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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 415-418 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trifluoromethyl Isocyanide, a Strong π-Accepting Ligand - Pentacarbonyl(trifluoromethyl isocyanide)chromium and -tungstenTrifluoromethyl isocyanide (2) reacts with (CO)5M(THF) (1a,b;a: M = Cr, b: M = W) to form the new complexes (CF3NC)M(CO)5 (3a, b). From the vibrational spectra, which resemble those of the hexacarbonyl complexes, it is concluded, that the new ligand is a strong π-acceptor.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 1153-1160 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Way to Pentafluorocyclopentadienyl Anion: 1,2,3,4,5-Pentafluorocyclopentadiene1,2,3,4,5-Pentafluorocyclopentadiene (8) was obtained in three steps from hexachlorocyclopentadiene (2). It is a typical cyclopentadiene. Thus, it dimerizes reversibly already at - 78°C.
    Notes: 1,2,3,4,5-Pentafluorcyclopentadien (8) wurde in drei Stufen aus Hexachlorcyclopentadien (2) hergestellt. Es ist ein typisches Cyclopentadien. So dimerisiert es - reversibel - bereits bei - 78°C.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 560-563 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tetrakis(trifluoromethyl isocyanide)nickel, Ni(CNCF3)4, and Bis[μ-(trifluoromethyl isocyanide)-(η-cyclopentadienyl)nickel], [Ni(μ-CNCF3)(η-C5H5)]2Tetrakis(trifluoromethyl isocyanide)nickel (3) is formed in the reaction of tetracarbonylnickel (1) and trifluoromethyl isocyanide (2). 3 is the first homoleptic trifluoromethyl isocyanide complex. The dinuclear complex [Ni(μ-CNCF3)(η-C5H5)]2 (5) is isolated in high yield from the reaction of 3 with bis(η-cyclopentadienyl)nickel (4). Its spectroscopic data proof the existence of the isocyanide bridged isomer.
    Notes: Tetrakis(trifluormethylisocyanid)nickel (3) bildet sich in guten Ausbeuten bei der Reaktion von Tetracarbonylnickel (1) mit Trifluormethylisocyanid (2). 3 ist der erste homoleptische Trifluormethylisocyanidkomplex. Der zweikernige Komplex [Ni(μ-CNCF3)(η-C5H5)]2 (5) entsteht aus 3 und Bis(η-cyclopentadienyl)nickel (4). Seine spektroskopischen Daten beweisen das alleinige Vorliegen des Trifluormethylisocyanid-überbrückten Isomeren.
    Additional Material: 1 Tab.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 614 (1992), S. 121-130 
    ISSN: 0044-2313
    Keywords: Iron ; cluster ; carbonyl ; alkyne ; vinylidene alkylidyne ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Undecacarbonyl(acetonitrile)triiron with Alkyne Ethers(CO)11(CH3CN) 1 reacts with the alkyne ethers H3C—C≡C—OC2H5 2a, H—C≡C—OC2H5 2b, H3C—O—CH2—C≡C—CH2—O—CH3, 2c and H3C—O—C(CH3)H—C≡C—C(CH3)H—O—CH3 2d forming different cluster products depending on the substituents and the reaction conditions. The product obtained with 2a is the bisalkylidyne cluster Fe3(CO)9(m̈3-C—CH3)(m̈3-C—OC2H5) 3 which results from the cleavage of the carbon carbon triple bond. The alkyne 2b however yields the vinylidene cluster Fe3(CO)10(m̈3-η2-C—C(H)OC2H5) 4 by 1,2 proton shift. The alkyne clusters Fe3(CO)10(m̈3-η2-C—C(H)OC2H5) 4 by 1,2 proton shift. The alkyne clusters Fe3(CO)10(m̈3-η2- H3 C—O—CH2—C≡C—CH2—O—CH3) 6 and Fe3(CO)9(m̈-η2-H3C—O—CH2—C≡C—CH2—O—CH3) 7 are the isolated products obtained from 2c. Thermolysis of 7 results in the formation of the dinuclear butatrien complex Fe2(CO)6 (H2C—C—C—CH2) 8a. The analogous compound Fe2(CO)6[H(H3C)C — C — C — C(CH3)H] 8b is the only product of 2d and 1. The structures of 4, 5, and 6 have been determined by crystal structure determinations.
