Stepwise synthesis of a Zr–C–Si main chain polymer precursor for ZrC/SiC/C composite ceramics

Low valence state Cp2Zr(ii) was firstly obtained by a redox reaction of Cp2ZrCl2 with reductive Mg, which subsequently copolymerized with (CH3)2Si(CH2Cl)2 to form a Zr–C–Si main chain polymeric precursor of polyzirconosilane (PZCS).

Stepwise PEG synthesis featuring deprotection and coupling in one pot

The stepwise synthesis of monodisperse polyethylene glycols (PEGs) and their derivatives usually involves using an acid-labile protecting group such as DMTr and coupling the two PEG moieties together under basic Williamson ether formation conditions. Using this approach, each elongation of PEG is achieved in three steps – deprotection, deprotonation and coupling – in two pots. Here, we report a more convenient approach for PEG synthesis featuring the use of a base-labile protecting group such as the phenethyl group. Using this approach, each elongation of PEG can be achieved in two steps – deprotection and coupling – in only one pot. The deprotonation step, and the isolation and purification of the intermediate product after deprotection using existing approaches are no longer needed when the one-pot approach is used. Because the stepwise PEG synthesis usually requires multiple PEG elongation cycles, the new PEG synthesis method is expected to significantly lower PEG synthesis cost.

Stepwise synthesis of Zr-based metal-organic frameworks: Incorporating trinuclear zirconocene-based metallo-pyridine ligand

Two isostructural heterometallic ZrMOFs (denoted as ZrMOF-Co/Ni) were obtained by stepwise sysnthesis approach. Single-crystal X-ray structural analyses indicate that two ZrMOFs are both built from trinuclear zirconocene-based metallo-pyridine buliding blocks,...

Palladium Oxide-Decorated Mesoporous Silica on Graphene Oxide Nanosheets as Heterogeneous Catalyst for Synthesis of ꞵ-Substituted Indole Derivatives

In this work, an efficient and facile strategy is adopted for the stepwise synthesis of RGO-MSiO2/PdO hybrid nanomaterial (HY-NM). Herein, a hybrid nanostructure of mesoporous silica over graphene oxide (GO)...