The previously described 1-methylindane-2-carboxylic acid (II), prepared by the reduction of 3-methylindene-2-carboxylic acid (I) with sodium amalgam, has been shown to be a mixture of the cis- and trans-isomers. When the indene acid (I) was reduced catalytically only the cis-isomer (IIa) was obtained. The preparations of the corresponding cis- and trans-2-amino- and 2-carbamoyl derivatives are described.
R. S. Shadbolt, J. Chem. Soc. C, 1970, 920 DOI: 10.1039/J39700000920
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