Process for making ethers from alkoxide anions or precursors...

C - Chemistry – Metallurgy – 07 – C

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C07C 41/16 (2006.01) C07C 43/11 (2006.01)

Patent

CA 2700602

Improved methods for making ethers. In particular, an alkoxide can be more effectively converted into an ether by reaction with a hydrocarbyl halide in the presence of a substantial excess of a hygroscopic base such as NaOH. When present in such an unconventional excess, the base serves multiple functions. As a consequence, the alkoxide is extensively converted to the desired ether rapidly at excellent yields. The reaction environment also aids later product isolation. The use of the NaOH rather than Na metal allows the ether product to be separated from water soluble impurities such as salt products, left over base, left over hydrocarbyl halide, formates, etc. by liquid-liquid extraction among aqueous and organic phases.

L'invention porte sur des procédés améliorés de fabrication d'éthers. L'invention permet, en particulier, de convertir avec une plus grande efficacité un alcoxyde en un éther, par la réaction avec un halogénure d'hydrocarbyle en présence d'un excédent sensible d'une base hygroscopique telle qu'un NaOH. Lorsqu'elle est présente en un tel excédent peu courant, la base remplit plusieurs fonctions. Elle permet par conséquent de convertir rapidement et entièrement l'alcoxyde en l'éther désiré avec d'excellents rendements. L'environnement réactionnel facilite également l'isolement ultérieur du produit. L'utilisation du NaOH plutôt que du métal Na permet de séparer le produit éther des impuretés hydrosolubles telles que les produits du sel, la base restante, l'halogénure d'hydrocarbyle restant, les formates, etc., par une extraction liquide-liquide entre les phases aqueuse et organique.

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