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It is shown unequivocally by chemical correlations (cf. Schemes 1‐‐3) and Raman optical activity spectra (cf. Fig. 1 and 2) that the (R)‐configuration has to be attributed to (+)‐1‐methylindane ((+)‐1). This is in contradiction to an earlier assignment of the (R)‐configuration to (−)‐1[2] which was based on the (R)‐configuration of (+)‐indane‐1‐carboxylic acid (3) [11].
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Hansen et al. (1979) studied this question.
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