@article {4807,
	title = {Synthesis, characterization, and reactivity of scandium chloro, alkyl, aryl, and borohydride complexes, Sc(eta(5)-C5H5)R[N(SiMe2CH2P(i)Pr-2)(2)] (R = Cl, Me, Ph, and BH4)},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {78},
	number = {7},
	year = {2000},
	note = {ISI Document Delivery No.: 343HDTimes Cited: 16Cited Reference Count: 44},
	month = {Jul},
	pages = {1003-1012},
	type = {Article},
	abstract = {{Reaction of ScCl2(THF)[N((SiMe2CH2PPr2)-Pr-i)(2)] with NaCp(DME) leads to Sc(eta(5)-C5H5)Cl[N((SiMe2CH2PPr2)-Pr-i)(2)] (1). The X-ray crystal structure shows the scandium centre to reside in a square pyramidal environment with the [N((SiMe2CH2PPr2)-Pr-i)(2)] - ligand bound in a pseudo-meridional fashion. The H-1 NMR spectrum is consistent with a C-s symmetric structure in solution. Metathesis of the chloride ligand with RLi (R = Me, Ph, BH4) yields the five-coordinate species Sc(eta(5)-C5H5)R[N((SiMe2CH2PPr2)-Pr-i)(2)]. Phenyl 3 and borohydride 4 are isolated as crystalline solids, while methyl 2 resisted crystallization. 2-4 exhibit H-1 NMR spectra consistent with C-s symmetric solution structures. Sc(eta(5)-C5H5)Ph[N((SiMe2CH2PPr2)-Pr-i)(2)] (3) was characterized in the solid state and found to have a similar geometry to that of the parent chloride. Reaction of Sc(eta(5)-C5H5)Me[N((SiMe2CH2PPr2)-Pr-i)(2)] (2) with NH2R (R = Ph, Bu-t) yields the amides Sc(eta(5)-C5H5)NHPh[N((SiMe2CH2PPr2)-Pr-i)(2)] (5) and Sc(eta(5)-C5H5)(NHBu)-Bu-t- [N((SiMe2CH2PPr2)-Pr-i)(2)] (6) via sigma-bond metathesis routes; these reactions are accompanied by a competing reaction at the scandium-amide bond to produce the protonated ligand, HN((SiMe2CH2PPr2)-Pr-i)(2) 5 and 6 are also produced by salt-elimination from the chloride 1 and LiNHR (R = Ph, Bu-t). Sc(eta(5)-C5H5)(BH4)[N((SiMe2CH2PPr2)-Pr-i)(2)] (4) reacts with PMe3 to produce the putative hydride, Sc(eta(5)-C5H5)H[N((SiMe2CH2PPr2)-Pr-i)(2)] (7); this species was identified in solution. An equilibrium between 4, PMe3, 7, and PMe3,BH3 exists which greatly favors the starting scandium-borohydride. Crystals of Sc(eta(5)-C5H5)Cl[N((SiMe2CH2PPr2)-Pr-i)(2)] (1) are monoclinic},
	keywords = {ALKANE ELIMINATION, BETA-HYDROGEN, borohydride, CHAIN, CHEMISTRY, DERIVATIVES, hydride, LANTHANIDE, PERMETHYLSCANDOCENE, PROPAGATION, RAY CRYSTAL-STRUCTURE, SCANDIUM, sigma-bond metathesis, TETRAHYDROBORATE COMPLEXES, ZIEGLER-NATTA POLYMERIZATION},
	isbn = {0008-4042},
	url = {<Go to ISI>://000088695300009},
	author = {Fryzuk,Michael D. and Giesbrecht, G. R. and Rettig, S. J.}
}
