Process for isomerization of oxime ethers

Details Process for isomerization of oxime ethers Process for isomerization of oxime ethers

1990-12-27

1992-07-14

Raymond, Richard L.

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

Organic compounds

Amino nitrogen containing

564253, 564258, 564264, 564265, 564268, C07C24904, C07C24914

Patent

active

051304864

ABSTRACT:
Isomerization of an unsymmetrical ketoxime ether is effected using at least one Lewis acid selected from titanium chloride, titanium bromide, aluminum chloride, aluminum bromide, boron chloride, and boron bromide as isomerizing agents. Examples of the Lewis acid are titanium tetrachloride, titanium trichloride, aluminum trichloride, aluminum tribromide, boron trichloride, and boron tribromide. The ketoxime ether is preferably an anti-isomer or a syn-isomer of a compound represented by the formula (I) or a mixture of the anti-isomer and the syn-isomer: ##STR1## wherein R.sub.1 represents an aryl group, an aralkyl group or an alkyl group and R.sub.2 and R.sub.3 each represents an aralkyl group or an alkyl group, with a proviso that R.sub.1 and R.sub.2 are not identical.

REFERENCES:
patent: 4158015 (1979-06-01), Paul
patent: 4558043 (1985-12-01), Wenk et al.
J. Org. Chem., 20, 1491 (1955).
J. Chem. Soc., Perkin Trans. I, 9, 1691 (1986).

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