We report meta- and para-selective linear alkylation reactions of anilides with alkenes by nickel/N-heterocyclic carbene (NHC) and aluminum catalysis. With a less bulky NHC, the alkylation reaction of N-methyl-N-phenylcyclohexanecarboxamides proceeded mainly at the meta position. In contrast, a bulky NHC ligand led to the para-selective alkylation of N-sec-alkyl anilides.
We report a simple method of fabricating graphite nanoribbons by utilizing a self-collapsing mechanism of multi-walled carbon nanotubes during their growth. In the growth process, a nanotube is expelled from a γ-Fe seed nanoparticle, and then collapses spontaneously forming a nanoribbon. Our microscopic analysis of the structures and crystal orientations of γ-Fe nanoparticles and graphite nanoribbons suggests a possible mechanism of the collapse of nanotubes into nanoribbons, an origami mechanism. Our approach can be developed toward the fabrication of bi-layered graphene nanoribbons. Furthermore, the origami mechanism also yields graphitic nano-tetrahedrons.
We report meta-and para-selective linear alkylation reactions of anilides with alkenes by nickel/N-heterocyclic carbene (NHC) and aluminum catalysis.W ith al ess bulky NHC,t he alkylation reaction of N-methyl-N-phenylcyclohexanecarboxamides proceeded mainly at the meta position. In contrast, ab ulky NHC ligand led to the para-selective alkylation of N-sec-alkylanilides.
Recently semiconductor packages with redistribution layers are gathering attention because of its electrical performance and low energy consumption. Dielectric materials for these packages require low-temperature curability to avoid thermal damage of devices and thermally unstable materials in the packages. Low-temperature curable positive-tone photodefinable material AH-3000 was developed and its reliabilities were evaluated. AH-3000 kept good mechanical properties after reliability test. AH-3000 is also applicable to slit coating, which is required for next-generation panel level package.
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