David Elorriaga, Fernando Carrillo-Hermosilla, A. Antiñolo
Feb 24, 2012
Citations
0
Influential Citations
32
Citations
Journal
Organometallics
Abstract
A series of guanidine proligands, 2-(4-(tert-butyl)phenyl)-1,3-diisopropylguanidine (1), 2-(4-bromophenyl)-1,3-diisopropylguanidine (2), 2-(4-methoxyphenyl)-1,3-diisopropylguanidine (3), and 2,2′-(1,4-phenylene)bis(2′,3-diisopropylguanidine) (4), has been reacted with [NbBz3(NtBu)] (5) through a protonolysis reaction to obtain new monoguanidinate-supported dibenzyl niobium complexes, {NbBz2(NtBu)[(4-tBuC6H4)N═C(NiPr)(NHiPr)]} (6), {NbBz2(NtBu)[(4-BrC6H4)N═C(NiPr)(NHiPr)]} (7), {NbBz2(NtBu)[(4-MeOC6H4)N═C(NiPr)(NHiPr)]} (8), and the dinuclear complex {[NbBz2(NtBu)]2[(C6H4)(N═C(NiPr)(NHiPr))2]} (9). Complexes 6, 8, and 9 were structurally characterized. These neutral complexes contain a η2-benzyl ligand coordinated to the metal center. Insertion migratory reactions with isocyanides resulted in the formation of bis-κ2-iminoacyl species, {Nb(NtBu)(tBuN═CCH2Ph)2[(4-tBuC6H4)N═C(NiPr)(NHiPr)]} (10), {NbBz2(NtBu) (tBuN═CCH2Ph)2[(4-BrC6H4)N═C(NiPr)(NHiPr)]} (11), {Nb(NtBu)(tBuN═CCH2Ph)2[(4-MeOC6H4)N═C(NiPr)(NHiPr)...