Aluminium Atoms at High Connectivity Sites in Polyhedral Polyborane Analogous Clusters: From Aluminaboranes to Carbaalanes

New Carbaalanes − (AlMe)8(CCH2Me)5(C≡C−Me) and the THF Adduct (AlMe)8(CCH2Me)5H·2THF

“…[4] As a main product, we isolated the heptaaluminium carbaalane (AlMe) 7 (CCH 2 -Me) 4 H 2 in 63% yield, which possesses the closo-structure 3 shown in Scheme 1. In all of these reactions, we observed the formation of a hitherto uncharacterized by-product [4; Equation (1)], which is almost insoluble in nonpolar solvents such as pentane or toluene and could not be purified by recrystallization. It was isolated as an amorphous and highly pyrophoric powder in about 30% yield.…”

“…These observations are in accordance with the proposed arachno structure, in which four of these substituents are adjacent to the hydrogen-bonded face, while one is opposite to this face. (1) All attempts to recrystallize 4 from dilute solutions in noncoordinating solvents failed. In some cases, we were able to successfully recrystallize carbaalanes from THF, in which they are usually quite soluble and they do not form any kind of stable THF adduct.…”

“…Carbaalanes [1] constitute a new class of compounds containing clusters of aluminium and carbon atoms. They are easily obtained by hydroalumination of dialkylaluminium alkynides using an excess of the corresponding dialkylaluminium hydride.…”

Fluorine functionalized compounds of group 13 elements

“…It had been prepared by the hydroalumination reaction between excess of Me 2 AlH and Me 2 AlCBBCPh at 80 8C for 2 days. The reaction steps involve repeated hydroalumination of the aluminum acetylide and the condensation reaction with the concomitant release of Me 3 Al [35,36]. Based on the discovery of a facile synthesis of carbaalanes by our group, which involves the hydroalumination reaction on monosubstituted acetylenes with AlH 3 ÁNMe 3 [37].…”

Segregation of tetracarbon units in low‐energy tetracarbindane structures: Major differences from their aluminum and gallium analogs

“…Tetracarbindanes, indium clusters, density functional theory, metal-metal bonding 1 | INTRODUCTION Addition of organometallic hydride derivatives of the Group 13 metals aluminum [1][2][3][4] and gallium to the C C triple bonds in alkynes has provided a route to novel metal-carbon clusters including n-vertex clusters with central C 4 M n−4 (M = Al, Ga) units. For aluminum, these clusters include 11-vertex tetracarbalane tetracarbagallanes such as (AlMe) 7 (CEt) 4 (μ-H) 2 and (AlEt) 7 (CCH 2 Ph) 4 (C CPh)(μ-H) based on an 11-vertex central C 4 Al 7 polyhedron with no C C edges (Figure 1).…”