Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Ullmann-type cross coupling

The 1,4-conjugate addition of triorganoindium to enones is promoted by a catalytic amount of Ni(COD)2 (Scheme 8.71) [100], Allylindium reagents can be used in Pd-catalyzed cross-coupling reaction with aryl halides (Scheme 8.72). The Pd-catalyzed allylic substitution of allyl carbonate produces 1,5-dienes (Scheme 8.73) [101]. The indium-mediated palladium-catalyzed Ullmann-type reductive coupling of aryl halides proceeds in aqueous media under air (Scheme 8.74) [102]. [Pg.354]

Over the past century, several methods have been developed for the synthesis of biaryl compounds [7]. Among these are the Ullmann-type coupling [8,9], the Scholl reaction [10], the Gomberg-Bachmann reaction [11], and recently transition-metal-catalyzed cross-coupling reactions [12], In particular, palladium-catalyzed crosscoupling reactions have been successfully applied to the synthesis of biaryls due to their generally high yields and excellent selectivities. [Pg.167]

At last, it should be noted that PAFs, especially synthesized by Yamamoto-type Ullmann cross-coupling, are costly to deploy on a large scale as a carbon capture adsorbent. There is stiU a great challenge to find a more convenient and low-cost synthesis method to prepare PAFs. Besides, the incorporation of useful and novel functions within robust PAFs with ultrahigh surface area remains a formidable challenge and an exciting opportunity for material chemists. [Pg.137]

Yamamoto-type Ullmann Cross-coupling Reaction... [Pg.186]

PAF-1 Yamamoto-type Ullmann cross-coupling 5640 1.4 2.43 Disorder... [Pg.287]

Copper was selected as the metal of choice for the decarboxylation step, IX to X, as it is widely used in protodecarboxylation procedures [39]. However, taking into account the known, limited catalyst productivity and selectivity of copper in Ullmann-type coupling [25], the authors decided to use a second metal for the crosscoupling step. Here, palladium turned out to be the best choice, as it is known for efficient mediation of a large number of two-electron cross-coupling reactions [40]. [Pg.61]


See other pages where Ullmann-type cross coupling is mentioned: [Pg.106]    [Pg.14]    [Pg.106]    [Pg.14]    [Pg.178]    [Pg.211]    [Pg.225]    [Pg.706]    [Pg.52]    [Pg.211]    [Pg.225]    [Pg.509]    [Pg.178]    [Pg.172]    [Pg.95]    [Pg.197]    [Pg.13]    [Pg.38]    [Pg.121]    [Pg.119]    [Pg.120]    [Pg.142]    [Pg.139]    [Pg.147]    [Pg.2]    [Pg.35]    [Pg.186]    [Pg.188]    [Pg.189]    [Pg.193]    [Pg.195]    [Pg.208]    [Pg.63]    [Pg.12]    [Pg.178]    [Pg.60]    [Pg.259]    [Pg.13]    [Pg.38]    [Pg.121]    [Pg.306]    [Pg.115]    [Pg.12]   
See also in sourсe #XX -- [ Pg.14 ]




SEARCH



Ullmann coupling

Ullmann-type coupling

© 2024 chempedia.info