The carotenoid pigments of the Gram-negative bacterium Pseudomonas rhodos were identified as 4,4′-diapocarotene-4-oic acid, di (β,ᴅ-glucosyl) 4,4′-diaptocarotene-4,4′-dioate, and β,ᴅ-glucosyl-4,4′-diapocarotene-4-oate-4′-oic acid. One hydroxy group of the glucose moieties, probably at C (6), was esterified with one of several fatty acids (12:0, 14:0, 14:1, 16:0, 1 6 :1).

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Synthesis of optically active natural carotenoids and structurally related compounds. III. Synthesis of (+)‐abscisic acid, (−)‐xanthoxin, (−)‐loliolide, (−)‐actinidiolide, and (−)‐dihydroactinidiolide The syntheses of (+)‐abscisic acid (1), (−)‐xanthoxin (2), (−)‐loliolide (3), (−)‐actinidiolide (4), and of (−)‐dihydroactinidiolide (5) from one common starting material are reported. The syntheses yield also some enantiomeric or diastereomeric analogues.

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