Mass spectra of tetrahydroprotoberberine methines
✍ Scribed by L. Dolejš; J. Slavík
- Publisher
- John Wiley and Sons
- Year
- 1970
- Tongue
- English
- Weight
- 137 KB
- Volume
- 3
- Category
- Article
- ISSN
- 1076-5174
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📜 SIMILAR VOLUMES
## Abstract 9‐Methoxytetrahydroprotoberberines are found to exhibit pronounced (__M__OCH~3~)^+^ ions in their mass spectra as opposed to isomers or homologs lacking such substitution, yet carrying methoxyl substituents at other sites. Locating such substituents originally present, or produced from
The reaction of a ratio of 1 mole of 5-chloro-3-methyl-1-phenyl pyrazolo-4[2(4)]-dimethine cyanine (1a,b) or (5-chloro-4-formyl-3-methyl-1-phenylpyrazole) 2 with 2 moles of an appropriate 2(4)-heterocyclic quaternary salt afforded the novel pentamethine cyanine dyes (3a-3e). Other reactions of 2 wit