Phytoecdysones ofRhaponticum integrifolium III. Integristerone B
SummaryFrom the flower heads ofRhaponticum integrifolium we have isolated a new phytoecdysone — integristerone B. It has been shown that it is 1β, 2β, 3β, 5β, 14α, 20R, 22R, 25-octahydroxy-5β-cholest-7-en-6-one.
Phytoecdysones ofRhaponticum integrifolium IV. 24(28)-Dehydromakisterone A
SummaryA new phytoecdysone has been isolated from the flower heads ofRhaponticum integrifolium, and for it the structure of 24(28)-dehydromakisterone A has been established.
Extraction of ponasterone A and ecdysterone from podocarpaceae and related plants.
Abstract A general procedure for extracting substances possessing insect moulting hormone activity, i.e., certain polyhydroxy steroids, from plant leaves is described. The screening of plants closely related to Podocarpus Nakaii for the ecdysones and ponasterones has led to the isolation of ponasterone A from P. macrophyllus , P. chinensis , and Taxus cuspidata , and the isolation of ecdysterone from P. macrophyllus and Taxus cuspidata .