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74176-91-3

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74176-91-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 74176-91-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,4,1,7 and 6 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 74176-91:
(7*7)+(6*4)+(5*1)+(4*7)+(3*6)+(2*9)+(1*1)=143
143 % 10 = 3
So 74176-91-3 is a valid CAS Registry Number.

74176-91-3Relevant articles and documents

Process for preparing 9,11-unsaturated steroidal compound from the corresponding saturated steroidal compound

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, (2008/06/13)

The present invention provides a non-fermentation process for placing unsaturation at the 9,11 position in a steroidal compound. Also, the present invention provides a process whereby the modified steroidal compound can be separated from the reaction mixture without the use of chromatography. More specifically, the present invention provides a process whereby a steroid compound such as 17-α-hydroxy-progesterone is reacted to form the meta iodoaryl benzoate. The iodoarylbenzoate is then irradiated with visible light in the presence of an alkyl-m-iodobenzoate dichloride to form the 9α-chloro steroid derivative. The chlorinated steroid derivative can then be hydrolized to provide a 9α-chloro steroidal alcohol and m-iodobenzoic acid. The m-iodobenzoic acid is extracted by the use of an aqueous base. The chlorinated steroidal alcohol can then be recovered and converted by conventional dehalogenation techniques to steroidal unsaturated compound having a double bond in the 9,11 position of the steroid nucleus. Alternatively, the chlorinated steroid derivative can be dehalogenation and then hydrolized.

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