Thermally Stable Gold(I) Ethylene Adducts: [(HB{3,5‐(CF₃)₂Pz}₃)Au(CH₂CH₂)] and [(HB{3‐(CF₃),5‐(Ph)Pz}₃)Au(CH₂CH₂)]

Gold‐Catalyzed Allyl–Allyl Coupling

“…We also considered the possible formation of an allylgold(I) species by a transmetalation-type process. [13,14] 1 H and 31 P NMR spectroscopic monitoring of the reaction between complex 3 and allyltriphenylstannane or allyltributylstannane in CD 2 Cl 2 shows that complexation of Au I to the alkene occurs at low temperature (À78 to À20 8C) [15] and that propene is formed at about 0 8C. Similar results were obtained with crotyl-and cinnamyltributylstannane, which gave 1butene and allylbenzene, respectively.…”

“…[13,14] 1 H and 31 P NMR spectroscopic monitoring of the reaction between complex 3 and allyltriphenylstannane or allyltributylstannane in CD 2 Cl 2 shows that complexation of Au I to the alkene occurs at low temperature (À78 to À20 8C) [15] and that propene is formed at about 0 8C. [13,14] 1 H and 31 P NMR spectroscopic monitoring of the reaction between complex 3 and allyltriphenylstannane or allyltributylstannane in CD 2 Cl 2 shows that complexation of Au I to the alkene occurs at low temperature (À78 to À20 8C) [15] and that propene is formed at about 0 8C.…”

Generation and Structural Characterization of a Gold(III) Alkene Complex

“…The 1 H NMR spectrum of 3 ‐OTf at 0 °C consists of a single AuMe resonance at δ =1.71, a pair of multiplets for the CH 2 groups in the backbone of the bound cod at δ =2.75 and 2.99, and a broad singlet for the vinylic protons of the bound cod at δ =6.39, which is 0.8 ppm higher than the signal of free cod in CD 2 Cl 2 at δ =5.56. Although vinylic protons typically shift to lower δ values on binding to a metal center,41 as seen in the Au I complex [(HB{3,5‐(CF 3 ) 2 pz} 3 )Au(C 2 H 4 )],31 there are also examples of shifts to higher δ values with especially electron‐deficient metals, such as Ag I in [(HB{3,5‐(CF 3 ) 2 tz} 3 )Ag(C 2 H 4 )] (pz=pyrazolyl, tz=triazolyl) 42. The signal of the ethylene protons of this Ag complex appears 0.3 ppm higher than that of free ethylene.…”

Generation and Structural Characterization of a Gold(III) Alkene Complex

“…Although vinylic protons typically shift to lower d values on binding to a metal center, [41] as seen in the Au I complex [(HB{3,5-(CF 3 ) 2 pz} 3 )Au(C 2 H 4 )], [31] there are also examples of shifts to higher d values with especially electrondeficient metals, such as Ag I in [(HB{3,5-(CF 3 ) 2 tz} 3 )Ag-(C 2 H 4 )] (pz = pyrazolyl, tz = triazolyl). Although vinylic protons typically shift to lower d values on binding to a metal center, [41] as seen in the Au I complex [(HB{3,5-(CF 3 ) 2 pz} 3 )Au(C 2 H 4 )], [31] there are also examples of shifts to higher d values with especially electrondeficient metals, such as Ag I in [(HB{3,5-(CF 3 ) 2 tz} 3 )Ag-(C 2 H 4 )] (pz = pyrazolyl, tz = triazolyl).…”

“…The 1 H NMR spectrum of 3-OTf at 0 8C consists of a single AuMe resonance at d = 1.71, a pair of multiplets for the CH 2 groups in the backbone of the bound cod at d = 2.75 and 2.99, and a broad singlet for the vinylic protons of the bound cod at d = 6.39, which is 0.8 ppm higher than the signal of free cod in CD 2 Cl 2 at d = 5.56. Although vinylic protons typically shift to lower d values on binding to a metal center, [41] as seen in the Au I complex [(HB{3,5-(CF 3 ) 2 pz} 3 )Au(C 2 H 4 )], [31] there are also examples of shifts to higher d values with especially electrondeficient metals, such as Ag I in [(HB{3,5-(CF 3 ) 2 tz} 3 )Ag-(C 2 H 4 )] (pz = pyrazolyl, tz = triazolyl). [42] The signal of the ethylene protons of this Ag complex appears 0.3 ppm higher than that of free ethylene.…”