488148-74-9Relevant academic research and scientific papers
New ylide-, alkynyl-, and mixed alkynyl/ylide-gold(I) complexes
Vicente, José,Singhal, Anshu R.,Jones, Peter G.
, p. 5887 - 5900 (2008/10/08)
Reactions of AuCl(tht) (tht = tetrahydrothiophene) with various ylides in equimolar amounts give the complexes [AuCl(ylide)]Xn (n = 0, ylide = C(PPh3)2 (la), 4-MeC6H4SO2CHPPh3 (1b); n = 1, X = TfO, ylide = [HC(PPh3)2]+ (2)) and [(AuCl)2{μ-C(PPh3)2}] (3) when using a 2:1 molar ratio. The complex la reacts (i) with Tl(acac) to give [Au(acac){C(PPh3)2}] (4) and (ii) with terminal alkynes (with or without added Et3N) to give [HC(PPh3)2] [Au(C=CC6H4R-4)Cl] (R = H (5a), CN (5b), OMe (5c), NO2 (5d)) instead of the desired complexes [Au(C=CC6H4R-4){C{PPh3}2}]. These complexes (R = H (6a), CN (6b), OMe (6c), NO2 (6d), C≡CPh (6e)) were prepared by the reaction of [Au(acac){C(PPh3)2}] (4) with a large excess of alkynes (ca. 1:25-30). Complex 1b reacts with terminal alkynes in the presence of Et3N differently from 1a, giving the complexes [Au(C≡CC6H4R-4){CH(PPh3){S(O)2 C6H4Me-4}}](R = H (7a), NC (7b), OMe (7c), NO2 (7d), C≡CPh (7e)). The reaction of PPN[Au(acac)2] with the phosphonium salt [H2C(PPh3)2](TfO)2 or [4-MeC6H4S(O)2CH2PPh3]TfO in 1:2 stoichiometry afforded the cationic complex [Au(ylide)2](TfO)n, where the ylide is [HC(PPh3)2]- (n = 3, 8a) or 4-MeC6H4S(O)2CHPPh3 (n = 1, 8b), respectively. The crystal structures of [4-MeC6H4S(O)2CH2PPh3]TfO , 1b-0.5CH2Cl2, 3.3CH2Cl2, 5a, 5c, 6d·THF, and 8b have been determined.
