The NMR spectra of trans‐ (A) and cis‐3‐methyl‐trans‐l‐phenylallyl anion (B), of cis‐l‐methylpentadienyl anion and of cis‐l‐methyl‐5‐oxapentadienyl anion are described. A is obtained by abstraction of a proton from l‐phenyl‐trans‐2‐butene at low temperature. At 0° it largely isomerizes to B. Several aspects of the configuration of these anions are discussed.
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Heiszwolf et al. (1969) studied this question.
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