The organic oxidant TEMPO (2,2,4,4‐tetramethylpiperdine‐1‐oxyl) was immobilized on iron oxide (Fe3O4) superparamagnetic nanoparticles by employing strong metal‐oxide chelating phosphonates and azide/alkyne “click” chemistry. This simple preparation yields recyclable TEMPO‐coated nanoparticles with good TEMPO loadings. They have excellent magnetic response and efficiently catalyze the oxidation of...
During an attempt to synthesize polyrotaxanes by Wittig step-growth polymerization between a dibenzylic bis(triphenylphosphonium)-stoppered rotaxane, with an NH 2+ recognition site encircled by a DB24C8 ring, and appropriate derivatives of terephthaldehyde carrying bulky groups, large macrocyclic compounds with the topologies of catenanes and molecular-necklaces, are formed.
Computational modeling of a carbene 1,2-H shift in the solid-to-solid reaction of 1-(4-biphenyl)-2-phenyldiazopropane to (Z)-1-(4-biphenyl)-2-phenylpropene predicts that the planar biphenyl substituent of molecules witnessing the reaction will twist to relieve some of the steric strain accumulated in the crystal lattice. Changes in Raman spectra followed as a function of reaction progress confirmed...
The synthesis of epoxy-terminated dialkyl disulfides for incorporation into polymerizable self-assembled monolayers is reported. The epoxide is installed by an indirect method in which the disulfide linkage is used as a built-in protecting group.
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