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2697-21-4

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2697-21-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2697-21-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,6,9 and 7 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 2697-21:
(6*2)+(5*6)+(4*9)+(3*7)+(2*2)+(1*1)=104
104 % 10 = 4
So 2697-21-4 is a valid CAS Registry Number.

2697-21-4Downstream Products

2697-21-4Relevant articles and documents

Decomposition and Isomerization of Bridgehead Cis 1,2-Diazenes (Azoalkanes)

Chae, Woo-Ki,Baughman, Sharon A.,Engel, Paul S.,Bruch, Manfred,Oezmeral, Cenan,et al.

, p. 4824 - 4833 (1981)

Four acyclic cis 1,2-diazenes, azo-1-adamantane (cis-ada), azo-bicyclooctane (cis-), azo-1-bicycloheptane (cis-), and azo-1-bicyclohexane (cis-) have been generated by UV irradiation of the corresponding trans-isomers.These compounds differ greately in stability, cis- easily surviving at 100 deg C and cis-ada not being isolable.Whereas cis- and cis-only isomerize back to trans on heating, the other two compounds undergo competing loss of nitrogen.The observation that the energy of the transition state for isomerization remains at 42 +/- 1 kcal mol-1 regardless of the cis ground state energy is used to argue that thermal isomerization proceeds via semilinearization rather than rotation.A remarkable correlation of cis ground state energy with cis n,?* excitation energy has emerged from this study.

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