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000026930 084__ $$2WoS$$aChemistry, Multidisciplinary
000026930 1001_ $$0P:(DE-HGF)0$$aKleij, A. W.$$b0
000026930 245__ $$aA 'dendritic effect' in homogeneous catalysis with carbosilane-supported arylnickel(II) catalysts : observation of active-site proximity effects in atom-transfer radical addition
000026930 260__ $$aWashington, DC$$bAmerican Chemical Society$$c2000
000026930 300__ $$a12112 - 12124
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000026930 440_0 $$08502$$aJournal of the American Chemical Society$$v122$$x0002-7863
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000026930 520__ $$aTransmetalation of polylithiated, carbosilane (CS) dendrimers functionalized with the potentially terdentate ligand [C6H2(CH2NMe2)(2)-2,6-R-4](-) ( NCN) with NiCl2(PEt3)(2) produced a series of nickel-containing dendrimers [GO]-N-4 (4), [G1]-Ni-12 (5), and [G2]-Ni-36 (7) in moderate to good yields. The metallodendrimers 4, 5, and 7 are catalytically active in the atom-transfer radical addition (ATRA) reaction (Kharasch addition reaction), viz. the 1:1 addition of CCl4 to methyl methacrylate (MMA). The catalytic data were compared to those obtained for the respective mononuclear compound [NiCl(C6H2{CH2NMe2}(2)-2,6-SiMe3-4)] (2). This comparison indicates a fast deactivation for the dendrimer catalysts beyond generation [GO]. The deactivation of [G1]-Ni-12 (5) and [G2]-Ni-36 (7) is caused by irreversible formation of catalytically inactive Ni(III) sites on the periphery of these dendrimers. This hypothesis is supported by results of model studies as well as ESR spectroscopic investigations. Interestingly, the use of two alternative nickelated [G1] dendrimers [G1]*-Ni-12 (11) and [G1]-Ni-8 (15), respectively, in which the distance between the Ni sites is increased, leads to significantly improved catalytic efficiencies which approximate those of the parent derivative 2 and [GO]-Ni-4 (4). Preliminary membrane catalysis experiments with [GO]-Ni-4 (4) and [G1]-Ni-12 (5) show that 5 can be efficiently retained in a membrane reactor system. The X-ray crystal structure of the Ni(III) complex [NiCl2(C6H2{CH2NMe2}(2)-2,6-SiMe3-4)] (16), obtained from the reaction of 2 with CCl4, is also reported.
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000026930 7001_ $$0P:(DE-HGF)0$$aGossage, R. A.$$b1
000026930 7001_ $$0P:(DE-HGF)0$$aKlein Gebbink, R. J. M.$$b2
000026930 7001_ $$0P:(DE-HGF)0$$aBrinkmann, N.$$b3
000026930 7001_ $$0P:(DE-HGF)0$$aReijerse, E. J.$$b4
000026930 7001_ $$0P:(DE-Juel1)VDB826$$aKragl, U.$$b5$$uFZJ
000026930 7001_ $$0P:(DE-HGF)0$$aLutz, M.$$b6
000026930 7001_ $$0P:(DE-HGF)0$$aSpek, A. L.$$b7
000026930 7001_ $$0P:(DE-HGF)0$$avan Koten, G.$$b8
000026930 773__ $$0PERI:(DE-600)1472210-0$$a10.1021/ja0026612$$gVol. 122, p. 12112 - 12124$$p12112 - 12124$$q122<12112 - 12124$$tJournal of the American Chemical Society$$v122$$x0002-7863$$y2000
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