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Qu'est-ce (qui) est coumarin$17067$ - définition
Pechmann coumarin synthesis; Simonis chromone cyclization
coumarin
CHEMICAL COMPOUND
Coumarins; Coumarine; Pyranocoumarins; Coumarinoids; Coumarinoid; 1,2-benzopyrone; Chroman ring; Cumarin
['ku:m?r?n]
¦ noun Chemistry a vanilla-scented organic compound found in many plants.
Origin
C19: from Fr. coumarine, from coumarou, via Port. and Sp. from Tupi cumaru 'tonka bean'.
Coumarin
CHEMICAL COMPOUND
Coumarins; Coumarine; Pyranocoumarins; Coumarinoids; Coumarinoid; 1,2-benzopyrone; Chroman ring; Cumarin
·noun The concrete essence of the tonka bean, the fruit of Dipterix (formerly Coumarouna) odorata and consisting essentially of coumarin proper, which is a white crystalline substance, C9H6O2, of vanilla-like odor, regarded as an anhydride of coumaric acid, and used in flavoring. Coumarin in also made artificially.
Warfarin necrosis
MEDICAL CONDITION
Warfarin induced skin necrosis; Anticoagulant-induced skin necrosis; Anticoagulant induced skin necrosis; Coumadin necrosis; Coumarin necrosis
Warfarin-induced skin necrosis is a condition in which skin and subcutaneous tissue necrosis (tissue death) occurs due to acquired protein C deficiency following treatment with anti-vitamin K anticoagulants (4-hydroxycoumarins, such as warfarin).
Wikipédia
Pechmann condensation
The Pechmann condensation is a synthesis of coumarins, starting from a phenol and a carboxylic acid or ester containing a β-carbonyl group. The condensation is performed under acidic conditions. The mechanism involves an esterification/transesterification followed by attack of the activated carbonyl ortho to the oxygen to generate the new ring. The final step is a dehydration, as seen following an aldol condensation. It was discovered by the German chemist Hans von Pechmann .
