scholarly journals Übergangsmetall-Carben-Komplexe, CXXXIV [1]. Synthese neuer Mono- und Biscarben-Komplexe der VI. Nebengruppe; Röntgenstruktur des ersten Bis[amino(alkoxy)carben]-Komplexes / Transition Metal Carbene Complexes, CXXXIV [1]. Synthesis of New Mono- and Bis-Carbene Complexes of Group VIb Elements; Structure of the First Bis[amino(alkoxy)carbene]-Complex

1984 ◽  
Vol 39 (5) ◽  
pp. 668-674 ◽  
Author(s):  
Ernst Otto Fischer ◽  
Rudolf Reitmeier ◽  
Klaus Ackermann
Keyword(s):  
Molecular Structure ◽  
Transition Metal ◽  
Spectroscopic Data ◽  
The Novel ◽  
Nucleophilic Agent ◽  
Reaction Conditions ◽  
Carbene Complexes ◽  
X Ray ◽  
X Ray Crystallography ◽  
New Compounds

The hexacarbonyl compounds of chromium, molybdenum and tungsten react with the highly nucleophilic agent Li NiPr2 and in a subsequent alkylation with (Et3O)BF4 to give the carbene complexes (CO)5M[C(N′Pr2)OEt] (1, 3, 4). In case of W(CO)6 and Mo(CO)6 the novel biscarbene complexes cis(CO)4M[C(NiPr2)OEt]2 (2, 5) are additionally obtained. Reaction conditions, properties and spectroscopic data of the new compounds are reported. The molecular structure of cis(CO)4W[C(NiPr2)OEt]2 (4) was determined by X-ray crystallography

Übergangsmetall-Carben-Komplexe, CXXXI. Umsetzung von [(CO)5WCNEt2]BF4 mit anionischen Organylverbindungen von Elementen der V. Hauptgruppe/ Transition Metal Carbene Complexes, CXXXI. Reaction of [(CO)sWCNEt2]BF4 with Anionic Organyl Compounds of Group V Elements

1983 ◽  
Vol 38 (5) ◽  
pp. 582-586 ◽  
Author(s):  
Ernst Otto Fischer ◽  
Rudolf Reitmeier
Keyword(s):  
Transition Metal ◽  
Nucleophilic Addition ◽  
Spectroscopic Data ◽  
The Novel ◽  
Reaction Conditions ◽  
Group V ◽  
Carbene Complexes ◽  
Carbene Complex ◽  
Reductive Dimerization ◽  
New Compounds

AbstractThe cationic carbyne complex [(CO)5WCNEt2]BF4 (1) reacts with potassiumdiphenylamide, KNPh2, with nucleophilic addition of the amide anion to give (CO)5W[C(NEt2)NPh2] (2). The corresponding reactions with KPPh2, KPEt2, KPMePh, NaSbPh2 and NaBiPh2 yield the complex [(CO)5W(CNEt2)]2 (3), which is formed by reductive dimerization of two carbyne fragments. In case of KPMePh the carbene complexes (CO)5W[C(NEt2)PMePh (4) and trans-(MePhPH)(CO)4W[C(NEt2)PMePh] (5) are also obtained. On warming in solution 5 spontaneously rearranges to the novel cyclic carbene complex (6). Reaction conditions, properties and spectroscopic data of the new compounds are reported.

Übergangsmetall-Carben-Komplexe, CXXIII [1] Dicarbenoktacarbonyldirhenium-Komplexe / Transition Metal Carbene Complexes, CXXIII [1] Dicarbeneoctacarbonyldirhenium Complexes

1982 ◽  
Vol 37 (5) ◽  
pp. 627-630 ◽  
Author(s):  
Ernst Otto Fischer ◽  
Paul Rustemeyer
Keyword(s):  
Transition Metal ◽  
Spectroscopic Data ◽  
Reaction Conditions ◽  
Carbene Complexes ◽  
New Compounds

