2-benzopyrylium salts. XXXVII. Oxygen an
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Irina V. Shcherbakova; Evghenii V. Kuznetsov; Iosif A. Yudilevich; Olga E. Kompa
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Article
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1988
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Elsevier Science
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French
β 465 KB
The weak intensity of the CN stretching band in IR spectra for l-ayanoiso chromenes is obviousZy determined by the steric position of the CN group in the rroZecuZe, as it was estabUshed by X-ray structuraZ anclysis for the ayanide addition product (2d) of l-isopropyZ-3-methyZ-2-benzopyryZium sclts.