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• W2023171933 startingPage "652" @default.
• W2023171933 abstract "A series of terminal Pt(II) phosphido complexes Pt(dppe)(Me)(PRR‘) (R = H; R‘ = Mes* (1), R‘ = Mes (2), R‘ = Ph (3), R‘ = Cy (4); R = R‘ = Mes (5); R = R‘ = Ph (6); R = R‘ = Cy (7); R = R‘ = Et (8); R = Ph, R‘ = i-Bu (9)) has been prepared by proton transfer from the appropriate phosphine to the methoxide ligand of Pt(dppe)(Me)(OMe) (10) (dppe = Ph2PCH2CH2PPh2; Mes* = 2,4,6-(t-Bu)3C6H2; Mes = 2,4,6-Me3C6H2; Cy = cyclo-C6H11). Complexes 1 and 2 were also made by deprotonation of the cations [Pt(dppe)(Me)(PH2Ar)][BF4] (Ar = Mes* (13); Ar = Mes (14)). For comparison to 1, the arylthiolate and aryloxide complexes Pt(dppe)(Me)(EMes*) (E = S (11); E = O (12)) were also prepared from 10. NMR studies of the proton-transfer equilibria between Pt(dppe)(Me)(X), Pt(dppe)(Me)(Y), and the acids HY and HX (see Bryndza, H. E.; Fong, L. K.; Paciello, R. A.; Tam, W.; Bercaw, J. E. J. Am. Chem. Soc. 1987, 109, 1444−1456 and Bryndza, H. E.; Domaille, P. J.; Tam, W.; Fong, L. K.; Paciello, R. A.; Bercaw, J. E. Polyhedron 1988, 7, 1441−1452) provide an approximate partial ranking of Pt−P bond strengths in this series: Pt−PHPh > Pt−PHMes > Pt−PHMes*; Pt−PPh2 > Pt−PMes2. Complementary solution calorimetry investigations probe the role of entropic effects on the equilibria. Both steric and electronic factors appear to be important in controlling relative Pt−P bond strengths. The Pt−S bonds in 11 and Pt(dppe)(Me)(SPh) are stronger than the analogous Pt−P bonds in 1 and 3. Complexes 1 and 5·THF were structurally characterized by X-ray crystallography." @default.
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• W2023171933 date "1998-01-30" @default.
• W2023171933 modified "2023-10-10" @default.
• W2023171933 title "Terminal Platinum(II) Phosphido Complexes: Synthesis, Structure, and Thermochemistry" @default.
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• W2023171933 doi "https://doi.org/10.1021/om9708891" @default.
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