Aluminum bis

Methylaluminum bis(4-bromo-2,6-di-tert-butyiphenoxide) Aluminum, bis[4-bromo-2,6-bis(1,1-dimethylethyl)phenolato]methyl- (12) (118495-99-1)... 

C64H82AIBN2O4, Aluminum, bis(tetrahydrofur-an)-l,2-bis(2-hydroxy-3,5-bis(tert-butyl)-benzyhdeneimino)ethane-, tetraphenylborate, 34 19... 

Butylmagnesium bromide-Methyl-aluminum bis(2,6-di-/-butyl-4-methyl-phenoxide), 203... 

Diisobutyl(iodomethyl)aluminum, 114 Dimethylaluminum chloride, 5 Ethylaluminum dichloride, 5, 44, 306 Ethylmagnesium bromide-Methyl-aluminum bis(2,4,6-tri-r-butyl-phenoxide), 203 Isobutyl(2,4,6-tributylphenoxy)-aluminum trifluoromethanesulfonate, 113... 

Fig. 13. Molecular structure of [Me3SiOAl(BH4)2]2, dimeric trimethylsilyloxy-aluminum-bis(tetrahydroborate) [33]...

The choice of Lewis acid promoter for these reactions can change the sense of asymmetric induction. " For example, tandem [4 + 2]/ [3 + 2] cycloadditions (eq 4) mediated by Ti(0-i-Pr)2Cl2, followed by hydrogenolysis afforded tricyclic (-)-a-hydroxy lactam [(-)-8] in 98% ee. When mediated by methyl-aluminum-bis(2,6-diphenylphenoxide) (MAPh), the same reaction gave (+ )-8 in 93% ee. Importantly, the observed selectivity is not chiral auxiliary dependent. Rather, it is attributed to a highly endo selective cycloaddition in the case of Ti compared to high exo selectivity in the case of MAPh. 

Aluminum tris(2,6-diplienylphenoxide) (ATPH), an aluminum-based Lewis acid with bulky substituents, is valuable as an extremely selective activator of less hindered aldehyde carbonyls (Scheme 10.8) [36]. In competitive aldol reactions of two different aldehydes, more fhan one equivalent of ATPH achieves highly chemoselective functionalization of less hindered aldehydes. Unfortunately, catalytic use of ATPH reduces the chemical yield and chemoselectivity. In contrast, a catalytic quantity of aluminum bis(trifluoromethanesulfonyl)amide 13 can promote the chemoselective aldol reaction. 

Aluminum bis-(N-methylpiperazino)hydride, obtained by combining 2 equivalents of N-methylpiperazine and a solution of AIH3 in THF, is especially recommended for the reduction of esters or acids to aldehydes (Sections 3.2.5, 3.2.6) [MM3]. 

The first example of this type of living-radical polymerization was reported by Sawamoto, who used a ruthenium metal complex in association with methyl-aluminum bis(2,6-di- ert-butylphenoxide), as an accelerator, to polymerize methyl... 

CAS 142-03-0 EINECS/ELINCS 205-518-2 Synonyms Aluminum acetate Aluminum acetate basic Aluminum, bis (acetato-0) hydroxy- Aluminum diacetate hydroxide Aluminum hydroxyacetate Aluminum subacetate Basic aluminum acetate Bis (acetato-O) hydroxyaluminum Hydroxy aluminum diacetate Mordant rouge Classification Salt Empirical C4H7AIO5 Formula AI(0H)(CH3C02)2 Properties Wh. amorphous powd. insol. in water sol. in water if freshly prepared forming acidic sol ns. m.w. 162.08 m.p. 54 C Toxicology Skin irritant... 

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