Mass spectroscopy of natural products. II—allogibberic acid—A model for the skeletal fragmentation of the molecular ions of GA3 type gibberellins
✍ Scribed by D. Voigt; G. Adam; J. Schmidt; P. Franke
- Publisher
- John Wiley and Sons
- Year
- 1978
- Tongue
- English
- Weight
- 373 KB
- Volume
- 13
- Category
- Article
- ISSN
- 1076-5174
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✦ Synopsis
The positive ion mass spectrum of dogibberic acid was examined and fiagmentation routes involving the carbon skeleton are proposed on the basis of mass measurements and metastable ion observations. The results are compared with the mass spectra of 3-hydroxy-epidogihberic acid, as well as gibberellin A, (GA,), 3-epi-GA,, 3-dehydro-GA, and iso-GA,, the latter compounds all being capable of undergoing ammathtion o f ring A giving a key ion corresponding to the molecular ions of the allogibberic acid and 3-hydroxy-epiaUogiiberic acid models, respectively. All the gibberellin derivatives investigated show the same fragmentation of the skeleton. Thus, the behaviour under electron impact of the GA, type gibberelk follows a general pattern.