Synthesis and Structure of N-Heterocyclic Carbene Complexes of Germanium(II)
摘要:
The synthesis and structural characterization of a series of N-heterocyclic carbene (NHC) complexes of GeR1R2 are reported, where R-1 = R-2 = Mes (Mes = 2,4,6-trimethylphenyl) (1), R-1 = R-2 = F (5), R-1 = R-2 = Br (6), R-1 = Cl, R-2 = OTf (OTf = O3SCF3) (7), R-1 = R-2 = (OBu)-Bu-t (10), and R-1 = R-2 = NCS (11). The bond length between the carbenic carbon and the germanium is observed to vary in accordance with the pi-donating ability of the substituent on Ge. Efforts to synthesize stable complexes with small alkyl or aryl substituents were not successful; evidence for oligomerization of the GeR2 fragment is presented. The reaction between 1 and 3 (R-1 = R-2 = Cl) resulted in the formation of an NHC-coordinated germylgermylene (13). The H-1 NMR spectra of 3-7, 10, and 11 display broad signals at room temperature. To rationalize the H-1 NMR spectra, mechanisms for conformational interchange, as well as intermolecular exchanges, are discussed.
Oxidatively Induced Reductive Elimination from a Chromium(III) Bis(aryl) Complex
作者:K. Cory MacLeod、Brian O. Patrick、Kevin M. Smith
DOI:10.1021/om300751z
日期:2012.9.24
investigated as precursors to CpCr(III) complexes. Single-electron oxidation of 1 was used to prepare CpCr(C6H4CH2NMe2)(X) for X = I (3), OTs (4), O2CPh (5), OCMe2Ph (6), SPh (7). Similarly, CpCr[C(Ph)C(Ph)C6H4CH2NMe2](X) for X = I (8), SPh (9) were obtained from 2. Reactions of 4 with PhCH2MgCl or Mg(C6H4Me)2 reagents gave the Cr(III) benzyl (10) and p-tolyl (11) complexes, respectively. The corresponding
Halo, Alkyl, Aryl, and Bis(imido) Complexes of Niobium Supported by the β-Diketiminato Ligand
作者:Neil C. Tomson、John Arnold、Robert G. Bergman
DOI:10.1021/om1001827
日期:2010.7.12
by treatment with B(C6F5)3, affording the Lewis base-free complexes (BDI)Nb(NtBu)X2 (X = Cl, F). Additionally, the Lewis base-free dichlorides of the tBu-imido and Ar-imido (Ar = 2,6-iPr2-C6H3) complexes were obtained following treatment of Nb(NR)Cl3(dme) (R = tBu, Ar) with Li(BDI)(OEt2). The pyridine-coordinated dichloride was alkylated and arylated to form the dimethyl complex (BDI)Nb(NtBu)Me2 (described
复合物 (BDI)Nb(N t Bu)Cl 2 py (BDI = HC[C(Me)N( 2,6 - i Pr 2 -C 6 H 3 )] 2 ) 以高产率合成用Li(BDI)(OEt 2 )处理Nb(N t Bu)Cl 3 py 2。通过在甲苯中引入 2.0 当量的 Me 3 SnF 来实现氯化物对氟化物的取代,以中等产率提供吡啶配位的二氟化物络合物 (BDI)Nb(N t Bu)F 2 py。通过用 B(C 6 F5 ) 3,提供路易斯无碱配合物(BDI)Nb(N t Bu)X 2 (X = Cl,F)。此外,在处理 Nb(NR)Cl 3 (dme) 后,获得了t Bu-imido 和 Ar-imido (Ar = 2,6 - i Pr 2 -C 6 H 3 ) 配合物的无路易斯碱二氯化物( R = t Bu, Ar) 和 Li(BDI)(OEt 2 )。吡啶配位的二氯化物被烷基化和芳基化以形成二甲基络合物
Binuclear alkynylplatinum(II) complexes
作者:Richard J. Puddephatt、Mary A. Thomson
DOI:10.1016/s0022-328x(00)84806-8
日期:1982.10
Synthesis and Structure of N-Heterocyclic Carbene Complexes of Germanium(II)
作者:Paul A. Rupar、Michael C. Jennings、Kim M. Baines
DOI:10.1021/om800368d
日期:2008.10.13
The synthesis and structural characterization of a series of N-heterocyclic carbene (NHC) complexes of GeR1R2 are reported, where R-1 = R-2 = Mes (Mes = 2,4,6-trimethylphenyl) (1), R-1 = R-2 = F (5), R-1 = R-2 = Br (6), R-1 = Cl, R-2 = OTf (OTf = O3SCF3) (7), R-1 = R-2 = (OBu)-Bu-t (10), and R-1 = R-2 = NCS (11). The bond length between the carbenic carbon and the germanium is observed to vary in accordance with the pi-donating ability of the substituent on Ge. Efforts to synthesize stable complexes with small alkyl or aryl substituents were not successful; evidence for oligomerization of the GeR2 fragment is presented. The reaction between 1 and 3 (R-1 = R-2 = Cl) resulted in the formation of an NHC-coordinated germylgermylene (13). The H-1 NMR spectra of 3-7, 10, and 11 display broad signals at room temperature. To rationalize the H-1 NMR spectra, mechanisms for conformational interchange, as well as intermolecular exchanges, are discussed.
Preparation of solvated and/or unsolvated simple and mixed diarylmagnesiums