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25091-21-8

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25091-21-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25091-21-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,0,9 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 25091-21:
(7*2)+(6*5)+(5*0)+(4*9)+(3*1)+(2*2)+(1*1)=88
88 % 10 = 8
So 25091-21-8 is a valid CAS Registry Number.

25091-21-8Relevant articles and documents

REDUCTION PAR LES IONS CHROMEUX DE DERIVES BROMOPROPARGYLIQUES EN COMPOSES ALLENIQUES. APPLICATION A LA SYNTHESE DE LA PHEROMONE DE LA BRUCHE DU HARICOT SEC

Doussal, B. Le,Coq, A. Le,Gorgues, A.,Meyer, A.

, p. 2185 - 2192 (1983)

The racemic title compound 2(E) is obtained (77percent) by reduction with chromous ions (THF+HMPT solvent, with anhydrous AcOH) of 7(E) readily prepared from 4 or propargylic diethylacetal as starting materials.In the reduction of 7(E) or 7(Z) with Cr(2+), the nature and ratios of the compounds obtained (2(E), 2(Z), 8(E), 9(E+Z), 10(E)) are strongly dependent on solvent (THF, or THF+HMPT) and on the protonation reagent (H2O or AcOH).These results, and an IR analysis of the organochromium species generated from 7(E) or 7(Z) (A, B and C in equilibrium), suggest two mechanisms of protonolysis of the organochromium intermediates; mainly SE2 (THF+HMPT, anhydrous AcOH) or mainly SEi' (THF, H2O).Some unsuccesful attempts at asymmetric induction in this reaction are reported.

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