Anthoxanthins. Part I. Selective methylation and demethylation
β Scribed by Simpson, T. H. ;Beton, J. L.
- Book ID
- 111641844
- Publisher
- The Royal Society of Chemistry
- Year
- 1954
- Weight
- 523 KB
- Category
- Article
- ISSN
- 0368-1769
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π SIMILAR VOLUMES
Selective O-demethylation of the ortho methyl catecholate of N,N',N"-tris-(2,3dimethoxybenzeyl)-l,l,l-tris-(L-methioninemehyl)-ethane (2) has been accomplished by boron tribromide. The intramolecular nucleophilic attack of divalent sulphur on methyl enhance this cleavage, favours this selctivity and
## Abstract Selective hydrogenation of ergosterol or its acetate in solution in different solvents over __Raney__ nickel to give 5Ξ±βergostaβ7,22βdienβ3Ξ²βol or its acetate can be controlled by the addition of paraformaldehyde, acetaldehyde, benzaldehyde, 4βdimethylaminobenzaldehyde, and dimethylanil