Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Gold-phosphine fragments

The yields of these reactions are often improved by the addition of thallium(I) or silver(I) salts to act as halide scavengers and so generate the gold phosphine fragment in situ. This modification has been most extensively utilized in the addition of Au(PR3)+ to anionic and neutral cluster compounds, and a number of examples are given below ... [Pg.329]

Other reagents that have been used as sources of the gold phosphine fragment include [Au(PMe2Ph)2]+ (79,192) and [(AuPPh3)30] + ... [Pg.331]

The addition of gold phosphine fragments to transition metal compounds is readily extended to include reactions of heteronuclear gold cluster compounds and has been used to build up clusters of increasing nuclearity, as the following examples illustrate ... [Pg.334]

In contrast to the above reactions, a gold phosphine fragment can often be readily removed from a heterometallic cluster by the addition of free phosphine. This can result in degradation to novel heterometallic clusters containing fewer gold atoms,... [Pg.336]

The gold phosphine fragment has also been abstracted from heteronuclear cluster compounds as Au(PR3)X by reaction with halide ions... [Pg.336]

The gold phosphine fragment has been used extensively as a cluster building unit and numerous examples of AuPR3 groups bridging metal-metal bonds have been structurally characterized, in which the gold moieties exhibit /i,2- and -coordination modes. Tables V and VI... [Pg.353]

Unlike the situation for species containing a single Au(PR3) unit (Section cases of gold-phosphine fragments occupying similar posi-... [Pg.278]

In the reactions described above, only the AuPR3 fragment of the gold phosphine precursor has added to the cluster. Oxidative addition of Au(PR3)X [where X = Cl (90,188, 191), Br (90, 188), I (179), SCN (104), NCO (231), C2R (92, 97), etc.] has also been observed to occur, yielding clusters in which the transition metal is in a higher oxidation state. This type of reaction was first investigated by Nyholm and coworkers (90, 232), and some examples are given below ... [Pg.331]

The gold(I)-phosphine fragment, nominally substituting the Fe(hjnge)-Fe(hinge) bridging hydride of the tetrairon butterfly, has migrated towards the Boride atom. [Pg.177]

Multidentate phosphine-gold(i) fragments can be used to build up high-nuclearity mixed-metal clusters. The interaction of [(triphos)(AuCl)3] (triphos= l,l,l-tris(diphenylphosphinomethyl)ethane) with the iron anions [Fe2(//-L)(C0)7] (L = PPh2, HC=CHPh, PhC=GHPh, CO) gave the corresponding mixed-metal clusters [ Fe2(jLt-L)(CO)7Au 3(triphos)], as shown in Scheme... [Pg.344]

The number of gold complexes containing tertiary phosphines, arsines, or stibines as ligands is large because of the wide use of the fragment AuL+, mainly with L = PPh3, in the synthesis of... [Pg.1042]

See other pages where Gold-phosphine fragments is mentioned: [Pg.386]    [Pg.1037]    [Pg.26]    [Pg.386]    [Pg.43]    [Pg.107]    [Pg.329]    [Pg.332]    [Pg.353]    [Pg.358]    [Pg.380]    [Pg.284]    [Pg.648]    [Pg.386]    [Pg.1037]    [Pg.26]    [Pg.386]    [Pg.43]    [Pg.107]    [Pg.329]    [Pg.332]    [Pg.353]    [Pg.358]    [Pg.380]    [Pg.284]    [Pg.648]    [Pg.144]    [Pg.999]    [Pg.1073]    [Pg.1081]    [Pg.146]    [Pg.340]    [Pg.351]    [Pg.267]    [Pg.22]    [Pg.176]    [Pg.25]    [Pg.241]    [Pg.110]    [Pg.38]    [Pg.1106]    [Pg.299]    [Pg.123]    [Pg.148]    [Pg.208]    [Pg.215]    [Pg.1006]    [Pg.1029]    [Pg.1074]    [Pg.148]    [Pg.148]   
See also in sourсe #XX -- [ Pg.14 , Pg.23 , Pg.315 , Pg.319 , Pg.344 , Pg.355 , Pg.389 , Pg.407 , Pg.422 , Pg.477 , Pg.486 , Pg.509 , Pg.528 , Pg.535 , Pg.556 , Pg.894 , Pg.977 , Pg.989 , Pg.1057 , Pg.1059 , Pg.1068 , Pg.1182 , Pg.1770 ]



SEARCH



© 2024 chempedia.info