Preparation of Potassium Alkoxymethyltrifluoroborates and Their Cross-Coupling with Aryl Chlorides
作者:Gary A. Molander、Belgin Canturk
DOI:10.1021/ol800532p
日期:2008.6.5
A wide variety of alkoxymethyltrifluoroborate substrates were prepared via SN2 displacement of potassium bromomethyltrifluoroborate with various alkoxides in excellent yields. These alkoxymethyltrifluoroborates were effectively cross-coupled with several arylchlorides. This method provides a unique dissonant disconnect that allows greater flexibility in the design of new and improved synthetic pathways
A Highly Efficient Method for the Reductive Etherification of Carbonyl Compounds with Triethylsilane and Alkoxytrimethylsilane Catalyzed by Iron(III) Chloride
Facile reductive etherification of carbonylcompounds can be conveniently performed by reaction with triethylsilane and alkoxytrimethylsilane catalyzed by iron(III) chloride. The corresponding alkyl ethers, including benzyl and allyl ethers, of the reduced alcohols were obtained in good to excellent yields under mild reaction conditions.
Polycarbonate composition having improved resistance to gamma-ray radiation
申请人:TEIJIN LIMITED
公开号:EP0664316A1
公开(公告)日:1995-07-26
A polycarbonate composition having improved resistance to γ-ray radiation, containing 0.01 to 10 parts by weight of a benzyl ether or benzylthioether derivative or the like. This polycarbonate resin composition is almost free from yellowing by γ-ray radiation in air or O2-free atmosphere, and is suitable for use in medical molded articles which are sterilized by γ-ray radiation.
Skeletal rearrangements on chemical ionization of dibenzyl ether and derivatives
作者:Eric E. Kingston、James S. Shannon、Vladimir Diakiw、Michael J. Lacey
DOI:10.1002/oms.1210161003
日期:1981.10
AbstractProtonated molecular ions of dibenzyl ether, formed by chemical ionization using hydrogen and isobutane as reagent gases, undergo skeletal rearrangements to lose water and formaldehyde, both in the ion source and the flight path. The rearrangements have been elucidated by deuterium labelling and chemical substitution. The water lost contains the reagent proton and an aromatic hydrogen atom, and the aromatic hydrogen atoms have been shown to be mobile prior to the reaction. It is proposed that the skeletal rearrangement for water loss is initiated by protonation on the ether oxygen atom, followed by benzyl migration. The formaldehyde lost contains benzylic hydrogen atoms exclusively, and it is proposed that the skeletal rearrangement is preceded by hydrogen rearrangement of an oxygen protonated molecular ion to a ring protonated molecular ion. Daughter ion structures are supported by comparisons of their collision induced dissociation spectra with those of isomeric ions prepared by alternative routes.
Photoredox Cross-Coupling: Ir/Ni Dual Catalysis for the Synthesis of Benzylic Ethers
作者:Idris Karakaya、David N. Primer、Gary A. Molander
DOI:10.1021/acs.orglett.5b01463
日期:2015.7.2
Single-electron transmetalation has emerged as an enabling paradigm for the cross-coupling of C-sp(3) hybridized organotrifluoroborates. Cross-coupling of alpha-alkoxymethyl-trifluoroborates with aryl and heteroaryl bromides has been demonstrated by employing dual catalysis with a combination of an iridium photoredox catalyst and a Ni cross-coupling catalyst. The resulting method enables the alkoxymethylation of diverse (hetero)arenes under mild, room-temperature conditions.