In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Reactions of potassium tetrachloroplatinate(II) with pyridine derivatives in dimethylformamide and synthesis of potassium trichloro(pyridine)platinum(II), published in 1978-02-15, which mentions a compound: 15227-42-6, Name is cis-Dichlorobis(pyridine)platinum(II), Molecular C10H10Cl2N2Pt, Application of 15227-42-6.
The reactions of K2PtCl4 with pyridine derivatives L (L = py = pyridine, pic = picoline, and lut = lutidine) were studied in DMF. K[PtLCl3] (I) were isolated and the yield decreased with the order, 2,4-lut = 2-pic > 2,6-lut > 4-pic = py, which can be correlated to the steric hindrance of the ortho Me groups. Cis-[PtL2Cl2] (II) is the final product of the reactions. Trans-[PtL2Cl2] (III) can also be obtained from a DMF solution of [Pt(L)4]Cl2 (L = py) at room temperature A comparison of the above reactions in H2O and in DMF was also made.
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Reference:
Tetrahydroisoquinoline – Wikipedia,
1,2,3,4-Tetrahydroisoquinoline | C9H11N – PubChem