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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. 1038-95-5, C21H21P. A document type is Article, introducing its new discovery., Formula: C21H21P
Pentacarbonyl<(dimethyloxosulfonio)methanide>chromium(O), (CO)5Cr (1), reacts with tertiary phosphanes PR3 (2) (R = Ph, C6H4OMe-(p), C6H4Me-(p), C6H4Cl-(p)) to give pentacarbonyl(phosphonium ylide)chromium(O) complexes, (CO)5Cr (3), and dimethylsulfoxide according to the first-order rate law.The reaction rate is independent of the type of the phosphane.The activation parameters for the reaction in 1,1,2-trichloroethane in the temperature range 39.6 to 68.0 deg C are DeltaH% = 28.1 kcal * mol-1 and DeltaS% = 12.7 cal * mol-1 * K-1.The reaction is ini tiated by irreversible dissociation of OSMe2 from 1.Addition of 2 to the carbene carbon of the resulting pentacarbonylmethylenechromium, <(CO)5Cr=CH2>, yields 3 in a fast succeeding step.A mechanism involving rate determining dissociation of the Cr = CH2 bond can be excluded.These results represent the first evidence of a neutral, electrophilic carbonylmethylene complex.
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Reference：
Phosphine ligand,
Chiral phosphine ligands in asymmetric synthesis. Molecular structure and absolute configuration of (1,5-cyclooctadiene)-(2S,3S)-2,3-bis(diphenylphosphino)butanerhodium(I) perchlorate tetrahydrofuran solvate