Application In Synthesis of Cuprous thiocyanate, If you are hungry for even more, make sure to check my other article about Application In Synthesis of Cuprous thiocyanate
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The reaction of Me3SiC<*>CSiMe3 (1), LnMC<*>CSiMe3 (4a, LnM = Cp(CO)2Fe; 4b, LnM = Cp(CO)3Mo> and E(C<*>CR)2 (6, E = Me2Si; 8, E = (eta5-C5H4SiMe3)2Ti; R is a singly bonded organic ligand) with CuX (2) (X is a halide or pseudohalide) is described. 1 and 4 react with CuX (2a, X = Cl; 2b X = Br; 2c, X = I; 2d, X = OSO2CF3) to yield the dimeric compounds <(eta2-Me3SiC<*>CSiMe3)CuX>2 (3a, X = Cl; 3b, X = Br; 3c, X = I; 3d, X = OSO2CF3) or <(eta2-LnMC<*>CSiMe3)CuX>2 (5a, LnM = Cp(CO)2Fe, X = Cl; 5b, LnM = Cp(CO)3Mo, X = Cl) respectively.In these compounds the C2 building block is eta2-coordinated to a CuX moiety and by the formation of copper-X-bridges (Cu2X2) a dimer is formed.However, the reaction of Me2Si(C<*>CSiMe3)(C<*>CR) (6a, R = SiMe3; 6b, R = H) with CuX (2) (X = Cl, Br, OSO2CF3, O2CMe) affords polymeric CSiMe3)(eta2-C<*>CR)Cu2X2>>n (7a, R = SiMe3, X = Cl; 7b, R = SiMe3, X = Br; 7c, R = H, X = Cl; 7d, R = H, X = Br; 7e, R = SiMe3, X = OSO2CF3; 7f, R = SiMe3, X = O2CMe) in high yields.In 7a-7f each alkynyl fragment is eta2-coordinated to a CuX unit.While the reaction of 6a or 6b with CuX yields polymeric 7a-7f, the organometallic, 1,4-diyne RC<*>C--C<*>CR ( = (eta5-C5H4SiMe3)2Ti; 8a, R = Ph; 8b, R = SiMe3) affords with CuX (2a, X = Cl; 2b, X = Br; 2c, X = I; 2e, X = CN; 2f, X = SCN) the dinuclear compounds <(eta5-C5H4SiMe3)2Ti(C<*>CR)2>CuX (9a, R = Ph, X = Cl; 9b, R = SiMe3, X = Cl; 9c, R = SiMe3, X = Br; 9d, R = SiMe3, X = I; 9e, R = SiMe3, X = CN; 9f, R = SiMe3, X = SCN).Compounds 9a-9f feature a monomeric copper(I) halide or copper(I) pseudohalidemoiety, which is stabilized by the chelating effect of the alkynyl ligands on (C<*>CR)2. <(eta5-C5H4SiMe3)2Ti(C<*>CSiMe3)2>CuCl (9b) reacts with AgX (X = CN, SCN, O2CMe, O2CPh) to yield <(eta5-C5H4SiMe3)2Ti(C<*>CSiMe3)2>CuX (9e, X = CN; 9f, X = SCN; 9g, X = OC(O)Me; 9h, X = OC(O)Ph) by precipitation of AgCl.In addition, the bis(alkynyl)-ansa-titanocene <(eta5-C5H4)Me2Si(eta5-C5H3SiMe3)>Ti(C<*>CSiMe3)2 (10) yields with CuCl (2a) the dinuclear species <Ti(C<*>CSiMe3)2>CuCl (11).The identity of compounds 3, 5, 7, 9 and 11 is confirmed by analytical and spectroscopic (IR, MS, 1H, 13C NMR) data, and that of <(eta5-C5H4SiMe3)2Ti(C<*>CPh)2>CuCl (9a) is confirmed by X-ray analysis.Crystals of 9a are monoclinic, space group Pc with cell constant a = 992.6(7), b = 1210(1), c = 1335.5(7) pm, beta = 105.75(5) deg, V = 1543(2)x106 pm3 and Z = 2.Keywords: Alkynes, 1,4-Diynes; Copper(I) halides; Copper(I) pseudohalides
Application In Synthesis of Cuprous thiocyanate, If you are hungry for even more, make sure to check my other article about Application In Synthesis of Cuprous thiocyanate
Reference:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”