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Two new derivates of iso‐orientin have been isolated and identified from the leaves of Gentiana burseri, LAPEYR. The structure of the new compounds were established as: trans‐cafeoyl‐2″‐iso‐orientin (1) and p‐β‐D‐glucosyl‐trans‐cafeoyl‐2″‐iso‐orientin‐4′‐O‐β‐D‐glucoside (2).

The volumes of mixing for the systems cyclopentane + cyclohexane, cyclopentane + cycloheptane, cyclohexane + cycloheptane (at 20°C), and cyclopentane + cyclooctane, cyclohexane + cyclooctane, cycloheptane + cyclooctane (at 30 °C) have been measured with a dilatometer. All systems show volume contractions, except the first. The energies of mixing are also given. They vary from 7 to 55 J/mol for equimolar solutions.

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