So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic.Alcock, Nathaniel W.; Hill, Anthony F.; Melling, Richard P. researched the compound: Potassiumtris(1-pyrazolyl)borohydride( cas:18583-60-3 ).Electric Literature of C9H10BKN6.They published the article 《Polyazolyl chelate chemistry. 3. (σ-Organyl)[tris(pyrazol-1-yl)borato]ruthenium complexes》 about this compound( cas:18583-60-3 ) in Organometallics. Keywords: crystal structure pyrazolylborate ruthenium phenylethynylstyryl; mol structure pyrazolylborato ruthenium phenylethynylstyryl; vinylruthenium chloride complex substitution pyrazolylborate. We’ll tell you more about this compound (cas:18583-60-3).
The reactions of K[HB(pz)3] (pz = pyrazol-1-yl) with the coordinatively unsaturated σ-vinyl complexes [Ru(CR:CHR)Cl(CO)(PPh3)2] (R = H, Me, Ph) proceed with loss of a chloride and a phosphine ligand to provide the compounds [Ru(CR:CHR)(CO)(PPh3){HB(pz)3}] in high yield. Similar treatment of the complex [Ru(C6H4Me-4)Cl(CO)(PPh2)2] leads to the related σ-aryl derivatives [Ru(C6H4Me-4)(CO)(PPh3){HB(pz)3}]. The α-(phenylethynyl)-trans-β-styryl complex [Ru{C(CCPh):CHPh}(CO)(PPh3){HB(pz)3}] is obtained in high yield via the successive treatment of [RuClH(CO)(PPh3)3] with 1,4-diphenyl-1,3-butadiyne and K[HB(pz)3]. The mol. structure of [Ru{C(CCPh):CHPh](CO)(PPh3){HB(pz)3}], determined by x-ray diffraction, can be described as pseudooctahedral with 2 enantiomeric forms in the same asym. unit. The vinyl ligand is almost coplanar with the carbonyl ligand aligned in such a way as to maximize π-retrodative interactions.
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Reference:
Piperazine – Wikipedia,
Piperazines – an overview | ScienceDirect Topics