Zur Chemie der Proto-und allo-Proto-lichesterinsäure / Contribution to the Chemistry of Proto- and allo-Proto-lichesterinic Acids

The isolation and spectroscopic characterization of (-)-allo-proto-lichesterinic acid from Cetraria komarovii is described. Proto-lichesterinic and allo-proto-lichesterinic acids are transformed into numerous nitrogen-containing derivatives and the isomerization of the dihydro acids is investigated.