AbstractA catalyst system consisting of the palladium(0) complex Pd2(dba)3 and tri(p‐tolyl)phosphine was found to efficiently promote the decarboxylation of allyl benzoates with formation of allylarenes. This catalytic CO activation followed by extrusion of carbon dioxide and CC bond formation represents a sustainable alternative to traditional waste‐intensive cross‐couplings. The scope of the transformation includes allyl and cinnamyl esters of various ortho‐substituted benzoic acids. For particularly activated substrates, the palladium catalyst can optionally be replaced by an inexpensive nickel complex.magnified image
[Cu(NHC)]-Catalyzed C−H Allylation and Alkenylation of both Electron-Deficient and Electron-Rich (Hetero)arenes with Allyl Halides
作者:Weilong Xie、Sukbok Chang
DOI:10.1002/anie.201510180
日期:2016.1.26
a [Cu(NHC)] (NHC=N‐heterocyclic carbene) catalyst is disclosed for the efficient C−H allylation of polyfluoroarenes using allyl halides in benzene at room temperature. The same catalyst system also promotes an isomerization‐induced alkenylation of initially the generated allyl arenes when the reaction is run in tetrahydrofuran. Significantly, not only electron‐deficient but also electron‐rich (hetero)arenes
Unusually lower barrier to reductive elimination in an 18-electron .eta.3-allyl(organo)nickel(II) complex than those for the 16-electron .eta.3-allyl counterpart and its 16-electron .eta.1-allyl isomer
In spite of a versatile role played by reductiveelimination of v3-allylmetal complexes in organic transformation^,'-^ little has been known concerning the mechanistic details of this step. We wish to report a novel finding that the coupling of allyl and aryl groups on Ni is much more facile in an v3-allyl form with 18electron configuration than in both a 16-electron v3-allyl counterpart and a 16-electron
Photoresist compositions comprising polycyclic polymers with acid labile pendant groups
申请人:——
公开号:US20020128408A1
公开(公告)日:2002-09-12
The present invention relates to a radiation sensitive photoresist composition comprising a photoacid initiator and a polycyclic polymer comprising repeating units that contain pendant acid labile groups. Upon exposure to an imaging radiation source the photoacid initiator generates an acid which cleaves the pendant acid labile groups effecting a polarity change in the polymer. The polymer is rendered soluble in an aqueous base in the areas exposed to the imaging source.