Stoffwechselprodukte von Mikroorganismen. 89. Mitteilung [1]. Synthese von zwei diastereomeren 2, 4, 6‐Trimethylpimelinsäuren. Ein Beitrag zur Stereochemie des Borrelidins

By conventional methods a mixture of diastereomeric 2,4, 6‐trimethylpimelic acids was prepared and separated by counter‐current distribution. The two meso ‐compounds were isolated in crystalline form, one of them (m.p. 130°) giving a dimethyl ester identical with a degradation product of the antibiotic borrelidin. The chirality (2‐ R ,4‐ r ,6‐ S ) of the acid of m.p. 130° was determined by an X‐ray structural analysis (see following paper).