Structure of Formaldoxime

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Abstract
The microwave spectra of cis‐CHDNOH, trans‐CHDNOH, C13H2NOH, CH2N15OH, and CH2NO18H were assigned. Together with the results of previous work on the normal species and CH2NOD, the data give the following planar structure for formaldoxime: bond lengths in Å; CHcis=1.085, CHtrans=1.086, C=N=1.276, NO=1.408, OH=0.956; bond angles; HcisCN 121°46′, HtransCN 115°33′, CNO 110°12′, NOH 102°41′. The most significant feature of the structure is the difference between cis‐ and trans‐HCN bond angles. This ``tilt'' of the methylene group appears to be too large to be attributed to steric repulsion. The C=N and N–O bond lengths are consistent with the Schomaker—Stevenson relation if allowance for resonance is made.

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