A NMR, X-ray, and DFT combined study on the regio-chemistry of nucleophilic addition to platinum(II) coordinated terminal olefins
作者:Carmen R. Barone、Renzo Cini、Eric Clot、Odile Eisenstein、Luciana Maresca、Giovanni Natile、Gabriella Tamasi
DOI:10.1016/j.jorganchem.2008.05.040
日期:2008.8
1g; tmeda = N,N,N′,N′-tetramethyl-1,2-ethanediamine) has been considered. In the styrene complex (1b) both solution (NMR) and solid state (X-ray) data indicate a significant difference in the Pt–C bond lengths (the longer bond being that involving the olefin carbon atom carrying the phenyl ring). Such a difference increases when X is an electron donor group (EDG, 1c) and decreases when X is an electron
Vinylic Deprotonation in the Coordination Sphere of Platinum(
<scp>II</scp>
): Regioselective Formation of Alkenyl Complexes
作者:Giuseppe Lorusso、Giovanni Boccaletti、Nicola G. Di Masi、Francesco P. Fanizzi、Luciana Maresca、Giovanni Natile
DOI:10.1002/ejic.200400512
日期:2004.12
C6H5 (1a), 4-CH3OC6H4 (1b), 3-NO2C6H4 (1c); tmeda = N,N,N′,N′-tetramethylethylenediamine) with triethylamine, or even with inorganic carbonate, leads to the abstraction of a vinylic proton and formation of the (alkenyl)platinum species [PtCl(E)-CH=CHAr}(tmeda)] (2) in high yield. The initially formed (E) isomer, in solution of chlorinated solvents, partly isomerizes into the (Z) form [equilibrium ratio
Deprotonation versus Nucleophilic Substitution in Some Platinum(II) Coordinated Olefins Containing an Electron Withdrawing Group
作者:Carmen R. Barone、Sara de Pinto、Giuseppe Lorusso、Nicola G. Di Masi、Luciana Maresca、Giovanni Natile
DOI:10.1021/om1005098
日期:2010.9.27
new cationic olefin complexes of platinum(II) with electron-withdrawing substituents on the allylic carbon, [PtCl(η2-CH2═CHCH2X)(tmeda)]+ (X = −C(O)OCH3 (1a), −OC(O)CH3 (1b)) have been synthesized and their reactivity toward nucleophiles investigated. The reaction of 1a with various nucleophiles, including water, causes allylic deprotonation and formation of the η3-allyl complex [Ptη3-CH2CHCHC(O)OCH3}(tmeda)]+
Coupling of cationic olefin complexes of platinum(II) with potential ambident nucleophiles
作者:Carmen R. Barone、Renzo Cini、Sara de Pinto、Nicola G. Di Masi、Luciana Maresca、Giovanni Natile、Gabriella Tamasi
DOI:10.1016/j.ica.2009.08.035
日期:2010.1
the phenyl ring taking the place of nitrogen, is observed (4a and 5a). Reaction with a tertiary aromatic amine, such as N,N-dimethylaniline, leads exclusively to the C-coupled species. The phenolate anion acts initially as an oxygen donor, however the resulting species (6a), in contact with free phenol, rearranges to C-bonded species (7a). For free phenol/6a ratios ⩾ 5 the rearranged product has an
Aiding Factors in the Formation of Azaplatinacyclobutane Rings – X‐ray and Crystal Structure of [Pt{CH(Ph)CH
<sub>2</sub>
NEt
<sub>2</sub>
‐κC,κN}(
<i>N</i>
,
<i>N</i>
,
<i>N′</i>
,
<i>N′</i>
‐tetramethylethylenediamine)]
<sup>+</sup>
and of Its Open‐Chain Precursor
作者:Giuseppe Lorusso、Carmen R. Barone、Nicola G. Di Masi、Concetta Pacifico、Luciana Maresca、Giovanni Natile
DOI:10.1002/ejic.200601219
日期:2007.5
The addition products 2 of a secondary amine to a coordinated olefin, in the cationic complexes [PtCl(η2-CH2=CHR)(tmeda)]+ (tmeda = N,N,N′,N′-tetramethylethylenediamine; R = Me, 1a; Ph, 1b, H, 1c), undergo in basic medium an intramolecular nucleophilic substitution with elimination of the chlorido ligand and formation of an azaplatinacyclobutanering 3. The ring-closing process occurs notwithstanding