ChemInform Abstract: Catalysis at Ciba‐Geigy

Abstract

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Use of a recyclable poly(N-vinyl carbazole) palladium(II) complex catalyst: Heck cross-coupling reaction under phosphine-free and aerobic conditions

“…Activated aryl bromide like p-bromonitrobenzene and p-bromoacetophenone bearing electron withdrawing group reacted with styrene and methyl acrylate to generate the corresponding (Table 5, entries 10,11,26,27). For deactivated aryl bromides, p-bromoanisole and p-bromotoluene bearing electron donating group in their para position, lower yields were obtained under the present reaction conditions (Table 5, entries 8,9,24,25). The coupling of ortho-substituted bromobenzene having nitro group gave the corresponding coupling product with styrene and methyl acrylate in 83 and 76% yield, respectively (Table 5, entries 15,30).…”

“…The reaction has been applied to many areas, including natural products [6][7][8] and fine chemicals synthesis [9][10][11]. Usually, aryl halides are reacted with alkenes in the presence of palladium and a suitable base.…”

Application of dimeric cyclopalladated complex of tribenzylamine as an efficient catalyst in the Heck cross-coupling reaction

“…The Heck reaction has received considerable attention, primarily due to the enormous synthetic potential to generate sp 2 esp 2 carbonecarbon bonds [1]. However, the reaction suffers from limitations that have so far precluded many industrial applications [2]. Typically, a relatively large amount of catalyst (1e5 mol%) is needed for reasonable conversions and often catalyst recycling is hampered.…”