7 research outputs found

    Recess MOSFET Structure Schematic

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    A schematic of the transistor structure.Device structure of (a) gate-recessed SSO MESFET on a bi-layer epitaxial film, and (b) a non-recessed control device on a single-layer film. A heavily doped n+-SSO cap layer on top of a n:SSO channel is used in order to lower the contact resistance as well as the access resistance.Materials Research Science and Engineering Cente

    Synthesis of Ethers via Reaction of Carbanions and Monoperoxyacetals

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    Although transfer of electrophilic alkoxyl (“RO+”) from organic peroxides to organometallics offers a complement to traditional methods for etherification, application has been limited by constraints associated with peroxide reactivity and stability. We now demonstrate that readily prepared tetrahydropyranyl monoperoxyacetals react with sp3 and sp2 organolithium and organomagnesium reagents to furnish moderate to high yields of ethers. The method is successfully applied to the synthesis of alkyl, alkenyl, aryl, heteroaryl, and cyclopropyl ethers, mixed O,O-acetals, and S,S,O-orthoesters. In contrast to reactions of dialkyl and alkyl/silyl peroxides, the displacements of monoperoxyacetals provide no evidence for alkoxy radical intermediates. At the same time, the high yields observed for transfer of primary, secondary, or tertiary alkoxides, the latter involving attack on neopentyl oxygen, are inconsistent with an SN2 mechanism. Theoretical studies suggest a mechanism involving Lewis acid promoted insertion of organometallics into the O−O bond

    SrSnO 3

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