Search engine for discovering works of Art, research articles, and books related to Art and Culture
Javascript must be enabled to continue!
Extractives of Australian timbers. VI. Ebelin lactone
View through CrossRef
Ebelin lactone, formed by hydrolysis of a saponin, is a carbotricyclic triterpene with a novel carbon skeleton. Chemical evidence leading to the structure (I) for ebelin lactone is now presented in detail. Ebelin lactone, C30H46O3, possesses a secondary, equatorial hydroxyl group shown to be the 3β-hydroxyl group located in a typical triterpene ring A (III). Spectroscopic and chemical results show that the remaining two oxygen atoms are present in a γ-lactone ring (XIII). The side- chain has been subjected to oxidative degradations; an examination of the volatile fragments, and the isolation and characterization of the non-volatile C22 octanor compounds indicate that the side-chain has one of four possible structures (XVII). Structure (XVIII) is preferred on biogenetic grounds. The side-chain is attached equatorially; the conjugated triene system is allotted the trans arrangement of the double bonds on spectroscopic evidence. The biogenesis of ebelin lactone is discussed.
Title: Extractives of Australian timbers. VI. Ebelin lactone
Description:
Ebelin lactone, formed by hydrolysis of a saponin, is a carbotricyclic triterpene with a novel carbon skeleton.
Chemical evidence leading to the structure (I) for ebelin lactone is now presented in detail.
Ebelin lactone, C30H46O3, possesses a secondary, equatorial hydroxyl group shown to be the 3β-hydroxyl group located in a typical triterpene ring A (III).
Spectroscopic and chemical results show that the remaining two oxygen atoms are present in a γ-lactone ring (XIII).
The side- chain has been subjected to oxidative degradations; an examination of the volatile fragments, and the isolation and characterization of the non-volatile C22 octanor compounds indicate that the side-chain has one of four possible structures (XVII).
Structure (XVIII) is preferred on biogenetic grounds.
The side-chain is attached equatorially; the conjugated triene system is allotted the trans arrangement of the double bonds on spectroscopic evidence.
The biogenesis of ebelin lactone is discussed.
Related Results
British Food Journal Volume 46 Issue 12 1944
British Food Journal Volume 46 Issue 12 1944
1. The Committee have received a request from the Tea and Coffee Division for advice as to appropriate standards for liquid “coffee essences” including coffee and chicory essences,...
Extractives of Australian timbers. X. Autoxidation and other reactions of the conjugated side-chain of eberlin lactone. Isolation of a new isomer of ebelin lactone
Extractives of Australian timbers. X. Autoxidation and other reactions of the conjugated side-chain of eberlin lactone. Isolation of a new isomer of ebelin lactone
The conjugated triene side-chain of ebelin lactone has been degraded in a stepwise manner using osmium tetroxide. A new isomer of ebelin lactone has been isolated from the sapogeni...
Trooping the (School) Colour
Trooping the (School) Colour
Introduction
Throughout the early and mid-twentieth century, cadet training was a feature of many secondary schools and educational establishments across Australia, with countless ...
Reclaiming the Wasteland: Samson and Delilah and the Historical Perception and Construction of Indigenous Knowledges in Australian Cinema
Reclaiming the Wasteland: Samson and Delilah and the Historical Perception and Construction of Indigenous Knowledges in Australian Cinema
It was always based on a teenage love story between the two kids. One is a sniffer and one is not. It was designed for Central Australia because we do write these kids off there. N...
“The Earth Is Dying, Bro”
“The Earth Is Dying, Bro”
Climate Change and Children
Australian children are uniquely situated in a vast landscape that varies drastically across locations. Spanning multiple climatic zones—from cool tempe...
Upgrading the durability of perishable wood species using extractives from side streams of durable wood sawmill operations: a review
Upgrading the durability of perishable wood species using extractives from side streams of durable wood sawmill operations: a review
Abstract
Natural durability is one of the most rated features in wood end-use applications. In fact, several precious native tropical wood species produce timber of ...
Access Denied
Access Denied
Introduction
As social-distancing mandates in response to COVID-19 restricted in-person data collection methods such as participant observation and interviews, researchers turned t...
Chemical Composition of Native and Ammonia Fiber Expansion Pretreated Rice Straw-Unextracted versus Extractives-free Material
Chemical Composition of Native and Ammonia Fiber Expansion Pretreated Rice Straw-Unextracted versus Extractives-free Material
Characterization of chemical composition for lignocellulosic biomasss (LCB) is essential in the conversion process of LCB to bioenergy and biochemicals. Accurate quantification of ...