The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature. Computed Properties of C4H12KNaO10, 6381-59-5, Name is Potassium sodium tartrate tetrahydrate, SMILES is O=C([O-])[C@H](O)[C@@H](O)C([O-])=O.[H]O[H].[H]O[H].[H]O[H].[H]O[H].[K+].[Na+], in an article , author is Sun, Jun-Chao, once mentioned of 6381-59-5.
The first highly enantioselective construction of chiral cyclopropa[c]coumarins was described. Using commercially available (bis)cinchona alkaloid (DHQ)(2)PYR as the chiral Lewis base catalyst, together with Cs2CO3 as the achiral base, the reaction of a series of coumarin-3-carboxylate and 3-benzoyl coumarins with tert-butyl 2-bromoacetate could give rise to the corresponding cyclopropa[c]coumarins bearing three continuous chiral stereocenters in 83-93% ee and 90-97% ee, respectively. The reaction is proposed to proceed via an in situ generated ammonium ylide intermediate.
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Reference:
Chiral Catalysts,
,Chiral catalysts – SlideShare