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Two new 6-alkylcoumarins from Angelica pubescens f. biserrata
Planta Medica
|October 1, 1995
Abstract:
Two new 6-alkylcoumarins, angelitriol (1) and angelol J (2), were isolated from the EtOAc-soluble fraction of the roots of Angelica pubescens Maxim f. biserrata Shan et Yuan. Their structures were elucidated as 6-[(1R,2S)-1,2,3-trihydroxy-3-methylbutyl]-7-methoxycoumarin (1) and 6-[(1R,2R)-1-ethoxy-2,3-dihydroxy-3-methylbutyl]-7-methoxycoumarin (2), respectively, on the basis of spectral evidence. Both of them showed strong inhibitory effects on human platelet aggregation.
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01:18π Molecular Orbitals of the Allyl Cation and Anion
An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with an...
01:27π Molecular Orbitals of the Allyl Radical
Allyl radicals are three-carbon conjugated systems. They are readily formed as intermediates in halogenation reactions of alkenes involving the addition of halogen to the allylic carbon instead of the double bond. As seen in allyl cations and anions, each of the three sp2-hybridized carbon atoms in allyl radicals has an unhybridized p orbital. These orbitals combine to give three π molecular orbitals.
The allyl systems have identical molecular orbitals but differ in the number of π electrons.
The allyl systems have identical molecular orbitals but differ in the number of π electrons.