Hydrocarbon Activation. Synthesis of β-Cycloalkyl (Di)nitriles through Photosensitized Conjugate Radical Addition
作者:Anna Maria Cardarelli、Maurizio Fagnoni、Mariella Mella、Angelo Albini
DOI:10.1021/jo010400k
日期:2001.11.1
Photoinduced hydrogen abstraction from aliphatic cyclic hydrocarbons (C(5) to C(7), C(12), as well as adamantane) by triplet aromatic ketones in the presence of alpha,beta-unsaturated (di)nitriles offers a straightforward entry to the corresponding alkylated (di)nitriles via the alkyl radicals. Yields are moderate to good depending on the olefins structure (substitution in beta slows down the addition
A New Coupling Reaction of Alkyl Iodides with Electron Deficient Alkenes Using Nickel Boride (cat.)−Borohydride Exchange Resin in Methanol
作者:Tae Bo Sim、Jaesung Choi、Meyoung Ju Joung、Nung Min Yoon
DOI:10.1021/jo961751f
日期:1997.4.1
addition reaction of alkyliodides with alpha,beta-unsaturated esters, nitriles, and ketones proceeds in moderate to excellent yields (50-95%) using Ni(OAc)(2) (0.05-0.2 equiv)-BER (3-5 equiv) in methanol in 1-9 h at room temperature or at 65 degrees C. Nickel boride on borohydride exchange resin (BER) is a good alternative reagent to tributyltin hydride for the coupling of alkyliodides with the electron
Dimeric Metal Complexes as Mediators for Radical C?C Bond-Forming Reactions
作者:Bernd Giese、Gebhard Thoma
DOI:10.1002/hlca.19910740523
日期:1991.8.7
(2) in the presence of alkyl halides leads to C-centered radicals which can be trappedby alkenes and yields saturated and/or unsaturated addition products. Carbon radicals are generated via halogen abstraction by the initially formed metal-centered radicals resulting from homolysis of the metal-metal bond of dimericmediators 1 and 2. No reaction occurs using octacarbonyldicobalt (3).
Silane3 is an effective mediator in organic synthesis via radicals. Reactions with this silane give smaller amounts of unwanted reduction products than reactions with toxic stannanes.
Bis(tri-n-butylstannyl)benzopinacolate: Preparation and use as a mediator of intermolecular free radical reactions
作者:David J. Hart、Ramanarayanan Krishnamurthy、Lori M. Pook、Franklin L. Seely
DOI:10.1016/s0040-4039(00)61484-3
日期:1993.12
Bis(tri-n-butylstannyl)benzopinacolate (2) serves as a thermal source of tri-n-butylstannyl radicals and mediates intermolecular coupling of selected alkyl halides to O-benzylformaldoxime and electron deficient olefins. A free radical non-chain mechanism is proposed for these reactions.