Their preparation involves an alkylation of an aromatic ring, for example, such as a Friedel-Crafts alkylation with 4-bromomethyl-3,5-dibromo-2,6-dimethylphenol or with 4-hydroxymethyl-3,5-dibromo-2,6-dimethylphenol.メンドザアベルフリッツ...
arenesalkenylationalkylationC−H activationpalladiumTo expand the scope of meta‐functionalization, a pyrimidine‐based template effective for the formation of β‐aryl aldehydes and ketones, using allyl alcohols, by meta‐C?H activation of benzylsulfonyl esters is described. In addition, α,β‐...
A ruthenium-catalyzed meta-selective C-Ar-H bond difluoroalkylation of 2-phenoxypyridine using 2-bromo-2,2-difluoroacetate has been developed. Mechanistic studies indicated that this difluoroalkylation might involve a radical process. Furthermore, a new method is reported for the synthesis of 2-...
Highly enantioselective iron-catalyzed C−H alkylations by inner-sphere C−H activation were accomplished with ample scope. High levels of enantiocontrol proved viable through a novel ligand design that exploits a remote meta-substitution on N-heterocyclic carbenes within a facile ligand-to-ligand...
alkylation catalyst; (2) allowing the cumene and propylene in the feed stream to react together to produce a first mixture of para-diisopropylbenzene and meta-diisopropylbenzene; (3) fractionally distilling the mixture of para-diisopropylbenzene and meta-diisopropylbenzene in a fractional ...
A process for producing an alkylated aromatic product having high selectivity to the thermodynamically preferred isomer by contacting meta- xylene and a C.sub.13 to C.sub.20 alpha-olefinic compound at a reaction temperature of about 40° to about 80° C. in the presence of a catalyst ...
Their preparation involves an alkylation of an aromatic ring, for example, such as a Friedel-Crafts alkylation with 4-bromomethyl-3,5-dibromo-2,6-dimethylphenol or with 4-hydroxymethyl-3,5-dibromo-2,6-dimethylphenol.
The isopropylation of large molecules like meta DIPB (Diisopropylbenzene) is a reaction wherein the formation of isomeric DIPB s & isomeric TIPB s (Triisopropylbenzene) signify the pore dimensions and the structural properties. Thus isomerization is the major reaction in Hß, whereas isomerization...
A Pd/norbornene-catalyzed direct meta -alkylationof nosyl-protected phenylalanine derivatives with alkyl iodides isreported in moderate to good yields. The use of diisopropyl bicyclo[2.2.1]-hept-5-ene-2,3-dicarboxylateis identified as a more suitable transient mediator. A simple pyridineligand is ...
Alkylation of metaxylene with isobutylene using a solid active clay catalyst produces 5-tert-butyl-metaxylene with high isomer selectivity with respect to 4-tert-butyl-metaxylene. The process is controlled to extend catalyst life and significantly reduce environmentally unfriendly waste....