The series of platinum complexes [ PtCl( g2- CH2@ CH - C6H4 - X)( tmeda)]( ClO4) ( X= H, 1b; 4- OMe, 1c; 3- OMe, 1d; 4- CF3, 1e; 3- CF3, 1f; 3- NO2, 1g; tmeda = N, N, N0, N0- tetramethyl- 1,2- ethanediamine) has been considered. In the styrene complex ( 1b) both solution ( NMR) and solid state ( X- ray) data indicate a signi. cant difference in the Pt - C bond lengths ( the longer bond being that involving the ole. n 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 withdrawing group ( EWG, 1d - g). The attack of a nucleophile ( MeO ) to the substituted carbon ( Markovnikov type, M) is by far the most favoured in the case of unsubstituted ( 1b) or EDG- substituted ( 1c) styrenes. The presence of an EWG ( compounds 1d- g) levels off the probability of M and anti- M type of attack. DFT calculations on 1b, c and 1e were also performed. The NLMO analysis reveals the crucial role of the interaction between the. lled p orbital of the ole. n and the empty d orbital of platinum; the carbon with greater electron density becoming less susceptible of nucleophilic attack

BARONE C., R., Cini, R., Clot, E., Eisenstein, O., Maresca, L., Natile, G., et al. (2008). A NMR, X-Ray, and DFT combined study on the regio-chemistry of nucleophilic addition to platinum(II) coordinated terminal olefins. JOURNAL OF ORGANOMETALLIC CHEMISTRY, 693(17), 2819-2827 [10.1016/j.jorganchem.2008.05.040].

A NMR, X-Ray, and DFT combined study on the regio-chemistry of nucleophilic addition to platinum(II) coordinated terminal olefins

CINI, RENZO;TAMASI, GABRIELLA
2008

Abstract

The series of platinum complexes [ PtCl( g2- CH2@ CH - C6H4 - X)( tmeda)]( ClO4) ( X= H, 1b; 4- OMe, 1c; 3- OMe, 1d; 4- CF3, 1e; 3- CF3, 1f; 3- NO2, 1g; tmeda = N, N, N0, N0- tetramethyl- 1,2- ethanediamine) has been considered. In the styrene complex ( 1b) both solution ( NMR) and solid state ( X- ray) data indicate a signi. cant difference in the Pt - C bond lengths ( the longer bond being that involving the ole. n 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 withdrawing group ( EWG, 1d - g). The attack of a nucleophile ( MeO ) to the substituted carbon ( Markovnikov type, M) is by far the most favoured in the case of unsubstituted ( 1b) or EDG- substituted ( 1c) styrenes. The presence of an EWG ( compounds 1d- g) levels off the probability of M and anti- M type of attack. DFT calculations on 1b, c and 1e were also performed. The NLMO analysis reveals the crucial role of the interaction between the. lled p orbital of the ole. n and the empty d orbital of platinum; the carbon with greater electron density becoming less susceptible of nucleophilic attack
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11365/7001