Chemistry of lichen constituents. Part IV
β Scribed by R.M. Letcher; S.H. Eggers
- Book ID
- 104241103
- Publisher
- Elsevier Science
- Year
- 1967
- Tongue
- French
- Weight
- 221 KB
- Volume
- 8
- Category
- Article
- ISSN
- 0040-4039
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β¦ Synopsis
Skeletal rearrangement under electron impact conditions is of particular significance in the application of mass spectrometry to structure elucidations. In the course of our investigation of the mass spectra*of pulvic acid derivatives [I -V], certain characteristic rearrangements were observed.
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The mass spectra of three methoxypulvic dilactones, four methyl esters of methoxypulvic acids and five methyl ethers of pulvic acid derivatives have been measured and rationalised empIoying accurate mass measurements and metastable peak assignments to substantiate the proposed fragmentations and rea
Tetrafluorobensyne shows high reactivity in the formation Of Mels-Alder adducts in good yields with a variety of aromatic substrates. 1,2 It Is of interest, therefore, to compare the reactivity of tetrachlorobenzyne with that of tetrafluorobensyne. The recent suggestions that products obtained from
Extraction of the lichen Parmelia cryptochhrophaea Hale gave cryptochlorophaeic acid (2.5 per cent), chloroatranorin (0.16 per cent), and caperatic acid (1.7 per cent).