Seasonal fluctuation of triterpenoid constituents from dried leaflets of dryopteris crassirhizoma
Eight triterpenoids of the hopane and migrated hopane series, and a sterol mixture were isolated from the dried leaflets of Dryopteris crassirhizoma. Seasonal fluctuations in the levels of these compounds from June to October were correlated with biogenesis.
From Bio- to Geohopanoids: an Efficient Abiotic Passage Promoted by Oxygen in the Presence of Cuprous Chloride
In the presence of cuprous chloride, the representative biohopanoid 1a was smoothly converted by oxidation in pyridine into aldehydes, ketones and carboxylic acids with the same skeletons as those of molecular fossils ubiquitously found in the organic mat
Bisseret, Philippe,Rohmer, Michel
p. 7077 - 7080
(2007/10/02)
UNEXPECTED REGIOSPECIFICITY IN PHOTOCHEMICAL α-CLEAVAGE OF HYDRINDANONES.
Triterpene derived trans-hydrindanones 1 of the hopane and lupane series undergo highly regiospecific photochemical α-cleavage; they are cleaved in high yields on the least substituted side of the ketone.The more stable cis-hydrindanones 1 exclusively cleave on the more substituted side as expected.
Trendel, J. M.,Albrecht, P.
p. 1175 - 1178
(2007/10/02)
Synthesis of Biological Markers in Fossil Fuels. 1. 17α and 17β Isomers of 30-Norhopane and 30-Normoretane
21-Hydroxyhopan-3-one was converted to a mixture of 22,29,30-trinor-17α-hopan-21-one and 30-norhopan-22-one by the following reaction sequence: (1) dehydration with phosphorus oxytrichloride, (2) Wolff-Kishner reduction, and (3) ozonolysis.These two keton
Bauer, Philip E.,Dunlap, Norma K.,Arseniyadis, Simeon,Watt, David S.,Seifert, Wolfgang K.,Moldowan, J. Michael
p. 4493 - 4497
(2007/10/02)
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