The reaction of Re2(CO)10 with LiSi(C6H5)3 and subsequent alkylation by (C2H5)3OBF4 yields not only (CO)9Re2C(OC2H5)Si(C6H5)3 but also Re1-ax,Re2-eq-[C(OC2H5)Si(C6H5)3]2(CO)8Re2 (1). The analogous isomeric complexes Re1-ax-[C(OC2H5)C6H4CH3]-Re2-eq-[C(OC2H5)Si(C6H5)3](CO)8Re2 (2) and Re1-ax-[C(OC2H5)Si(C6H5)3]-Re2-eq-[C(OC2H5)C6H4CH3](CO)8Re2 (3) are obtained by treatment of eq- or ax-(CO)9Re2C(OC2H5)Si(C6H5)3 with LiC6H4CH3 and subsequent alkylation by (C2H5)3OBF4. Reaction conditions, and properties and spectroscopic data of the new compounds are reported

Übergangsmetall-Carbin-Komplexe, LX [1]. Neue Triphenylsilyl-Carben-Komplexe des Rheniums durch Umsetzung eines kationischen Carbinkomplexes mit Nucleophilen / Transition Metal Carbyne Complexes, LX [1] Novel Triphenylsilyl Carbene Complexes of Rhenium by Reaction of a Cationic Carbyne Complex with Nucleophiles

1980 ◽  
Vol 35 (9) ◽  
pp. 1083-1087 ◽  
Author(s):  
Ernst Otto Fischer ◽  
Paul Rustemeyer ◽  
Dietmar Neugebauer
Keyword(s):  
Transition Metal ◽  
Structure Determination ◽  
Spectroscopic Data ◽  
Reaction Conditions ◽  
Carbene Complexes ◽  
X Ray ◽  
Compound C ◽  
Carbyne Complexes

The reaction between C5H5Re(CO)3 and LiSi(C6H5)3 affords the compound C5H5(CO)2ReC(OCH3)Si(C6H5)3 after subsequent alkylation with CH3SO3F. This complex reacts with BF3 to yield [C5H5(CO)2ReCSi(C6H5)3]BF4. This cationic carbyne complex yields C5H5(CO)2ReC(CH1)Si(C6H5)3 with LiCH3 and C5H5(CO)2ReC(H)Si(C6H5)3 with (C4H9)4NBH4. Reaction conditions, properties and spectroscopic data of the new com­pounds as well as an X-ray structure determination of C5H5(CO)2ReC(H)Si(C6H5)3 are reported.

Übergangsmetall-Carbin-Komplexe, LXXII [1]. Reaktionen von trans-Bromotetracarbonyl(phenylcarbin)chrom mit Lithiumthiokresolat und Lithiumselenophenolat / Transition Metal Carbyne Complexes, LXXII [1]. Reactions of trans-Bromotetracarbonyl(phenylcarbyne)chromium with Lithium Thiocresolate and Lithium Phenylselenolate

1982 ◽  
Vol 37 (10) ◽  
pp. 1274-1278 ◽  
Author(s):  
Werner Roll ◽  
Ernst Otto Fischer ◽  
Dietmar Neugebauer ◽  
Ulrich Schubert
Keyword(s):  
Hydrochloric Acid ◽  
Transition Metal ◽  
Structure Determination ◽  
Binuclear Complex ◽  
Spectroscopic Data ◽  
Reaction Conditions ◽  
X Ray ◽  
Carbyne Complexes ◽  
Ether Complex

The reaction of trans-bromotetracarbonyl(phenylcarbyne)chromium (1) with lithium phenylselenolate and subsequent protonation with aqueous hydrochloric acid leads to (CO)5Cr[Se2(C6H5)2] (3) and (CO)4Cr(μ-SeC6H5)2Cr(CO)4 (4). From 1 and lithium 4-methylphenylthiolate (CO)5CrC(C6H5)SC6H4CH3 (5) and (CO)5CrS(C2H5)(4-CH3C6H4) (6) are obtained, if triethyloxonium tetrafluoroborate is used instead of hydrochloric acid. The analoguous reaction of 1 with lithium phenylselenolate yields the seleno ether complex (7). Reaction conditions, properties, spectroscopic data and the results of an X-ray structure determination of the binuclear complex (4) are reported.

