Metal-catalyzed transformations have emerged as indispensable tools for carbon-carbon bond formation in contemporary synthetic chemistry. Metal-promoted cross-couplings and metal-catalyzed allylations represent two of the most widely used reaction types. However, cross-coupling reactions involving allylic electrophiles have not been extensively explored. This review presents an overview of efforts aimed at developing metal-catalyzed allylation reactions between allylic alcohol derivatives and alkenyl or aryl organoboron compounds, leading to 1,4-dienes and allylic arenes, respectively. Particular emphasis is given to regio- and stereoselective allylation procedures. 1 Introduction 2 Allylations Proceeding through π-Allyl Intermediates 2.1 Palladium Catalyzed 2.2 Nickel Catalyzed 2.3 Rhodium Catalyzed 3 Formal S_N2′-Type Allylations 3.1 Palladium Catalyzed 3.2 Rhodium Catalyzed 4 Conclusions and Future Directions

The structures of 4-chloro- and 4-bromotribenzoylbenzene, as well as a solid solution prepared from these two components, are isomorphous and dominated by C–X⋯OC interactions, whereas type-II I⋯I interactions are important in the 4-iodo derivative.

Despite their established hydrogen bonding capability, oxime functional groups (–C(R′)NOH) have received far less attention in supramolecular chemistry than their carboxyl and amide counterparts. Here we report a series of dioximes (R′H, CH₃, NH₂) for which hydrogen bonding patterns have been examined in the solid state to establish the reliability of hydrogen-bonded synthons available for use in supramolecular syntheses using oximes. In all cases, network structures were formed, most frequently propagated through oxime–oxime O–H⋯N hydrogen-bonded dimer formation [R² ₂(6) graph set] and less often using C(3) chain or R⁴ ₄(12) ring arrangements. Even in the systems where R′ = NH₂, robust and dominant oxime–oxime hydrogen bonding prevails, with amino groups playing a supporting role in network construction primarily via weaker N–H⋯O hydrogen bonds. The compounds studied are aromatic dioximes 1,3-C₆H₄(C(R′)NOH)₂1–3 and 1,4-C₆H₄(C(R′)NOH)₂4–6 (R′ = H, CH₃, NH₂), and aliphatic dioximes fumaramide dioxime 7 (R′ = NH₂) and succinamide dioxime 8 (R′ = NH₂).