Preparation and structure of oxo-rhenium(V) complexes with 7-azaindole

Lebuis, Anne‐Marie; Beauchamp, André L.

doi:10.1139/v93-256

Cited by 32 publications

(18 citation statements)

References 27 publications

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“…The signals are assigned as described earlier (15), using the coupling constants to identify H4 and H6. Coordination to N7 results in downfield shifts on most of the protons, as recently found for Re complexes (19). The largest displacements occur for H4 and H5 (+0.54 and +0.39 ppm, respectively), whereas the H6 proton, close to the coordination site, is barely affected (-0.02 ppm).…”

Section: Nmr Spectroscopysupporting

confidence: 73%

“…N7-C6 coupling does not appreciably affect bond lengths and angles in the azaindolyl unit, but greater differences are found in the azaindolium ring (14). The bond lengths are increased by -0.02 A in the C(16)-N(17)-C(18)-C (19) region, whereas N(l1)-C (18) is shortened by the same amount. Also, the angle at N(17) in the six-membered ring increases by 3.0°, those at C(16) and C(18) decrease by 2.3 and 4.3", respectively, whereas remote angles undergo smaller changes keeping the ring roughly planar: +IS0, C(19); +2.1°, C(1.5).…”

Section: Reactants and Techniquesmentioning

confidence: 79%

“…The ligand two-ring system is planar: the mean atom-to-plane distance (0.0!2 A) corresponds to l a with the largest deviation (0.023(10) A) found for N(7) (Table S-4)3. The azaindole ring making a -45" angle with the Cl(2)-Nb(1)-Cl (3) and Cl(1)-Nb(1)-Cl(4) directions, the N(1)-H proton can form a bifurcated intramoleculfir hydrogen bond with equatorial chlorines, as observed for ReOC13(Haza)2 and ReOC13(Haza)(PPh3) (19). The N(1)-Cl (1) and N(1)-.C1(3) separations of 3.19 and 3.32 A, respectively (Table s- (Fig.…”

Section: Reactants and Techniquesmentioning

confidence: 83%

“…The formally neutral 7-azaindole ligands is bonded via N7. The distances and angles in coordinated azaindole (Table 5) show no significant differences with those found in free azaindole and other complexes containing monodentate N7-bonded azaindole (14,16,(18)(19)(20). The ligand two-ring system is planar: the mean atom-to-plane distance (0.0!2 A) corresponds to l a with the largest deviation (0.023(10) A) found for N(7) (Table S-4)3.…”

Section: Reactants and Techniquesmentioning

confidence: 87%

“…Monodentate coor-H I dination can also occur with both the anionic and the neutral forms (14)(15)(16)(17)(18)(19)(20). When protonated, the resulting H,aza+ cation simply acts as counter ion (20,21).…”

Section: Introductionmentioning

confidence: 99%

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Reactions of 7-azaindole with niobium and tantalum pentachlorides and coupling to the azaindolyl-azaindolium cation

Poitras¹,

Beauchamp²

1994

Can. J. Chem.

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JACQUES POITRAS and AND& L. BEAUCHAMP. Can. J. Chem. 72, 1675Chem. 72, (1994. The reaction of NbC1, and TaC1, with 7-azaindole (Haza) at room temperature in benzene or dichloromethane yielded MCl,(Haza) addition compounds. Under more severe conditions, the same compound was obtained with TaCl,. For NbCl,, some reduction to Nb(IV) was observed and NbCI,(Haza), NbCI,(Haza),, and the (H,aza)' ion were identified in the reaction mixture by infrared spectroscopy. Oxidative coupling of two azaindole units via N7-C6 also took place during the reaction, since the 7-(azaindol-6-y1)azaindolium cation was found as counter-ion in the crystal structures of two complex salts. In the crystals of

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Section: Nmr Spectroscopysupporting

confidence: 73%

Section: Reactants and Techniquesmentioning

confidence: 79%

Section: Reactants and Techniquesmentioning

confidence: 83%

Section: Reactants and Techniquesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Reactions of 7-azaindole with niobium and tantalum pentachlorides and coupling to the azaindolyl-azaindolium cation

Poitras¹,

Beauchamp²

1994

Can. J. Chem.