    Notes: Fe3(CO)11(CH3CN) 1 reagiert mit den Alkinethern H3C—C≡C—OC2H5 2a, H—C≡C—OC2H5 2b, H3C—O—CH2—C≡C—CH2—O—CH3 2c und H3C—O—C(CH3)H—C≡C—C(CH3)H—O—CH3 2d in Abhängigkeit von den Substituenten und Reaktionsbedingungen zu unterschiedlichen Clusterverbindungen. Mit 2a wird unter Spaltung der C—C-Dreifachbindung der Bisalkylidin-Cluster Fe3(CO)9(m̈3-C—CH3)(m̈3-C—OC2H5) 3 erhalten. Umsetzung mit dem Alkin 2b hingegen ergibt bei kurzer Reaktionszeit bei Raumtemperatur unter 1,2-H-Verschiebung den Vinyliden-Cluster Fe3(CO)10(m̈3-η2-C—C(H)OC2H5) 4, während bei langen Reaktionszeiten bei -30°C die zweikernige Verbindung Fe2(CO)6(m̈-H5C2O—C—C(H)—CO—C(H) — C—OC2H5) 5 erhalten wird. Die Alkin-Cluster Fe3(CO)10(m̈3-η2-H3C—O—CH2—C≡C—CH2—O—CH3) 6 und Fe3(CO)9 · (m̈3-η2-H3C—O—CH2—C≡C—CH2—O—CH3) 7 sind die isolierten Reaktionsprodukte von 1 mit 2c. Pyrolyse von 7 ergibt den zweikernigen Butatrien-Komplex Fe2(CO)6(H2C—C—C—CH2) 8a. Die analoge Verbindung, Fe2(CO)6[H(H3C)C—C—C—C(CH3)H] 8b, ist das einzige Produkt der Reaktion von 1 mit 2d. Die Strukturen der Verbindungen 4, 5 und 6 wurden durch Kristallstrukturanalysen bestimmt.
    Additional Material: 3 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 111-120 
    ISSN: 0044-2313
    Keywords: Iron cluster ; phosphine ligands ; fluoromethylidine ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses, Structure Determination and Reactions of Phosphine Substituted Derivatives of Fe3(CO)9(μ3-CF)2Photolysis of Fe3(CO)9(μ3-CF)2 1 in the presence of acetonitrile 2a or benzoenitrile 2b results in the substitution of a single carbonyl ligand by a nitrile ligand yielding Fe3(CO)8(CH3CN)(μ3-CF)2 3a and Fe3(CO)8(C6H5CN)(μ3-CF)2 3b, respectively. The acetonitrile ligand in 3a can be easily replaced by trimethyl-phosphine 4a or triphenylphosphine 4b. The monosubstituted compounds Fe3(CO)8(PR3)(μ3-CF)25, R = CH3 a, R = C6H5, b are obtained as major products besides a small amount of the disubsituted products Fe3(CO)7(PR3)2(μ3-CF)2 6. The structure of 5a has been elucidated by a single crystal X-ray structure determination. Thermal ligand substitution in 1, however, results in the formation of a mixture of mono-, disubstituted, and trisubstituted products, in which 6b is the major product for diphenylphosphine. 5a reacts with ethyne 7 forming a phosphine substituted diferra-allyl-cluster Fe3(CO)7(PR3)(μ3-CF)(μ3—CF—CH—CH) 8. The structure of one isomere of 8 has been determinated by X-ray crystallography.
    Notes: Die Photolyse von Fe3(CO)9(μ3-CF)2, 1 in Gegenwart von Acetonitril 2a oder Benzonitril 2b ergibt unter Substitution eines Carbonylliganden durch den Nitrilliganden Fe3(CO)8(CH3CN)(μ3-CF)2 3a und Fe3(CO)8(C6H5CN)(μ3-CF)2 3b. Der Acetonitrilligand in 3a kann leicht durch Trimethylphosphan 4a oder Triphenylphosphan 4b ausgetauscht werden. Es entstehen die monosubstituierten Verbindungen Fe3(CO)8(PR3)(μ3-CF)2 5, R = CH3, a, R = C6H5, b, als Hauptprodukte. Neben diesen werden in geringen Mengen auch die disubstituierten Verbindungen Fe3(CO)7 PR3)2(μ3-CF)2 6 gebildet. Die Struktur von 5a konnte durch eine Kristallstrukturanalyse geklärt werden. Die thermische Ligandensubstitution von 1 fuhrt immer zu einem Gemisch von mono-, di- und trisubstituierten Produkten, im Falle von Triphenylphosphan 4b ist 6b das Hauptprodukt. 5a reagiert mit Ethin 7 unter Bildung des phosphansubstituierten Diferra-Allyl-Cluster Fe3(CO)7(PR3)(μ3-CF)(μ3-CF—CH—CH) 8. Die Struktur eines der Isomeren von 8 wurde durch eine Einkristallstrukturanalyse aufgeklärt.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 467-470 
    ISSN: 0009-2940
    Keywords: Trifluoromethyl isocyanide complexes / Nucleophiles, reactions with / Carbene complexes (Pentamethylcyclopentadienyl)cobalt / Cobalt complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of (Pentamethylcyclopentadienyl)bis(trifluoromethyl isocyanide)cobalt with NucleophilesThe title complex 1, reacts with amines in water-saturated diethyl ether to form the five-membered cobaltaheterocycles 3/. In addition these complexes 3a-c contain an N(trifluoromethyl)formimidoyl ligand. The structure of 3a has been established by an X-ray crystal structure analysis.
