52653-34-6

Upstream product

• 12120-15-9 ethylenebis(triphenylphosphine)platinum⁽⁰⁾ 
• 78-80-8 2-methylbut-1-en-3-yne 
• 10199-34-5 cis-dichlorobis(triphenylphosphine)platinum(II) 
• 79785-97-0 hydrazine hydrate 

Downstream Products

• 198888-05-0 trans-(Ph3P)2Pt(CF3CO2)[η(1)-H2C=CC(CH3)=CH2] 
• 198888-05-0 (Ph3P)2Pt[η(3)-H2C=CC(CH3)=CH2](+)CF3CO2(-) 

Relevant academic research and scientific papers

Platinum(0)-enyne complexes: the platinum analogue of an intermediate in the palladium(0)-catalyzed benzannulation of conjugated enynes

Pt(0)-enyne π complexes, which could be the platinum analogues of an intermediate in the palladium(0)-catalyzed benzannulation of conjugated enynes, were synthesized, and the structure and reactivity of the complexes were investigated.

Formation of platinum allyl and propargyl complexes from protonation of platinum enyne and diyne complexes

Protonation of (Ph3P)2Pt[η2-HC=CC(CH3) =CH2] (2a) with excess HBF4·Et2O produced the π-allyl complex (Ph3P)2Pt[η3-H2C=CC(CH 3)=CH2] +BF4- (3a-BF4) instead of a π-propargyl complex. Reaction of excess CF3CO2H with 2a initially produced the analogous π-allyl complex 3a-CF3CO2 which then added CF3CO2H across the vinylidene unit of 3a-CF3CO2 to give the π-allyl complex (Ph3P)2Pt[η3-CH3C(CF 3CO2)C(CH3)CH2]+CF 3CO2- (5a). Protonation of the platinum diyne complex [(p-CH3-C6H4)3P] 2Pt(η2-CH3C≡CC≡CCH3) (7b) with HBF4·Et2O at -73°C initially produced the platinum hydride complex trans-[(p-CH3-C6H4)3P] 2-PtH(η2-CH3C ≡ CC ≡ CCH3) +BF4- (9), which rearranged to the platinum π-propargyl complex [(p-CH3-C6H4)3P] 2Pt[η3-(CH3CH=)-CC ≡ CCH3]+BF4- (11) at -28°C.

SYNTHESIS OF CIS-CR)2(PPh3)2> AND TRANS-CR)(PPh3)2> COMPLEXES. CRYSTAL AND MOLECULAR STRUCTURES OF CIS-CC(OH)Me2>2(PPh3)2>*H2O, TRANS-CC(OH)Me2>(PPh3)2>*0.5PhMe, AND TRANS-CC(OH)MeEt>(PPh3)2>*Me2CO. INFLUENCE OF BASES AND THEIR CONCENTRATI...

Complexes cis-CR)2(PPh3)2> can be obtained from cis- and HCCR in 30 percent aqueous ammonia as solvent.Complexes trans-CR)(PPh3)2> are obtained by using chloroform (or dichloromethane)-diethylamine as solvent.No dehydration reactions of the acetylenic alcohols are observed.X-ray analyses on cis-CC(OH)Me2>2(PPh3)2>*H2O, trans-CC(OH)Me2>(PPh3)2>*0.5PhMe, and trans-CC(OH)MeEt>(PPh3)2>*Me2CO revealed in the cis complex the presence of a water molecule forming two strong hydrogen bond with the two cis-oriented hydroxy-groups of the acetylide ligands.In all the complexes the co-ordination around platinum is distorted square planar with the acetylide ligands ?-bonded to platinum.Crystallographic details: cis-CC(OH)Me2>2(PPh3)2>*H2O, monoclinic, space group P21/c, with a = 15.473(5), b = 21.725(6), c = 13.439(4) Angstroem, β = 113.95(3)deg, and Z = 4; R 0.052 for 3 110 observed reflections; trans-CC(OH)Me2>(PPh3)2>*0.5PhMe, triclinic, space group P, with a = 11.695(3), b = 19.690(6), c = 9.214(2) Angstroem, α = 101.88(3), β = 104.26(3), γ = 85.55(3)deg, and Z = 2; R = 0.053 for 3 961 observed reflections; CC(OH)MeEt>(PPh3)2>*Me2CO, triclinic, space group P, with a = 15.544(6), b = 12.567(4), c = 11.719(3) Angstroem, α = 91.12(3), β = 105.36(3), γ = 111.39(3)deg, and Z = 2; R = 0.046 for 4 704 observed reflections.The influence of NH3, NHEt2, and H2NNH2 on the reactivity of cis- with monosubstituted acetylenes is discussed.