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67171-13-5

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67171-13-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 67171-13-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,7,1,7 and 1 respectively; the second part has 2 digits, 1 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 67171-13:
(7*6)+(6*7)+(5*1)+(4*7)+(3*1)+(2*1)+(1*3)=125
125 % 10 = 5
So 67171-13-5 is a valid CAS Registry Number.

67171-13-5Downstream Products

67171-13-5Relevant articles and documents

Synthesis of aryl-substituted piperidines by superacid activation of piperidones

Klumpp, Douglas A.,Garza, Manuel,Jones, Andre,Mendoza, Saray

, p. 6702 - 6705 (1999)

Diarylpiperidines (8-12) may be prepared in good to excellent yields (80-99%) by the reaction of piperidones (3d-h) with benzene and the Bronsted superacid, trifluoromethanesulfonic acid (CF3-SO3H, TfOH). Tropinone (6) and quinuclidone (7) also react in good yields with benzene in TfOH to give the condensation products (13 and 14). Ketal and acetal derivatives also give condensation products (8 and 24) upon reaction with C6H6 in TfOH. The conversion of 3g to 11 is sensitive to both acid quantity and acid strength; a mechanism is proposed for the conversion that invokes dicationic intermediates.

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