    Additional Material: 3 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 257-260 
    ISSN: 0009-2940
    Keywords: Chromium isocyanide complexes / Isocyanide ligands ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cr(CO)4(CNCF3)(CNCH3) and Cr(CO)4(CNCF3) (CNC6H5), Isocyanide Complexes with +I- and - I-substituted IsocyanidesPentacarbonyl(trifluoromethyl isocyanide)chromium (1) undergoes photolytic substitution of exclusively one carbonyl ligand by THF. According to the IR spectrum, (CO)4Cr(CNCF3) (THF) (2) consists of a mixture of the trans and cis isomer. 2 reacts with methyl isocyanide (3) and phenyl isocyanide (4) forming 9CO)4Cr(CNCF3) (CNCH3) (5) and (CO)4Cr(CNCF3) (CNC6H5) (7), respectively. 5 is obtained as a mixture of the trans and cis isomer (10:1), which can be separated by chromatography. In addition, a small amount of the disubstituted compound (CO)3Cr(CNCF3) (CNCH3)2 (6) is obtained, which according to its spectroscopic data contains the CNCF3 ligand and one CNCH3 ligand in trans position. In the case of 7, the trans isomer is the only product observed. The structure of trans-5 has been established by X-ray crystal structure determination.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 751-755 
    ISSN: 0009-2940
    Keywords: Trifluoromethyl isocyanide complexes / Carbene complexes / Chromium complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reactions of Pentacarbonyl(trifluoromethyl isocyanide)chromium with NucleophilesPentacarbonyl(trifluoromethyl isocyanide)chromium (1) reacts with nucleophilic reagents like secondary amines (2a-d), 1,2-dimethylhydrazine (2e), or methanol (2f). The first nucleophilic attack occurs at the isocyanide carbon atom. The formed Fischer-type carbene complexes readily eliminate HF under the reaction conditions forming a difluoromethanimine moiety, which is further attacked by the nucleophile. The isolated products are carbene complexes of the type (CO)5Cr[C(NR2]N=C(NR2)F] (3a-c), (CO)5Cr[C(NR2)N=C(NR2)2](3d), (CO)5Cr[CN(CH3)N(CH)3C{N(CH3)H}=N] (3e), and (CO)5Cr(C(OCH3)N=C(OCH3)2] (3f). The structure of 3c has been determined by an X-ray crystal structure analysis.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1481-1484 
    ISSN: 0009-2940
    Keywords: Alkylidyne complexes ; Clusters ; Halogen exchange reaction ; Iron complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nonacarbonylbis(μ3-methylidyne)triironHalogen exchange reaction in Fe3(CO)9(μ3—CF)2 (1) with BBr3 (3) yields Fe3(CO)9(μ3—CBr)2 (4), which can be converted by (C4H9)3SnH (5) into Fe3(CO)9(μ3—CH)2 (6). 6 is the parent compound of the bis(alkylidyne)triiron clusters. Selective reduction of the CBr moiety in Fe3(CO)9(μ3—CBr) (μ3—CCO2CH3) (7) results in the formation of Fe3(CO)9(μ3—CH) (μ3—CCO2CH3) (8). The structure of 8 has been elucidated by an X-ray crystalstructure determination.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 124 (1991), S. 773-775 
    ISSN: 0009-2940
    Keywords: Alkyne complexes ; Clusters ; Iron complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaction of undecacarbonyl(acetonitrile)triiron (1) with 1,4-dimethoxy-2-butyne (2) yields the alkyne complexes decacarbonyl(μ3;-η2-Verbar-1,4-dimethoxy-2-butyne)triiron (3) and nonacarbonyl(μ3;-η2;-⊥-1,4-dimethoxy-3-butyne)triiron (4). The crystal structure determination of 2 shows that the alkyne ligand is coordinated strictly parallel to one iron-iron edge.
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