at room temperature, but is stable for months and up to 106°C (DTA) under hydrogen chloride. Crystals of 1 were obtained by diffusion-controlled crystallization (space group P,1¯). The solid-state structure can be considered as a sequence of layers linked by hydrophobic interactions between the aliphatic chains of the 1,4-diammoniobutane ions. Within these layers the hydrophilic building blocks (hexachlororhodate and chloride anions, the diaquahydrogen cations and the ammonio groups of the diammoniobutane cations) are connected by a complex system of O—H-Cl and N—H-Cl hydrogen bonds. The H5O2+ ion has a crystallographically imposed Ci symmetry and shows the typical 1:1 disorder of the central hydrogen atom for a symmetrically strong [O-O 2.406(10) Å] doubleminimum potential O-H-O bond.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19961291107
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