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New polyacetylenes from the sponge Siphonochalina sp.

✍ Scribed by M. Rotem; Y. Kashman

Publisher
Elsevier Science
Year
1979
Tongue
French
Weight
309 KB
Volume
20
Category
Article
ISSN
0040-4039

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✦ Synopsis

Six new compounds, characterized by a long unsaturated alkyl chain (nC22), were isolated from a marine sponge. All compounds except for one, possess an enyne terminus on one side of the molecule and either a terminal acetylene (in four) or a propargyl alcohol on the other end. Four of the compounds were unequivocally identified mainly by spectroscopic methods. Acetylenic compounds are well-known constituents of plants: only few, however, are known from marine organisms and to our knowledge only one group of compounds contains more than a single triple bond. Among the acetylene contalnlng marine natural products are: A group of halogenated ethers, characterized by a straight-chain C-15 carbon skeleton and a terminal enyne function which has been isolated from algae' and a sea hare2, carotenoids 3 , two steroids4, a sesquiterpene' 637 and polyketids . A diacetylene was found in a group of several n C-22 straight-chain compounds isolated from

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