The three-dimensional configuration of the ester heterocycle is basically the same as that of the carbocycle. Compound: Tricyclohexylphosphonium tetrafluoroborate(SMILESS: F[B-](F)(F)F.[PH+](C1CCCCC1)(C2CCCCC2)C3CCCCC3,cas:58656-04-5) is researched.Reference of Pentaerythrityltetrabromide. The article 《Wide range of pKa values of coordinated dihydrogen. Synthesis and properties of some η2-dihydrogen and dihydride complexes of ruthenium》 in relation to this compound, is published in Journal of the American Chemical Society. Let’s take a look at the latest research on this compound (cas:58656-04-5).
The new ruthenium hydride complexes CpRuH(L) [L = PR2CH2CH2PR2, R = p-CF3C6H4 (dtfpe) or R = p-MeOC6H4 (dape)] were prepared by reaction of NaOMe with CpRuCl(L), which were obtained by treating CpRuCl(PPh3)2 with L. Similarly, Cp*RuH(L) [L = dppm, (PMePh2)2] were prepared from the reaction of NaOMe with Cp*RuCl(L) obtained from the reaction of Cp*RuCl2 with L in the presence of Zn. Protonation of CpRuH(L) (L = dtfpe, dape) and Cp*RuH(dppm) with HBF4·Et2O produces mixtures of [CpRu(H)2(L)]+ and [CpRu(η2-H2)(L)]+, and [Cp*Ru(H)2(dppm)]+ and [Cp*Ru(η2-H2)(dppm)]+. The pKa values of the dihydrogen/dihydride complexes [CpRuH2(L)]+ (L = dtfpe, dppm, dppe, (PPh3)2, dppp, dape) and [Cp*RuH2(L)]+ (L = dppm, (PMePh2)2) are determined by studying acid/base equilibrium by 1H and 31P NMR spectroscopy in both CH2Cl2 and THF. The electrochem. properties of the monohydrido complexes CpRuH(L) and Cp*RuH(L) are reported. Peak potentials for oxidation of these monohydrides and pKa values of the cationic complexes are linearly related for all the complexes with a dihydrogen form: pKa(Ru(H2)+) = -10.7Epa (RuH+/RuH) + 13.0. As expected η2-H2 acidity decreases as the parent hydride becomes easier to oxidize. The related complexes with just a dihydride form, [CpRu(H)2(L)]+ [L = (PPh3)2, dppp] and [Cp*Ru(H)2(PMePh2)2]+, give a similar trend. Acidity constants have been determined for both tautomers when they observed; the pKa of the η2-H2 form is ∼0.3 pKa unit less (more acidic) than that of the (H)2 form for the complexes with L = dtfpe, dppe, and dape but is 0.4 unit greater for [Cp*RuH2(dppm)]+. The acidities of the two tautomers are similar because their concentrations are similar and they have the same monohydrido conjugate base. Other trends in pKa, 1J(HD), and δRu(H2) values of dihydrogen complexes and ratio of dihydride to dihydrogen tautomers and the peak potentials for oxidation of the monohydrido complexes are presented. These correlations are shown to be of value in explaining/predicting the propensity of dihydrogen to undergo heterolytic cleavage. Extremes in pKa values of such cyclopentadienylruthenium(II) complexes are expected for [Cp*RuH2(dmpe)]+ (pKa ∼ 12) and [CpRuH2(CO)2]+ (pKa ∼ -6).
In addition to the literature in the link below, there is a lot of literature about this compound(Tricyclohexylphosphonium tetrafluoroborate)Recommanded Product: 58656-04-5, illustrating the importance and wide applicability of this compound(58656-04-5).
Reference:
Imidazole – Wikipedia,
Imidazole | C3H4N2 – PubChem