Oxime geometry, importance

The Beckmann rearrangement of oximes affords amides which may be hydrolysed or reduced to form amines. The geometry of the oxime is important in directing the course of the rearrangement and hence in defining which amide might be obtained (Scheme 2.32). 

Sparingly soluble metal fluoride such as CsF or Ki-. The geometry of the oxime and the orientation of the chlorine are not important, but the (E)-enol ether undergoes cyclization more rapidly than the (Z)-isomer. 

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