![[double bond, length as m-dash]](https://www.rsc.org/images/entities/char_e001.gif)
X): a change of sign The first page of this article is displayed as the abstract.
![Substituent effects on J(Me2C [[double bond, length as m-dash]] X): a change of sign](/en/Image/Get?imageInfo.ImageType=GA&imageInfo.ImageIdentifier.ManuscriptID=C19680001613&imageInfo.ImageIdentifier.Year=1968)
![[double bond, length as m-dash]](https://www.rsc.org/images/entities/h2_char_e001.gif)
X): a change of sign
D. J. Sardella, Chem. Commun. (London), 1968, 1613 DOI: 10.1039/C19680001613
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