Fonctionnalisations régio et stéréospécifiques successives en méta et en ortho des η6-arènetricarbonylchrome
✍ Scribed by Jacques Brocard; Sophie Goetgheluck; Lydie Pelinski
- Book ID
- 103228121
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 228 KB
- Volume
- 476
- Category
- Article
- ISSN
- 0022-328X
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Couplage mixte entre sulfones vinyliques et rdactifs de Grignard en presence de sels de metal de transition : synthese stereoselective d'olefines trisubstituees.
The methylene-de-oxo-bisubstitution reaction between dimethyl isopropylidene malonate and the C-15 b-methylenealdehyde 1 which could serve as substitute for E b-ionylideneacetaldehyde 2, produces stereoselectively the E,E olefin. Hence, new stereoselective syntheses of 13 E and 13 Z retinoic acids w
## Abstract The synthesis of branched‐chain sugars of the __gem__‐hydroxy‐formyl and the __gem__‐hydroxy‐hydroxymethyl types is described. A 5‐deoxy‐1,2‐O‐isopropylidene‐furanos‐3‐ulose is treated with cyanomethylene‐triphenyl‐phosphorane, yielding the two geometrical isomers of the corresponding b