Process for the preparation of methylaluminium dichloride

Details Process for the preparation of methylaluminium dichloride Process for the preparation of methylaluminium dichloride

2004-08-13

2008-11-11

Gonzalez, Porfirio Nazario (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Aluminum containing

C568S343000

Reexamination Certificate

active

07449592

ABSTRACT:
A process of preparing methylaluminium dichloride by(i) reacting by heating a material of the formula R3Al2X3, where R is C1-C4alkyl and X is selected from bromine and iodine with an aluminium-containing material selected from metallic aluminium and a mixture of metallic aluminium and aluminium trichloride in an atmosphere of methyl chloride, with the proviso that when R is methyl and X is iodine, the aluminium-containing material is a mixture of aluminium and aluminium trichloride; and(ii) when the aluminium-containing material is metallic aluminium, adding aluminium trichloride to this reaction mixture and heating,to give a crude reaction product; and(iii) if desired, obtaining methylaluminium dichloride from this crude reaction product.The crude reaction product may be used directly in organic syntheses, such as the cyclisation of ψ-Georgywood to give β-Georgywood.

REFERENCES:
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patent: 2848472 (1958-08-01), Cottle
patent: 5707961 (1998-01-01), Bajgrowicz et al.
International Search Report dated Nov. 19, 2004 for application PCT/CH2004/000505.
Written Opinion of the International Searching Authority for application PCT/CH2004/000505.
J. Am. Chem. Soc. 73, 2854 (1951).
Grosse and Mativy inJ. Org. Chem. 5, 106 (1940).
Houben-Weyl “Methoden der organischen Chemie” (Thieme Verlag, 1970), Bd 13/4, pp. 59-78).

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