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Abstract
The reaction of phenyl-2-pyridinyl acetylene (1) with [MCl2(SEt2)] (M=Pd, Pt) affords {M[(o-NC5H4)C=C(Ph)](SEt2)Cl2} (M=Pd, Pt)(2a-b) in almost quantitative yield. The reaction of 2b with nucleophiles such as water and diethylamine lead to nucleophilic addition of these molecules to the activated C=C bond to produce {Pt(cis-(o-NC5H4)CH2C(O)(Ph)]Cl2(SEt2)} (3) and {Pt[cis-(o-NC5H4)CH=C(Ph)(NEt2)]Cl2(HNEt2)} (4), respectively. The reaction of 1 with equimolar amounts of Na2PdCl4 yields the cyclopalladated complex {Pd[(o-NC5H4)(Cl)C=C(Ph)](μ-Cl)}2 (5). On the other hand, only products resulting from the hydrolysis of the C=C bond are found in the reaction of 1 with K2PtCl4. The X-ray structure determination of 2b shows a monoclinic system, space group P21/n, with a = 9.083 (2), b = 11.238 (2), c = 17.913 (3) Å, b = 93.00 (2)°, V = 1826 Å3, Z = 4, Dx = 1.947 g.cm3, R = 0.062 and Rw = 0.075 for the unique reflections and parameters.