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52251-27-1

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52251-27-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 52251-27-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,2,2,5 and 1 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 52251-27:
(7*5)+(6*2)+(5*2)+(4*5)+(3*1)+(2*2)+(1*7)=91
91 % 10 = 1
So 52251-27-1 is a valid CAS Registry Number.

52251-27-1Relevant articles and documents

Condensation reactions of planar chiral tricarbonyl-chromium-complexed benzylic alcohols and acetates with reactive arenes

Rosca, Sorin I.,Stan, Raluca,Ott, Cristina,Parlea, Elena

, p. 327 - 333 (2011/04/27)

The condensation reaction of planar chiral 2- and 2,5-substituted tricarbonyl-chromium complexed benzylic alcohols and acetates with reactive arenes (durene, anisole, 1,3-dimethoxybenzene, diphenyl ether) is reported. The reactions were performed in both racemic and enantiomeric versions, optically pure and S-(-)-[2-methoxybenzyl alcohol]-tricarbonyl-chromium being prepared by LiAlH4 reduction of diastereomeric, t.l.c. separated, (-)-menthyl esters of [2-methoxybenzoic acis]-tricarbonyl-chromium. The condensation of the difunctional complex [1,4-diacetoxymethylene-2,5-dimethoxybenzene]-tricarbonyl- chromium with an excess of anisole proved the same reactivity at both reactive benzylic sites thus serving as a model for possible polycondensation process. Corresponding optically pure difunctional starting complexes were obtained by t.l.c. separation of diasteromeric diesters with R-(-)-lactic or S-(-)-mandelic acids.

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