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Oxidorhenium(V) Complexes with Oxazolinylmethoxido Ligands – Structure and Catalytic Epoxidation

et al. 2011

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Reaction of [ReOCl 3 (PPh 3 ) 2 ] with (4,5-dihydrooxazol-2-yl)-methanol and three methyl-substituted derivatives thereof (2a-2d) in boiling acetone or tetrahydrofuran gave oxidorhenium(V) complexes of the type [ReOCl 2 (PPh 3 )(2a-2d)] (3a-3d) as blue crystalline materials in good yields. The complexes were characterized by 1 H, 13 C, 31 P NMR and IR spectroscopy, mass spectrometry, elemental analysis and singlecrystal X-ray diffraction analysis. All the complexes showed distorted octahedral geometries and were found to contain

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Rhenium(IV) and rhenium(V) complexes with 3,5-dimethylpyrazole

et al. 2006

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Mono and dinuclear Re IV and Re V complexes with 3,5 dimethylpyrazole (Me 2 pzH) were synthesized. The cis [Re 2 O 3 Cl 4 (3,5 Me 2 pzH) 4 ] complex (cis 1) was prepared by the reaction of NH 4 ReO 4 with K[HB(Me 2 pz) 3 ] in concentrated HCl or by refluxing of [ReCl 3 (MeCN)(PPh 3 ) 2 ] with Me 2 pzH in air. The bromide complex trans [Re 2 O 3 Br 4 (3,5 Me 2 pzH) 4 ] (trans 2) was synthesized by passing dry HBr through a solution of [Re 2 O 3 Br 2 (µ 3,5 Me 2 pz) 2 (3,5 Me 2 pzH) 2 ] (4) in chloroform. The pyrazolate bridged complex [Re 2 O 3 Cl 2 (µ 3,5 Me 2 pz) 2 (3,5 Me 2 pzH) 2 ] (3) was prepared from (Et 4 N) 2 [ReOCl 5 ] or Cs 2 [ReOCl 5 ] and Me 2 pzH. The corresponding bromide and iodide complexes [Re 2 O 3 X 2 (3,5 Me 2 pz) 2 (3,5 Me 2 pzH) 2 ]•C 6 H 6 (X = Br (4) or I (5)) were synthesized by the reactions of (NH 4 ) 2 [ReBr 6 ] or K 2 [ReI 6 ], respectively, with Me 2 pzH. The [ReO(OMe)(3,5 Me 2 pzH) 4 ]Br 2 • •3,5 Me 2 pzH•4H 2 O complex (6) was obtained as a by product in the synthesis of complex 4. The reaction of [ReNCl 2 (PPh 3 ) 2 ] with Me 2 pzH was accompanied by hydrolytic denitration giving rise to the mixed ligand complex [Re 2 O 3 Cl 2 (µ 3,5 Me 2 pz) 2 (3,5 Me 2 pzH)(PPh 3 )] (7). The reaction of (NH 4 ) 2 [ReBr 6 ] with a Me 2 pzH melt gave the trans [ReBr 4 (3,5 Me 2 pzH) 2 ]• •Me 2 CO complex (8). The structures of complexes 2 and 4-8 were established by X ray diffraction. All compounds were characterized by elemental analysis, electronic absorption spectroscopy, 1 H NMR and IR spectroscopy, mass spectrometry, and cyclic voltammetry.

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Preparation and structure of oxo-rhenium(V) complexes with 7-azaindole

Cited by 32 publications

References 27 publications

Reactions of 7-azaindole with niobium and tantalum pentachlorides and coupling to the azaindolyl-azaindolium cation

Reactions of 7-azaindole with niobium and tantalum pentachlorides and coupling to the azaindolyl-azaindolium cation

Oxidorhenium(V) Complexes with Oxazolinylmethoxido Ligands – Structure and Catalytic Epoxidation

Rhenium(IV) and rhenium(V) complexes with 3,5-dimethylpyrazole

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