Übergangsmetallketen-Verbindungen, XII [1] Darstellung und Struktur von η5-C5H5(CO)2 [P(CH3)3]W-C≡C-C3H5 / Compounds of Transition Metal Ketenes, XII [1] Synthesis and Structure of η5-C5H5(CO)2 [P(CH3)3]W-C≡C-C3H5

1983 ◽  
Vol 38 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Werner Sieber ◽  
Mathias Wolfgruber ◽  
Dietmar Neugebauer ◽  
Olli Orama ◽  
Fritz R. Kreißl
Keyword(s):  
Carbon Monoxide ◽  
Transition Metal ◽  
Spectroscopic Data ◽  
Reaction Conditions ◽  
X Ray ◽  
Acetylene Compound

Abstract Dicarbonyl(η5-cyclopentadienyl)(η1 -cyclopropylketenyl)(trimethylphosphane)tungsten reacts with carbon monoxide under reduction of the ketene moiety forming a (σ-bonded acetylene compound. Reaction conditions, spectroscopic data and the X-ray structure of the new compound are reported.

scholarly journals Übergangsmetallketen-Verbindungen, XXYI[1] Darstellung und Struktur eines Dekaboran(14)oxyalkin-Komplexes / Compounds of Transition Metal Ketenes, XXVI[1] Synthesis and Structure of a Decaboran(14)oxyalkyne Complex

1985 ◽  
Vol 40 (11) ◽  
pp. 1500-1503 ◽  
Author(s):  
Werner J. Sieber ◽  
Dietmar Neugebauer ◽  
Fritz R. Kreißl
Keyword(s):  
Transition Metal ◽  
Spectroscopic Data ◽  
Complex Reaction ◽  
Reaction Conditions ◽  
X Ray

Carbonyl(η5-cyclopentadienyl)(η2-4-methylphenylketenyl)trimethylphosphinetungsten reacts with decaborane(14) under conversion of the η2-ketenyl into a η2-alkyne complex. Reaction conditions, spectroscopic data and the X-ray structure of the new compound are reported.

scholarly journals A Simple, Efficient, and Eco-Friendly Method for the Preparation of 3-Substituted-2,3-dihydroquinazolin-4(1H)-one Derivatives

Molecules ◽  
2019 ◽  
Vol 24 (22) ◽  
pp. 4052 ◽  
Author(s):  
Zainab Almarhoon ◽  
Kholood A. Dahlous ◽  
Rakia Abd Alhameed ◽  
Hazem A. Ghabbour ◽  
Ayman El-Faham
Keyword(s):  
Molecular Structure ◽  
Cost Effective ◽  
Environmentally Benign ◽  
Conventional Heating ◽  
Second Step ◽  
The Novel ◽  
Monoclinic Crystal ◽  
X Ray ◽  
X Ray Crystallography ◽  
Cost Effective Method

A simple, cost-effective method under environmentally benign conditions is a very important concept for the preparation of 2,3-dihydroquinazolin-4(1H)-one derivatives. The present work describes an efficient and eco-friendly protocol for the synthesis of 2-amino-N-(2-substituted-ethyl)benzamide and 3-substituted-2,3-dihydroquinazolin-4(1H)-one derivatives. The novel feature of this protocol is the use of 2-methyl tetrahydrofuran (2-MeTHF) as an eco-friendly alternative solvent to tetrahydrofuran (THF) in the first step. In the second step, methanol in the presence of potassium carbonate as a catalyst was used under conventional heating or microwave irradiation, which provided an eco-friendly method to afford the target products in excellent yields and purities. NMR (1H and 13C), elemental analysis, and LC-MS confirmed the structures of all compounds. X-ray crystallography further confirmed the structure of the intermediate 2-amino-N-(2-substituted-ethyl)benzamide 3a. The molecular structure of 3a was monoclinic crystal, with P21/c, a = 13.6879 (11) Å, b = 10.2118 (9) Å, c = 9.7884 (9) Å, β = 105.068 (7)°, V = 1321.2 (2) Å3, and Z = 4.

Übergangsmetall-substituierte Diphosphene, XXVI Zum Einfluß des Ringliganden auf Bildungstendenz und Stabilität von Diphosphenyleisenkomplexen des Typs (η5-C5R5)(CO)2Fe-P= P-Mes (Mes = 2,4,6-tBu3C6H2). Röntgenstrukturanalyse von (η5-C5Me4Et)(CO)2Fe-P(SiMe3)2 / Transition Metal Substituted Diphosphenes, XXVI Investigations on the Influence of the Ring Ligand upon Formation and Stability of Diphosphenyl Complexes (η5-C5R5)(CO)2Fe-P=P-Mes (Mes = 2,4,6-tBu3C6H2). X-Ray Analysis of (η5-C5Me4Et)(CO)2Fe-P(SiMe3)2

