p-Tolylimido rhenium(v) complexes – synthesis, X-ray studies, spectroscopic characterization, DFT calculations and catalytic activity

Experimental and computational studies on a new mixed ligand oxido–rhenium(V) compound

“…Our computed IR frequency values are found to lie within 8% of the respective experimental values. This variation is justified because the theoretical values are based on calculations in the gas phase [10] . The calculated IR stretching frequencies of the Re=O and Tc=O units for our complexes 1p + -1x + and 2p + -2x + respectively, are also tabulated in Table S2.…”

Reactivity of [ReOCl3(PPh3)2] Towards Substituted Anilines

“…Previously, the crystal and molecular structures of rhenium(V) imido complexes shown in Figure 1 were reported. [18][19][20][21][22][23][24][25][26][27][28][29] The complexes [Re(p-NC 6 H 4 CH 3 )X 3 (PPh 3 ) 2 ] (X = Cl, Br) were used as starting materials or building blocks for the synthesis of a series of rhenium(V) p-tolylimido complexes [Re(p-NC 6 H 4 CH 3 )X 2 (N-O)(PPh pyridine-2-carboxylic acid, pyrazine-2-carboxylic acid, quinoline-2-carboxylic acid, 4-methoxyquinoline-2-carboxylic acid, isoquinoline-1-carboxylic acid and indazole-3-carboxylic acid [20,[30][31][32][33][34][35][36] or [Re(p-NC 6 H 4 CH 3 )X-(OMe)(NÀ O)(PPh 3 )]ReO 4 with neutral bidentate N,N-chelating ligands, such as 2,2'-dipyridylamine. [37] Moreover, the use of rhenium(V) compounds as homogeneous catalysts offers several advantages over other metal complexes.…”

“…With the ability of the rhenium metal center to assume different oxidation states, the insensitivity of its compounds towards air and moisture and ease of handling, catalytic applications of rhenium(V) complexes provide access routes to various value-added chemicals. [38,39] Therefore, it is not surprising that many rhenium(V) imido compounds were applied as catalysts in different organic transformations like amination of diazo esters, [33] oxidation of alkanes and hydrocarbons with peroxides, [34] or oxidation of alkanes and alcohols with tert-butyl hydroperoxide (TBHP). [35,36] In the context of the considerations mentioned above, a series of rhenium(V) imido complexes [Re(NR)Cl 3 (PPh 3 ) 2 ] were synthesized and characterized by elemental analysis, electrospray ionization high-resolution mass spectrometry, 1 H, 13 C{ 1 H}, 19…”

“…The complexes [Re( p ‐NC 6 H 4 CH 3 )X 3 (PPh 3 ) 2 ] (X=Cl, Br) were used as starting materials or building blocks for the synthesis of a series of rhenium(V) p ‐tolylimido complexes [Re( p ‐NC 6 H 4 CH 3 )X 2 (N‐O)(PPh 3 )] with uninegative bidentate N , O ‐chelating ligands such as 2‐hydroxymethylbenzimidazole, 2‐(2‐hydroxyphenyl)‐1H‐benzimidazole, 2‐(2‐hydroxyphenyl)benzoxazole, 2‐(2‐hydroxyphenyl)benzothiazole, 2‐(2′‐hydroxy‐5′‐methylphenyl)benzotriazole), pyridine‐2‐carboxylic acid, pyrazine‐2‐carboxylic acid, quinoline‐2‐carboxylic acid, 4‐methoxyquinoline‐2‐carboxylic acid, isoquinoline‐1‐carboxylic acid and indazole‐3‐carboxylic acid [20,30–36] or [Re( p ‐NC 6 H 4 CH 3 )X(OMe)(N−O)(PPh 3 )]ReO 4 with neutral bidentate N , N ‐chelating ligands, such as 2,2′‐dipyridylamine [37] …”