lettre expresse - significado y definición. Qué es lettre expresse
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Qué (quién) es lettre expresse - definición

Westphalen-Lettre rearrangement; Westphalen-Lettré rearrangement; Westphalen–Lettre rearrangement

Lettre à M. Dacier         
  • hieroglyphic]] phonetic characters that appears as an illustration in the ''Lettre à M. Dacier''
BOOK BY JEAN-FRANÇOIS CHAMPOLLION
Lettre a M. Dacier
(full title: : "Letter to M. Dacier concerning the alphabet of the phonetic hieroglyphs") is a letter sent in 1822 by the Egyptologist Jean-François Champollion to Bon-Joseph Dacier, secretary of the French Académie des Inscriptions et Belles-Lettres.
Westphalen–Lettré rearrangement         
The Westphalen–Lettré rearrangement is a classic organic reaction in organic chemistry describing a rearrangement reaction of cholestane-3β,5α,6β-triol diacetate with acetic anhydride and sulfuric acid. In this reaction one equivalent of water is lost, a double bond is formed at C10–C11 and importantly the methyl group at the C10 position migrates to the C5 position.
Lettres de cachet         
ORDERS OF THE KING OF FRANCE, OFTEN ARREST WARRANTS
Lettre de Cachet; Lettres de Cachet; Letter de cachet; Lettre de cachet
Lettres de cachet (; ) were letters signed by the king of France, countersigned by one of his ministers, and closed with the royal seal. They contained orders directly from the king, often to enforce arbitrary actions and judgments that could not be appealed.

Wikipedia

Westphalen–Lettré rearrangement

The Westphalen–Lettré rearrangement is a classic organic reaction in organic chemistry describing a rearrangement reaction of cholestane-3β,5α,6β-triol diacetate with acetic anhydride and sulfuric acid. In this reaction one equivalent of water is lost, a double bond is formed at C10–C11 and importantly the methyl group at the C10 position migrates to the C5 position.

The reaction is first-order in steroid in the presence of an excess of sulfuric acid and the first reaction step in the reaction mechanism is likely the formation of a sulfate ester followed by that of a carbocation at C5 after which the actual rearrangement takes place.