Structural investigations of substituted methylenemalonaldehydes by X-ray crystallography and NMR spectroscopy
1987 ◽
Vol 52
(3)
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pp. 714-726
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Keyword(s):
X Ray
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Crystal and molecular structure of three substituted methylenemalonaldehydes I-III was studied. The spatial arrangement of the monosubstituted derivative I differs significantly from that of the disubstituted methylenemalonaldehydes II and III, not only in the solid state conformation of the malonaldehyde fragment but also in the length of the ethylenic C=C double bond and in its distorsion. The structures found in crystal are compared with conformations in solutions determined by NMR spectroscopy.