A simple and effective preparation of (η-RC5H4)2M2(CO)6 complexes (M  Cr, Mo, and W)

Oxidation of Magnesium, Indium, and Thallium with Molybdenum and Cobalt Binuclear Carbonyl Complexes in Polar Solvents

“…According to the results of spectrophotometric analysis using the extinction coefficients of IV at analytical wavelengths [19], the main substance content in this sample was 98.7%. Compound II was prepared according to [20]. Its decomposition point was 217oC (published data [21]: decomposition point 216oC).…”

Synthesis and Characterization of Cubane‐Like Cr4E4 (E = S, Se) Clusters − Molecular Structures of (η5‐RC5H4)4Cr4E4 (E = S, R = MeCO, MeO2C, EtO2C; E = Se, R = H)

“…Commercial sulfur powder, selenium powder, and 2,4-dinitrophenylhydrazine were used as received. [η 5 -RC 5 H 4 Cr(CO) 3 ] 2 (where R ϭ Me, [16] MeCO, [12] MeO 2 C, [12] EtO 2 C [13] ), [CpCr(CO) 2 ] 2 Se [18] and [η 5 -MeC(O)C 5 H 4 Cr(CO) 2 ] 2 Se [4] were prepared according to literature procedures. All reactions were monitored by thin layer chromatography (TLC) at intervals.…”

“…In this paper we report the synthesis and spectroscopic characterization of a series of cubane Cr 4 E 4 clusters (E ϭ S, Se), (η 5 (16, n = 0; 17, n = 1; 18, n = 2; 19, n = 3; 20, n = 4). The possible pathway for the cross-assembled reaction is suggested.…”

“…Similarly to clusters 4 and 5, [14] the IR spectra of 6 and 7 showed one absorption band at 1708 and 1616 cm Ϫ1 for the ester CϭO and hydrazone CϭN groups, while the 1 H NMR spectra of 6 and 7 displayed two singlets at lower and higher fields, attributed respectively to H 2 /H 5 and H 3 /H 4 protons in the functionally substituted Cp rings. [15] When the CrϪCr singly-bonded dimers [η 5 -RC 5 H 4 Cr(CO) 3 ] 2 (8, R ϭ Me; [16] 9, R ϭ EtO 2 C [13] ) were refluxed with an equimolar amount of elemental selenium in THF for 8 h or when the linear complexes [η 5 -RC 5 H 4 Cr(CO) 2 ] 2 Se (10, R ϭ Me; [17] 11, R ϭ EtO 2 C [17] ) were treated with an equimolar quantity of selenium in refluxing THF for 8 h, the corresponding cubane Cr 4 Se 4 clusters 12 and 13 were obtained in excellent yield (see Scheme 3). [4] and its parent complex [CpCr(CO) 2 ] 2 Se (15) [18] were treated with elemental selenium in refluxing THF for 8 h, a series of Cr 4 Se 4 cubane clusters with the general formula [η 5 -MeC(O)C 5 H 4 ] n Cp 4Ϫn Cr 4 Se 4 (16؊20, n ϭ 0Ϫ4) were produced in total 97 % yield (see Scheme 4).…”

A new approach to coordination chemistry involving phosphorus-selenium based ligands. Ring opening, deselenation and phosphorus–phosphorus coupling of Woollins’ Reagent

“…1,3,2,4-Dithiadiphosphetane 2,4-diselenides (Woollins' Reagent) was purchased from Sigma-Aldrich. [CpCr(CO) 3 ] 2 was synthesized as described by Manning and co-workers [33] from chromium hexacarbonyl (99% purity from Sigma). 6 (1) with an equivalent of Woollins' reagent at ambient temperature A deep green suspension of Cp 2 Cr 2 (CO) 6 (1) (200 mg, 0.497 mmol) in toluene ($15 mL) was added WR (264 mg, 0.497 mmol) and the mixture stirred at ambient temperature.…”