Cas 77516-23-5,C<sub>33</sub>H<sub>28</sub>

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Check Digit Verification of cas no

The CAS Registry Mumber 77516-23-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,7,5,1 and 6 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 77516-23:
(7*7)+(6*7)+(5*5)+(4*1)+(3*6)+(2*2)+(1*3)=145
145 % 10 = 5
So 77516-23-5 is a valid CAS Registry Number.

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77516-23-5Relevant academic research and scientific papers

EVIDENCE AGAINST THE (?2s + ?2a) MECHANISM FOR THE CYCLOADDITIONS OF ALLENES (1)

Pasto, Daniel J.

, p. 4787 - 4790 (1980)

The chemoselectivities in the (?"s + ?2a) cycloaddition reactions of tetraphenylcyclopentadienone (TPCD) with ethyl- and 1,1-dimethylallene have been determined and are compared with those observed for reaction with maleic anhydride.

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