Children learn through play, and they learn more than adults might expect. Science experiments are a great way to spark their curiosity, get their minds active, and encourage them to do something that doesn’t involve a screen. 33100-27-5, C10H20O5. A document type is Article, introducing its new discovery., Safety of 1,4,7,10,13-Pentaoxacyclopentadecane
The insoluble calcocene Ca(eta5-C5H 5)2 readily dissolves after addition of Lewis bases. Monodentate donor solvents such as tetrahydrofuran (thf), pyridine (py), and tetrahydropyran (thp) form complexes of the type [(L)2CaCp 2] (L = thf (1), py (2), thp (4)). Bidentate Lewis bases such as 1,2-bis(dimethylamino)ethane (tmeda) and 1,2-dimethoxyethane (dme) act as chelating ligands in complexes of the type [(L)CaCp2] (L = tmeda (3), dme (5)). Multidentate ethers of the type MeO-(CH2CH 2O)n-Me (n = 2, diglyme; n = 3, triglyme; n = 4, tetraglyme) bind in all cases as tridentate Lewis bases of the type [(eta3-L)CaCp2] (L = diglyme (6), triglyme (7), tetraglyme (8)), but the formation of [(L)CaCp]+ cations with these ethers or even with crown ethers was not observed. However, partial hydrolysis of 1 releases one Cp ligand, and from this reaction mixture crystalline [(15C5)CaCp]+[(thf)CaCp3]- (9) precipitates in the presence of 15-crown-5 (15C5). Calcocene behaves as a pseudohalide complex of calcium, and the reaction of 1 or 5 with phenyllithium in the presence of DME yields heteroleptic [(dme)(eta5-Cp)Ca(mu-Ph)]2 (10), which forms a dimer with bridging phenyl groups in the solid state. Especially this last reaction offers an expansion of organocalcium chemistry.
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