Reactions Organoaluminium chemistry

1 reactions

1.1 lewis acidity
1.2 electrophiles
1.3 alkene polymerization

reactions

the high reactivity of organoaluminium compounds toward electrophiles attributed charge separation between aluminium , carbon atom.

lewis acidity

organoaluminium compounds hard acids , readily form adducts bases such pyridine, thf , tertiary amines. these adducts tetrahedral @ al.

electrophiles

the al–c bond polarized such carbon highly basic. acids react give alkanes. example, alcohols give alkoxides:

alr 3 + roh → 1/n (r 2al−or)n + r h

a wide variety of acids can employed beyond simple mineral acids. amines give amido derivatives. carbon dioxide, trialkylaluminium compounds give dialkylaluminium carboxylate, , subsequently alkyl aluminium dicarboxylates:

alr3 + co2 → r2alo2cr
r2alo2cr + co2 → ral(o2cr)2

the conversion reminiscent of carbonation of grignard reagents.

similarly, reaction between trialkylaluminum compounds , carbon dioxide has been used synthesise alcohols, olefins, or ketones.

with oxygen 1 obtains corresponding alkoxides, can hydrolysed alcohols:

alr3 + 3/2 o2 → al(or)3

a structurally characterized organoaluminum peroxide [{hc[c(me)n-c6h5]2}al(r)-o-o-cme3] [r=ch(sime3)2].

the reaction between pure trialalkylaluminum compounds , water, alcohols, phenols, amines, carbon dioxide, sulfur oxides, nitrogen oxides, halogens, , halogenated hydrocarbons can violent.

alkene polymerization

industrially, organoaluminium compounds used catalysts alkene polymerization polyolefins, example catalyst methylaluminoxane.