Aldoximes bond angles

FIGURE 7. Histograms showing distributions of calculated gas phase H—C—R and R —C—R" bond angles in the aldoximes and ketoximes in Table 2. Horizontal axes are the same in both cases... 

The molecular geometries of oximes in crystals are quite similar to those in the gas phase. The central carbons are planar. The C=N double bonds are primarily between 1.27 and 1.29 A in length (Figure 12) and the C—N—O angles are mostly 110°-114° (Figure 13). These histograms, which combine aldoximes and ketoximes, are based on data taken from Bertolasi and coworkers . For comparison, Allen and coworkers give the mean C=N distance in a collection of 67 crystalline oximes as 1.281 A, with a median of 1.280 A and standard deviation 0.013 A. ... 

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