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168211-64-1

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168211-64-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 168211-64-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,8,2,1 and 1 respectively; the second part has 2 digits, 6 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 168211-64:
(8*1)+(7*6)+(6*8)+(5*2)+(4*1)+(3*1)+(2*6)+(1*4)=131
131 % 10 = 1
So 168211-64-1 is a valid CAS Registry Number.

168211-64-1Upstream product

168211-64-1Relevant articles and documents

Catalysis in the Self-Assembly of [2]Rotaxanes and [2]Pseudorotaxanes. Effect of the Length of Polyethereal Side Arms and Terminal Stoppers

D'Acerno, Claudio,Doddi, Giancarlo,Ercolani, Gianfranco,Franconeri, Silvia,Mencarelli, Paolo,Piermattei, Alessio

, p. 1393 - 1396 (2004)

The template effects exerted by compounds 3, 5, 6, and 8 in the ring closure reaction of the trication 13+ to yield the [2] pseudorotaxanes 154+ and 174+ and the [2]rotaxanes 18 4+ and 204+ have been quantitatively evaluated in acetonitrile at 62 °C by UV/vis spectrophotometry. The rate of ring closure of the trication 13+ largely increases in the presence of the templates up to a maximum of ca. 200 times in the case of 5 at a concentration of ca. 0.08 M. The results indicate that, in the self-assembly of a rotaxane, the template effect of the guest is lowered by the presence of two large stoppers (triisopropylsilyl) at the end of the linear chains; this effect is more important the shorter the chain and can be mainly ascribed to steric effects. Previously hypothesized entropic effects appear to be of lesser importance.

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