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53662-94-5

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53662-94-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 53662-94-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,3,6,6 and 2 respectively; the second part has 2 digits, 9 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 53662-94:
(7*5)+(6*3)+(5*6)+(4*6)+(3*2)+(2*9)+(1*4)=135
135 % 10 = 5
So 53662-94-5 is a valid CAS Registry Number.

53662-94-5Relevant articles and documents

Improved Preparation of Enantiomerically Pure (+)-(4aS,5S)-5-tert-Butoxy-4a-methyl-4,4a,5,6,7,8-hexahydro-2(3H)-naphthalenone

Lutz,Tietze, F.,Utecht, Jens

, p. 957 - 958 (2007/10/02)

(+)-(4aS,5S)-5-tert-Butoxy-4a-methyl-4,4a,5,6,7,8-hexahydro-2(3H)-naphthalenone (6) is a key intermediate in the synthesis of D-homosteroids.Compound 6 was prepared in a five-step sequence via the Wieland-Miescher ketone 4, following the Eder-Sauer-Wiechert-Hajos procedure involving asymmetric intramolecular aldol condensation of the prochiral trione 2 using catalytic amounts of L-proline, with an ee of 63-70percent.Enantiomerically pure 6 was obtained by recrystallization from petroleum ether.

Two-carbon intercalation. 4-cyclooctenones by tandem application of double tebbe and claisen reactions

Philippo, Christophe M. G.,Vo, Nha Hua,Paquette, Leo A.

, p. 2762 - 2764 (2007/10/02)

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