The synthesis and identification of alkenyl and alkadienyl catechols of Burmese lac

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Abstract
The presence of (Z)-(4), (E)-3-(heptadec-8′-enyl)-(5), (Z)-4-(heptadec-8′-enyl)-benzene-1,2-diol (47), (Z,Z)-3-(heptadeca-8′,11′-dienyl)-(1), and (Z,Z)-4-(heptadeca-8′,11′-dienyl)-benzene-1,2-diol (3) in Burmese lac, the sap of Melanorrhoea usitata, has been confirmed by the synthesis of these compounds, and of their methyl ethers, and a comparison of the gas chromatographic retention times of their bis-o-(trimethylsilyl) ethers with the derivatives of the natural products.