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917611-93-9

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917611-93-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 917611-93-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 9,1,7,6,1 and 1 respectively; the second part has 2 digits, 9 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 917611-93:
(8*9)+(7*1)+(6*7)+(5*6)+(4*1)+(3*1)+(2*9)+(1*3)=179
179 % 10 = 9
So 917611-93-9 is a valid CAS Registry Number.

917611-93-9Relevant articles and documents

Catalytic diastereoselective polycyclization of homo(polyprenyl)arene analogues bearing terminal siloxyvinyl groups

Uyanik, Muhammet,Ishihara, Kazuaki,Yamamoto, Hisashi

, p. 5649 - 5652 (2007/10/03)

Highly diastereoselective polycyclization of homo(polyprenyl)arene analogues bearing terminal siloxyvinyl groups was catalyzed by tin(IV) chloride (10 mol %). The cyclizations of tert-butyldiphenylsilyl and triisopropylsilyl polyenol ethers gave 4α(equatorial)- and 4β(axial)-siloxypolycycles as major isomers, respectively. The strong nucleophilicity of pro-C(9), a (6E) geometry, and a bulky silyl group effectively favored the 4α-preference, whereas the weak nucleophilicity of pro-C(9), a (6Z)-geometry, and less steric hindrance of a silyl group favored the 4β-preference.

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