Diamido tantalum(V) complexes derived from a diazamacrocycle. (15th July 2018)

• Record Type: Journal Article
• Authors: Porter, Robin M.; Reid, Gillian; Danopoulos, Andreas A.
• Is Part Of: Polyhedron. Volume 149(2018)
• Page Start: 34
• Page End: 38
• Publication Date: 2018-07-15
• Subjects: Azamacrocycle -- Amido -- Bimetallic -- Alkylidene -- Tantalum; Chemistry, Inorganic -- Periodicals; Chimie inorganique -- Périodiques; Organometaalverbindingen; Anorganische chemie; 546.05
• DOI: 10.1016/j.poly.2018.04.019
• Languages: English
• ISSNs: 0277-5387

Abstract

Graphical abstract: Dianionic diazamacrocycles can act as face-capping spectators of Ta organometallics, support Ta/Li heterometallic alkylidenes and promote intramolecular CH activation by σ-bond metathesis. Abstract: The amido complexes [Ta{O(N)2 }(CH2 Ph)3 ], (1 ), [Ta{O(N)2 }(μ-CHBu t ){μ-O(NH)N}Li], (2 ), and [Ta{O(N)2 }Cl3 ], (3 ), all featuring the dianionic diamido macrocycle [O(N)2 ] 2− originating from O(NH)2 by deprotonation, O(NH)2 = 3, 3-dimethyl-1, 5-diaza-8-oxacyclodecane, have been prepared from Ta(CH2 Ph)5, Ta(CH2 t Bu)3 Cl2 and TaCl5 by alkanolysis, salt metathesis with Li2 [O(N)2 ] and Me3 SiCl elimination with O(NSiMe3 )2, respectively. Structural analyses revealed that in (1 ) the macrocycle is facially coordinated, while (2 ) contains one dianionic, facially coordinated macrocycle and one monoanionic macrocycle coordinating one lithium atom and metallated at one of the 3-methyl groups by the Ta.