1992 ◽  
Vol 47 (8) ◽  
pp. 1134-1140 ◽  
Author(s):  
Lothar Weber ◽  
Iris Schumann ◽  
Hans-Georg Stammler ◽  
Beate Neumann
Keyword(s):  
Molecular Structure ◽  
Transition Metal ◽  
Single Crystal ◽  
Elemental Analysis ◽  
Spectroscopic Data ◽  
Iron Complexes ◽  
X Ray

The disilylphosphido iron complexes (η5-C5R5)(CO)2Fe-P(SiMe3)2 (1b–d) result from the reaction of the corresponding bromo compounds (η5-C5R5)(CO)2FeBr with LiP(SiMe3)2 · 2 THF. The complexes 2b–d are cleanly converted into the diphosphenyl complexes (η5-C5R5)(CO)2Fe-P=P-Mes* (2b–d) by treatment with equimolar amounts of Mes*PCl2. The products 1b–d and 2b–d have been characterized by elemental analysis as well as spectroscopic data (IR, 1H, 13C, 31P NMR, MS). The molecular structure of η5-C5Me4Et)(CO)2Fe-P(SiMe3)2 (1b) has been established by single-crystal X-ray analysis.

scholarly journals New Piperazine Derivatives Synthesized from Thio-Substituted Polyhalogeno-2-nitro-1,3-butadienes

2010 ◽  
Vol 7 (4) ◽  
pp. 1498-1506 ◽  
Author(s):  
S. Goksin Aydinli ◽  
Cemil Ibis
Keyword(s):  
Single Crystal ◽  
Spectroscopic Data ◽  
The Novel ◽  
X Ray ◽  
Piperazine Derivatives ◽  
Bioactive Heterocycles ◽  
New Compounds

It is known that polyhalogeno-nitro-1,3-butadienes are important starting materials for the synthesis of polyfunctionalized bioactive heterocycles. NovelN,S-substituted nitrobutadienes (4a-j) were synthesized from the reaction of the monothio-substituted nitrodiene derivatives (2a) and (2b) with some piperazine derivatives. These new compounds are stable and the structures of these products were characterized by spectroscopic data. The structure of the novelN,S-substituted nitrodiene compound (4g) synthesized in this study was also elucidated by single crystal x-ray analysis.

scholarly journals Übergangsmetall-Methylen-Komplexe, X [1] Methylen-und Alkyl-Eisen-Komplexe aus Diazoalkanen. Molekülstruktur von μ-Carbonyl-μ-tert-butoxycarbonyl-methylen- bis [carbonyl(η5 -cyclopentadienyl)eisen] (Fe-Fe)/Transition Metal Methylene Complexes, X [1] Methylene and Alkyl Iron Complexes from Diazoalkanes. Molecular Structure of μ-Carbonyl-μ-tert-butoxycarbonyl-methylene- bis[carbonyl(η5-cyclopentadienyl)iron] (Fe-Fe)

1980 ◽  
Vol 35 (6) ◽  
pp. 680-688 ◽  
Author(s):  
Wolfgang A. Herrmann ◽  
Johann Plank ◽  
Ivan Bernal ◽  
Michael Creswick
Keyword(s):  
Molecular Structure ◽  
Low Temperature ◽  
Transition Metal ◽  
Mass Spectroscopy ◽  
Analytical Data ◽  
Iron Complexes ◽  
The Novel ◽  
X Ray Diffraction ◽  
X Ray ◽  
H Nmr

Abstract The novel doubly bridged μ-methylene iron complexes μ-[C(H)CO2R]-μ-CO[(η5-C5H5)Fe(CO)]2 (R = C2H5: 3a; R = tC4H9: 3b) have been synthesized by low-temperature photolysis of the corresponding alkyldiazoacetates 2a and 2b, resp., in the presence of [(η5-C5H5)Fe(CO)2]2 (1) and characterized by means of their analytical data and IR, 1H NMR and mass spectroscopy. The geometry of 3b has been established by single crystal X-ray diffraction techniques. δ-Alkyl iron complexes of the type (η5-C5H5)Fe(CO)2[CHRRʹ] are accessible from the corresponding diazoalkanes N2 = CRRʹ.

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