Synthesis, stability, and (de)hydrogenation catalysis by normal and abnormal alkene- and picolyl-tethered NHC ruthenium complexes

TLDR: A series of p-cymene and cyclopentadienyl Ru(II)-aNHC complexes were synthesized from 2-methylimidazolium salts with either an N-bound alkenyl (1, 3) or picolyl tether (6, 7) as mentioned in this paper.

About: This article is published in Organometallics.The article was published on 2019-06-21 and is currently open access. It has received 20 citations till now. The article focuses on the topics: Cyclopentadienyl complex & Ruthenium.

Figures

Figure 1: Order of donor strength of imidazolylidene and pyrazolylidene-based NHCs.

Figure 4: ORTEP plot of compound 10. Thermal ellipsoids are drawn at 50% level. For clarity, the phenyl moieties of PPh3 are shown as wireframe presentations, and non-coordinating anions and hydrogens are omitted.

Table 2: Transfer hydrogenation of benzophenone using complexes 1–10 a

Figure 5: 1H-NMR spectra of complex 1 upon titration with DCl showing resonances of complex 1 (a–d), free p-cymene (▲) and an aNHC Ru complex with non-coordinating N-alkenyl tether (●).

Figure 3: ORTEP plots of complexes 5–8. Thermal ellipsoids are drawn at 50% level. For clarity, the phenyl moieties of PPh3 are shown as wireframe presentations, and non-coordinating anions and hydrogens are omitted (structures of 7 and 8 have been obtained from a co-crystal).

Figure 2: ORTEP plots of compounds 1 and 3. Thermal ellipsoids are drawn at 50% level. For clarity, the phenyl moieties of PPh3 are shown as wireframe presentations, and non-coordinating anions and hydrogens are omitted.

Frequently asked questions

Q1. What contributions have the authors mentioned in the paper "Synthesis, stability, and (de)hydrogenation catalysis by normal and abnormal alkene- and picolyl-tethered nhc ruthenium complexes" ?

In this paper, a series of p-cymene and cyclopentadienyl Ru ( II ) -aNHC derivatives have been synthesized from 2methylimidazolium salts with either an N-bound alkenyl ( 1, 3 ) or picolyl tether ( 6, 7 ).