Abstract. The syntheses of (I70)phenol from ( I70)water, ( I'0)phenol from ( 180)water, ( I-l3C)-phenol and (4-13C)phenol from (2-13C)acetone and (2-13C)phenol and (3-I3C)phenol from ( I-l3C)-acetone with high isotopic enrichment are described. The labelled phenols are converted into their corresponding L-tyrosines by the bacterium Erwinia herbicola. A full analysis of the 'H and I3C NMR spectra of phenol and L-tyrosine is reported.

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Treatment of the diazoacetoacetamides (I), (III), and (VI) with catalytic amounts of dirhodium tetraacetate leads selectively to the formation of the β‐lactams (II), (IV), and (V) or (VII).