Chemical Properties of Tetragermaplatinacyclopentane. Insertion of an Alkyne into a Pt–Ge Bond and Silylation Caused by H2SiPh2
摘要:
A platinum complex having dibutylgermyl ligands, [Pt(GeHBu2)(2)(dmpe)] (dmpe = 1,2-bis(dimethylphosphino)ethane), reacted with excess H-2 GeBu2 at 90 degrees C to yield a five-membered tetragermaplatinacycle, [Pt(GeBu(2)GeBu(2)GeBu(2)G au(2))(dmpe)] (6). The direct reaction of H2GeBu2 with [Pt(dmpe)(2)] in 5:1 ratio also gave 6 in 67% yield. The reaction of dimethyl acetylenedicarboxylate with 6 caused insertion of a C C bond into a Pt-Ge bond to form a seven-membered germaplatinacycloheptene, which was characterized by X-ray crystallography. Complex 6 reacted with H2GePh2 and H2SiPh2 in 1:2 ratio to produce a mixture of tetragermane dihydride H(GeBu2)(4)H and bis(silyl)-or bis(germyl)platinum complexes [Pt(EHPh2)(2)(dmpe)] (E = Si, Ge).
Methods for the selective chlorination of organogermylhydrides are given by the selective functionalization of organogermylhydrides of types R3GeH, R2GeH2 and RGeH3 (R = alkyl, aryl). The use of trichloroisocyanuric acid (TCCA) allows the direct conversion of Ge‐H functions into their monochlorinated derivatives R2Ge(Cl)H and RGe(Cl)H2.
The Thermal Reactions of Allyl-substituted Germyl Radicals
作者:Kunio Mochida、Isoo Miyagawa
DOI:10.1246/bcsj.56.1875
日期:1983.6
The allyldibutylgermyl and dibutyl(2-methylallyl)germyl radicals in benzene at 80 °C afforded diallyldibutylgermane and dibutylgermane, and dibutylbis(2-methylallyl)germane and dibutylgermane, respectively. The mechanism of these reactions is discussed.
Homolytic hydrogermylation of alkenes with dibutylchlorogermane
作者:Katsukiyo Miura、Kazunori Ootsuka、Akira Hosomi
DOI:10.1016/j.jorganchem.2006.04.043
日期:2007.1
In the presence of Et3B-dry air, dibutylchlorogermane (Bu2GeClH) reacted smoothly with alkenes at room temperature to give hydrogermylation products in high yields. This homolytic hydrogermylation was applicable to various alkenes including electron-deficient, electron-rich, and internal alkenes. Under the same conditions, tributylgermane (Bu3GeH) showed much lower reactivity than Bu2GeClH. The Et3B-initiated reaction of 1,6-dienes with Bu2GeClH gave germylmethylated cyclopentanes. (c) 2006 Elsevier B.V. All rights reserved.
Catalytic Synthesis of Cyclic and Linear Germoxanes Mediated by an Iron Complex
Six-membered cyclic germoxanes (R2GeO)(3) were selectively prepared via the thermal reaction of (alkyl)(2)-GeH2 in dimethylformamide (DMF). Linear metallagermoxanes with an E-O-Ge-O-E backbone (E = Si, Ge, Sn) were prepared by the reaction of Ph2GeH2 with R3EH in DMF. Their cyclic and linear germoxane formations were achieved using an iron catalyst, (eta(5)-C5H5)Fe(CO)(2)Me. An iron carbene complex was proposed to be an intermediate in the catalytic reaction.
Cationic Hydridotriplatinum Complex with Bridging Germylene Ligands
Triplatinum complexes with bridging secondary germylene ligands, [(Pt(PMe3)}(3)(mu-GeR2)(3)] (R = Ph, Bu-n), were prepared from the reaction of H2GeR2 with [Pt(PMe3)4] in a 1:1 ratio. Protonation of the triplatinum complexes with HBF4 led to formation of the cationic hydride complexes [Pt(PMe3)}(3)(mu-GeR2)(3)(mu(3)-H)D3F4 (R = Ph, Bu-n). The results of multinuclear NMR spectra and DFT calculations of the cationic complexes revealed that the Pt3H core has a trigonal-pyramidal structure with rapid exchange of the mu(3)-hydride ligand position between the two possible positions on the opposite side of the Pt-3 plane.