Multiple bonding indium

First complex with indium multiple bond (ln=Se)... 

A unique reaction of allenylindium reagents, prepared from propargyl bromides and indium, and haloazines gives rise to the appropriate allenyl-azines. Although the reaction is not a Heck coupling, but a cross-coupling reaction, the aryl moiety is formally attached to a carbon-carbon multiple bond, therefore we mention it here. 

Reduction or disproportionation of univalent group 13 compounds generally resnlts in the formation of multiple-bonded species, clusters, and metals (eqnation 3). Such reactivity has been exploited for the prodnction of indium nanoparticles (y = 0) by the solvothermal decomposition of Cpln. Similarly, the thermal decomposition of many RM compounds (M = Al, Ga, In) results in the elimination of a portion of the substituents and produces metal-rich group 13 clusters of various sizes the clusters obtained are thonght to be intermediates on the pathway to the formation of bnlk metal. ... 

Besides carbon — carbon multiple bonds, carbon —heteroatom double bonds (C = 0 C = NR) are also capable of undergoing metal-catalyzed [3 4- 2] cycloadditions. However, the simplest class of substrates, i.e. ketones and imines, respectively, could so far only be employed when 2-(trimethylsilylmethyl)prop-2-enyl acetate (1) was used as a TMM synthon. These reactions, which additionally require the presence of cocatalysts such as tin or indium compounds when ketones are used as substrates, lead to the selective formation of 3-methylenetetrahydrofurans and 3-methylenepyrrolidines (3, X = O, N), respectively. ... 

In the past decade much effort in organoindium chemistry has been devoted to study of carbonyl allylation and aUylindation of carbon-carbon multiple bonds with allylic indium reagents. Apart from the conventional transmetalation of allyl-lifhium or aUyl Grignard reagents with indium(III) halides, a method widely used for preparation of allyhndium(III) compounds is the oxidative addition of metallic indium or indium(I) iodide to aUyhc substrates [3, 6]. Transmetalation of allylstan-nane with indium(III) chloride also gives allylindium(III) [7]. Allylindium(I) was recently prepared by transmetalation of allylmercury with metallic indium in water this compound is regarded as an intermediate in the allylation of carbonyl compounds in aqueous media [8]. A new method of preparation of allylic in-dium(III) reagents - reductive transmetalation of a 7r-allylpalladium(ll) complex with indium(I) salts has been reported this enables the use of a wide variety of allylic compounds and solvents [9]. 

The cyclotrimerization of alkynes catalyzed by transition metals is a general method for building substituted benzenes from aliphatic precursors. Multiple bonds are formed in these reactions in a single operation. Although the reaction of thermal trimerization relates to allowed electro-cyclic processes, it is catalyzed by several transition metals, such as Co, Ni, Rh, Pd, Rh, and Ru [38]. Most recent publications show promise for the participation of transition metal complexes in [2+2+2] cycloaddition reactions based on zirconium, titanium, and indium [9]. This reaction has synthetic potential for using metallocyclopentadienes as intermediates in the cyclotrimerization of alkynes. The reaction mechanism is shown in Scheme 2.1 [3, 38]. Two alkyne molecules coordinated to the metal, that is, complex 2.1, couple to form cyclopentadiene 2.2. Next there is either addition of the alkyne to the metallocycle 2.3 to form the metallocycle... 

Another strategy involving tandem radical reactions that offers an advantage of multiple carbon-carbon bond formation in a single operation in the aqueous medium tandem construction of carbon-carbon bonds has been widely being studied by Naito and co-workers (Scheme 7.12). The indium-mediated tandem... 

---