Z. Samek

Isolation and the structure of deoxopinguisone from the liverwort Ptilidium ciliare

Abstract A pure substance has been isolated from the liverwort Ptilidium ciliare of composition C 15 H 22 O. On the basis of the correlation of its IR and PMR spectra with those of pinguisone (I), it has been assigned structure of deoxopinguisone (II). This was confirmed by comparison with synthetic deoxopinguisone prepared from authentic pinguisone isolated from Aneura pinguis .

The reaction of 1,3-dichloro-1,1,3,3-tetraisopropyldisiloxane with some open chain polyhydroxy compounds

Abstract 1,3-Dichloro-1,1,3,3-tetraisopropyldisiloxane (I) forms an 8-membered ring (IIIa) with glycerol, a 7-membered ring (Va) with D-erythropentose phenylosazone (IV) and linear polymers with 1,4-butanediol resp.

Germacra-1(10),4-diene-cis-6,12-olides: a novel stereochemical group of natural sesquiterpenic lactones from ursinia anthemoides (L.) poiret ☆

Abstract New stereochemical group of germacranolides - germacra-1(20),4-diene-cis-6,12-olides - was identified on the basis of 1H-NMR and X-ray analysis.

Structure of isolaserolide from Laser trilobum

Abstract The structure I has been deduced for isolaserolide on the basis of its PMR spectrum and the chemical correlation with laserolide (II). Isolaserolide is the first elemanolide isolated from the Umbelliferae.