Aluminum Alkyls Containing Guanidinate Ligands

Aeilts, Sarah L, Coles, Martyn P, Swenson, Dale C, Jordan, Richard F and Young, Victor G Jr (1998) Aluminum Alkyls Containing Guanidinate Ligands. Organometallics, 17 (15). 3265 - 3270. ISSN 0276-7333

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The synthesis and structures of new aluminum complexes incorporating guanidinate ligands (R2NC(NR')2-) are described. The reaction of iPrN=C=NiPr with LiNR2 reagents yields Li[R2NC(NiPr)2] guanidinate salts, which are reacted in situ with AlCl3 or AlMe2Cl to afford {R2NC(NiPr)2}AlCl2 (1a, R = Me; 1b, R = Et; 1c, R = iPr; 1d, R = SiMe3) or {R2NC(NiPr)2}AlMe2 (2a, R = Me; 2b, R = Et; 2c, R = iPr), respectively. The reaction of 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) with AlMe3 generates {(-hpp)AlMe2}2 (3). Complexes 1a, 1d, and 3 have been characterized by X-ray crystallography. 1a and 1d adopt monomeric structures with symmetric chelated bidentate guanidinate ligands. Delocalization of the -NR2 lone pair into the chelate ring is important for 1a but not for 1d, due to N-Si -bonding and steric crowding. The bicyclic structure of the hpp- ligand enforces a dimeric -hpp- structure for 3.

Item Type: Article
Additional Information: Post-doctoral work
Schools and Departments: School of Life Sciences > Chemistry
Depositing User: Martyn Coles
Date Deposited: 06 Feb 2012 20:02
Last Modified: 30 Nov 2012 17:05
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