A diterpene alkaloid from the needles of Taxus baccata

114-11

Alumina-catalysed derivatisation of sesquiterpene lactones

1047-104

Isolation and characterisation of geranylgeraniol

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Sesquiterpenoids from the wood of Cederala toona Roxb; partial synthesis of t-muurolol, t-cadinol and cubenol; structures of δ-cadinene and δ-cadinol

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Phytochemical report: Siderin from Cedrela toona

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Structure of mustakone and copaene

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Studies in sesquiterpenes-XLIX: Sesquiterpenes from Ferula jaeschkeana vatke (Part 1): Jaeschkeanadiol-structure, stereochemistry

A new sesquiterpene diol, now named jaeschkeanadiol, has been isolated from the roots of Ferula jaeschkeana Vatke and is shown to possess structure 1. Its stereochemistry has been established by a direct chemical correlation with laserol

Studies in sesquiterpenes-XXIII: Methylcadalenes-synthesis and characterization

In connection with the characterization of methylcadalenes by modern spectroscopic methods, all five, theoretically possible, methylcadalenes have been prepared by new and simpler procedures. UV, IR and PMR spectra of these compounds are reported and discussed. TLC of isomeric naphthalenes over silica gel impregnated with trinitrobenzene is described

Identification of methylnaphthalenes by PMR: some useful rules

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Molecular rearrangement of photoparthenin by BF<SUB>3</SUB>-etherate-acetic acid complex: X-ray crystal structure of a novel product

The structure of a novel compound,Iupac name: bicyclo [2.4.0]-octa-1,3-dimethyl-2,3-pentan-9-methylene-8, 10-butan-diolide, which resulted on treatment of photoparthenin with BF3-etherate acetic acid, has been established uniquely by X-ray crystallography. C15H18O4 is orthorhombic, space group P212121, with the cell dimensionsa=8.444(1),b=9.964(2),c=16.239(2) &#197;,V=1366.3(2) &#197;3,Z=4,Mr =262.3,D o=1.29,D x=1.28 g cm-3, F(000)=560,T=293K,R=0.065 for 818 observed reflections. &#948;-lactone ring has a skew-boat, &#947;-lactone ring has an envelope, and the remaining six-membered ring has a distorted chair conformation. The four-membered ring is nonplanar. There are two intramolecular and one intermolecular short C-H&#8230;O interactions 2.819, 2.834, and 3.259 &#197;, respectively, which stabilize the crystal structure