The structure of anti-e-bromoacetophenone oxime (CsHsNOBr) was solved by Fourier methods and refined by full-matrix least-squares analysis to a final RI = 0.046; space group: 14, Z= 8. The distances and angles are similar to those observed in other oxime structures. The phenyl group and the oxime function are not coplanar, the angle between their normals being 54.3 °. Molecules are linked into tetramers by O-H.--N hydrogen bonds about an $4 axis at -}, 0, z, with both the oxygens and nitrogens assuming nearly tetrahedral arrangements. A cluster of four bromine atoms make van der Waals contacts of 3.681 ,~ about an $4 axis at 0, 0, z.

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NOTES 623 obtained by Knoevenagel condensation of crotonaldehyde and benzaldehyde with acetoacetic ester yielded only polymeric materials instead of the anticipated sorbic and cinnamic esters. It is suggested that allylic resonance may account for the failure of such esters to undergo the cleavage: CH; o-C=CHR ¿O2C2H5 0-CH3C=C-CHR dc 302C2H6EXPERIMENTAL at the allylic position. The yields in the A-bromo--butylamine reaction under certain conditions are comparable to those of the A-bromosuccinimide reaction.2In the study of the allylic brominating ability of A-bromo-i-butylamine, cyclohexene was used as the olefin, the concentrations of the reagents and the type of solvent were varied, and the effect of azobisisobutyronitrile (AIBN) was studied. Light seemed to be inferior to AIBN as an initiator, and therefore was not investigated further. Our results appear in Table I.

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