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508-59-8

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Enantioselective synthesis of neoambrosin, parthenin, and dihydroisoparthenin
Enantioselective synthesis of the titled ambrosanolides is described. Use of the trimethylsilyl group as an anchor contributed to the stereoselective introduction of two methyl groups.
Asaoka, Morio,Ohkubo, Taketoshi,Itahana, Hirotsune,Kosaka, Takatoshi,Takei, Hisashi
p. 3115 - 3128
(2007/10/02)

Conversion of parthenin to epi-allodamsin
Anhydroparthenin (III), obtained from parthenin (I), when treated with dimethylamine is cleaved at the lactone ring and finally affords isomeric diadducts IV and V, formed by the addition of 2 moles of amine to carbonyl carbon and exomethylene carbon.The diadduct (IV) after catalytic hydrogenation and relactonisation gives a compound characterised as epi-allodamsin which is epimeric with damsin at C-1 and C-10.
Bhat, Uppoor G.,Kulkarni, Mandakini M.,Rojatkar, Supada R.,Nagasampagi, Bhimsen A.
p. 543 - 546
(2007/10/02)

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Chemical Properties

Melting Point: 163-166°
Boiling Point: 466.9°C at 760 mmHg
Flash Point:177.3°C
Density: 1.25g/cm³
Vapor Pressure: 1.12E-10mmHg at 25°C
Refractive Index: 1.4300 (estimate)
PKA: 12.69±0.60(Predicted)
PSA: 63.60000
LogP: 1.39040

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