Unexpected P−Si or P−C Bond Cleavage in the Reaction of Li<sub>2</sub>[(C<sub>5</sub>Me<sub>4</sub>)SiMe<sub>2</sub>PR] (R = Cyclohexyl, 2,4,6-Me<sub>3</sub>C<sub>6</sub>H<sub>2</sub>) and Li[(C<sub>5</sub>H<sub>4</sub>)CMe<sub>2</sub>PHR] (R = Ph, <sup>t</sup>Bu) with ZrCl<sub>4</sub> or [TiCl<sub>3</sub>(thf)<sub>3</sub>]: Formation and Molecular Structure of the <i>ansa</i>-Metallocenes [{(η-C<sub>5</sub>Me<sub>4</sub>)<sub>2</sub>SiMe<sub>2</sub>}ZrCl<sub>2</sub>] and [{(η-C<sub>5</sub>H<sub>4</sub>)<sub>2</sub>CMe<sub>2</sub>}MCl<sub>2</sub>] (M = Ti, Zr)
作者:Thomas Koch、Steffen Blaurock、Fernando B. Somoza、Andreas Voigt、Reinhard Kirmse、Evamarie Hey-Hawkins
DOI:10.1021/om990763z
日期:2000.6.1
in these reactions was shown by 31P NMR spectroscopy. In the reaction of Li[(C5H4)CMe2PHR] (R = Ph (3), tBu (4)) with ZrCl4 or [TiCl3(thf)3], [(η-C5H4)CMe2PHR}2ZrCl2] (R = Ph (6), tBu (7)) and [(η-C5H4)CMe2PHR}2TiCl] (R = Ph (9), tBu (10)) are formed. 6, 7, 9, and 10 slowly decompose on recrystallization from thf, Et2O, or toluene with formation of [(η-C5H4)2CMe2}MCl2] (M = Zr (8), Ti (11)). The
(膦基硅烷基)环戊二烯1-SiMe 2 PHMes-2,3,4,5-Me 4 C 5 H,由1-SiMe 2 Cl-2,3,4,5-Me 4 C 5 H和LiPHMes(Mes = 2,4,6-Me 3 C 6 H 2),与MeLi反应生成Li 2 [(C 5 Me 4)SiMe 2 PMes](2)。(膦基甲基)环戊二烯Li [(C 5 H 4)CMe 2 PH t Bu](4)通过LiPH t Bu与6,6-二甲基富烯的反应获得。里2 [(C 5我4)森达2 PR](R =环己基(CY; 1),MES(2)),其与使用ZrCl原位发生反应4在-30℃,得到[(η-C 5我4)2 SiMe 2 } ZrCl 2 ](5)。这些反应中(PCy)4和(PHMes)2的形成分别通过31 P NMR光谱显示。在Li [(C 5 H 4)CMe 2 PHR](R = Ph(3),t Bu(4)),与使用ZrCl