(Phosphinoalkyl)silyl complexes. 3. "Chelate-assisted" hydrosilylation: formation of enantiomeric and diastereoisomeric iridium(III) complexes with chelating (phosphinoethyl)silyl ligands
作者:Mary J. Auburn、Rupert D. Holmes-Smith、Stephen R. Stobart
DOI:10.1021/ja00317a024
日期:1984.3
La reaction de trans-[Ir (PPh 3 ) 2 (CO) Cl] avec les silanes fonctionnalises PPh 2 CH 2 CH 2 SiR 1 R 2 H donne des composes d'additions d'Ir (III). A l'un d'eux on attribue la structure: [rac-carbonychlorohydruro (diphenylphosphino)-2 ethyl) dimethylsilyl] (PPh 3 )Ir]
La 反应反式-[Ir (PPh 3 ) 2 (CO) Cl] avec les 硅烷功能化 PPh 2 CH 2 CH 2 SiR 1 R 2 H donne des 组成 d'additions d'Ir (III)。A l'un d'eux on attribue la结构:[外消旋-羰基氯氢(二苯基膦)-2乙基)二甲基甲硅烷基](PPh 3 )Ir]
Intramolecular rearrangement behaviour of a dihydridoiridium (<scp>III</scp>)complex for med by regiospecific ‘chelate-assisted’ hydrosilylation
作者:Mary J. Auburn、Stephen R. Stobart
DOI:10.1039/c39840000281
日期:——
Addition of PPh2CH2CH2SiMe22H to [IrH(CO)](PPh3)3}is regiospecific as evidenced by formation of a cis adduct [I[graphic omitted]Me2)(CO)(PPh3)(H)(2H)]in which 2H nuclei are initially restricted to a single co-ordination position; subsequent rearrangement whereby 2H becomes equally distributed among the two hydridic sites is intramolecular with ΔG‡298= 19.3 ± 3.2kcal mol–1(1kcal = 4.184kJ).
Treatment of HSiMe2Ph with a square-planar rhodium(I) complex Rh[(κ2-Si,P)-Me2SiCH2CH2PPh2](Pme3)2 gave rise to selective dehydrogenative coupling of hydrosilanes to afford (SiMe2Ph)2 and RhH2[(κ2-Si,P)-Me2SiCH2CH2PPh2](Pme3)2.
Transition Metal Silyl Complexes. 53.<sup>1</sup> Magnitude of the Chelate Effect in the Oxidative Addition of Si−H Bonds
作者:Ulrich Schubert、Hilmar Gilges
DOI:10.1021/om9600598
日期:1996.4.30
The chelatecomplexes (CO)4W(Ph2PCH2CH2SiHR2) (R = Me, Ph), containing W,H,Si three-center two-electron bonds, were photochemically prepared from W(CO)6 and Ph2PCH2CH2SiR2H. The phosphinecomplexes (CO)5W(Ph2PCH2CH2SiR2H) are intermediates in this reaction. The high NMR couplingconstants JSiWH in the chelatecomplexes (98.1 and 95.2 Hz) indicate that due to the chelating situation an earlier stage
Phosphinoalkylsilyl complexes. Part 7. Synthesis and reactivity of octahedral, bis(chelate)dicarbonyl complexes of ruthenium(II) and osmium(II). Conformational properties of the bis(chelate) framework and X-ray crystal structures of [M(PPh2CH2CH2SiMe2)2(CO)2](M = Ru or Os)
作者:Rupert D. Holmes-Smith、Stephen R. Stobart、Rahmatollah Vefghi、Michael J. Zaworotko、Klaus Jochem、T. Stanley Cameron
DOI:10.1039/dt9870000969
日期:——
R1= Me, R2= Ph) with [M3(CO)12](M = Ru or Os) at 140 °C affords the octahedral complexes [M(PPh2CH2CH2SiR1R2)2(CO)2] for which i.r. and n.m.r. data suggest a common structure with transCO groups. The Ru complex in which R1= R2= Me is chemically inert, failing to undergo carbonyl displacement or to show evidence for either nucleophilic or electrophilic attack on co-ordinated CO [a characteristic which
膦酰基乙基硅烷Ph 2 PCH 2 CH 2 SiR 1 R 2 H(R 1 = R 2 = Me或Ph; R 1 = Me,R 2 = Ph)与[M 3(CO)12 ](M = Ru或Os)在140°C时提供八面体络合物[M(PPh 2 CH 2 CH 2 SiR 1 R 2)2(CO)2 ],其ir和nmr数据表明具有反式CO基团的共同结构。R 1 = R 2的Ru络合物= Me是化学惰性的,无法进行羰基置换或显示出对配位CO的亲核或亲电攻击的证据[该特征可能与ν(CO)(约1 920 cm –1的低能量有关)),这可能是由于感应电子从Si释放到Ru]上,但在沸腾的CCl 4或与HCl气体或I 2中发生反应,两个Ru-Si键均断裂。OS的晶体和分子结构复杂,其中R 1 = R 2 =我已被确定X射线衍射,显示出螯合配体采取顺赤道平面上的关系;在该结构中,两个构象异构体共存于晶体中,其特