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NHC Ligated Group 11 Metal-Arylthiolates Containing an Azide Functionality Amenable to "Click" Reaction Chemistry.
Inorganic Chemistry 2018 September 5
The reaction of N-heterocyclic carbene (NHC) Group 11 metal complexes, [(NHC)M-X] (X = chloride, acetate), with the new azide-modified arylthiol 1-HSCH2 -2,5-Me2 -4-N3 CH2 -C6 H2 , 1 (for M = Au; X = Cl), or 1-Me3 SiSCH2 -2,5-Me2 -4-N3 CH2 -C6 H2 , 2 (for M = Cu, X = Cl; M = Ag, X = OAc), affords the "clickable" NHC-metal thiolates [( i Pr2 -bimy)Au-(1-SCH2 -2,5-Me2 -4-N3 CH2 -C6 H2 )], 5; [(IPr)Au-(1-SCH2 -2,5-Me2 -4-N3 CH2 -C6 H2 )], 6; [(IPr)Ag-(1-SCH2 -2,5-Me2 -4-N3 CH2 -C6 H2 )], 7; and [(IPr)Cu-(1-SCH2 -2,5-Me2 -4-N3 CH2 -C6 H2 )], 8 ( i Pr2 -bimy = 1,3-di-isopropylbenzimidazol-2-ylidene, IPr = 1,3-bis(2,6-di-iso-propylphenyl)imidazol-2-ylidene). Single-crystal X-ray analysis of all metal complexes show that they are two-coordinate, nearly linear, with a terminally bonded thiolate ligand possessing an accessible azide (-N3 ) moiety. The strain-promoted alkyne-azide cycloaddition (SPAAC) reaction of complex 6 with bicyclo[6.1.0]non-4-yn-9-ylmethanol (BCN-OH) and dibenzocyclooctyne-amine (DBCO-NH2 ) illustrated the reactivity of the azide moiety toward strain-promoted cycloaddition. The rate of the SPAAC reaction between complex 6 and BCN-OH was determined via 1 H NMR spectroscopy under second order conditions, and was compared to that of BCN-OH with PhCH2 N3 .
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