X-type silyl ligands for transition-metal catalysis

Given the critical importance of novel ligand development for transition-metal (TM) catalysis, as well as the resurgence of the field of organosilicon chemistry and silyl ligands, to summarize the topic of X-type silyl ligands for TM catalysis is highly attractive and timely. This review particularly emphasizes the unique σ-donating characteristics and trans-effects of silyl ligands, highlighting their crucial roles in enhancing the reactivity and selectivity of various catalytic reactions, including small molecule activation, Kumada cross-coupling, hydrofunctionalization, C-H functionalization, and dehydrogenative Si-O coupling reactions. Additionally, future developments in this field are also provided, which would inspire new insights and applications in catalytic synthetic chemistry.

Protocol for (E)-selective semihydrogenation of alkynes using iridium-based catalyst

In this protocol, we describe highly (E)-selective alkyne semihydrogenation employing commercially available iridium complex and a bidentate phosphine ligand. We provide steps for (E)-stilbene synthesis, remaining formic acid neutralization, and determination of the (Z)/(E) ratio using gas chromatography analysis. We then detail (E)-stilbene purification using a short pad of silica and NMR analysis. The protocol is compatible with a wide range of functionalities and different types of alkynes. For complete details on the use and execution of this protocol, please refer to Kusy et al. (2022).1.