Jungermannia rosulans

Bazzania pompeana Marchantia polymorpha Jungermannia rosulans Biota orientalis (higher plant)... 

From Jungermannia rosulans, two new cuparane-type sesquiterpenes, cuprenenol (267) and rosulantol (268) have been isolated together with ( + )-cuparene [ = enantiomer of (269)] and ( + )-2-hydroxycuparene [ = enantiomer of (271)] (245). Structure and configuration were assigned to (267) by chemical correlation with (+ )-cuparene, on the basis of the negative Cotton effect exhibited by the a, P-unsaturated ketone (288) derived from (267), and by applying the benzoate rule to diol (292) obtained from an epoxyalcohol (291) (Scheme 33). 

From the comparative study of the diterpenoids, the genus Jungermannia is divided into two types a labdane-pimarane-type (erect stem type, such as Jungermannia rosulans, J. thermarum and J. torticalyx) and a kaurane-type [creeping stem type, J. infusca and J. tristis ( = /. atrovirens)] (228). 

Matsuo, A., I. Terada, M. Nakayama, and S. Hayashi Cuprenenol and Rosulantol, a New Cuparane Class Sesquiterpene Alcohols from the Liverwort Jungermannia rosulans. Tetrahedron Letters 1977, 3821. 

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