Regioselective Hydrogenation of Polycyclic Aromatic Hydrocarbons and Olefins Catalyzed by Magnesium‐Activated Chromium Complexes

Abstract

Replacing precious metals with the first-row transition metals having abundant earth reserves in organic synthesis is in line with the sustainable development of chemistry. In this study, the regioselective hydrogenation of polycyclic aromatic hydrocarbons (PAHs) and olefins had been simply realized with a low-valent Cr-catalyst from CrCl 2 and diketimine, which was in situ reduced by magnesium. Results showed that unilateral cyclic hydrogenation of many PAHs could be achieved with this catalyst under mild conditions, which was a convenient and efficient method for the synthesis of partially saturated polycyclic aromatic hydrocarbons.

Novel Red‐Emitting Gd3BW1‐xMoxO9 : Eu3+ Phosphor with High Thermal Stability for Application in UV‐Excited WLEDs and Rapid Visualization of Latent Fingerprints

“…Three other weak peaks at 580, 585‐602 and 649 nm are attributed to the 5 D 0 → 7 F 0 , 5 D 0 → 7 F 1 and 5 D 0 → 7 F 3 transitions of Eu 3+ , respectively [49] . It is well‐known that Eu 3+ is sensitive to the local chemical environment according to the Judd‐Ofelt theory [50–52] . When Eu 3+ ion is located at an inversion symmetry site, the 5 D 0 → 7 F 1 magnetic dipole transition is dominant, while in a site without an inversion center, the 5 D 0 → 7 F 2 electric‐dipole transition is prominent.…”