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81831-55-2

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81831-55-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81831-55-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,8,3 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 81831-55:
(7*8)+(6*1)+(5*8)+(4*3)+(3*1)+(2*5)+(1*5)=132
132 % 10 = 2
So 81831-55-2 is a valid CAS Registry Number.

81831-55-2Downstream Products

81831-55-2Relevant articles and documents

Stereochemistry of 1,4-Addition of Nucleophiles to Ethyl Cyclohexylidenecyanoacetates

Nasipuri, Dhanonjoy,Sarkar, Ashis,Konar, Samir K.

, p. 2840 - 2845 (2007/10/02)

The stereochemistry of 1,4-addition of several nucleophiles such as cyanide, sodium borohydride, and methylmagnesium iodide to three substituted ethyl cyclohexylidenecyanoacetates (1-3) has been determined.A higher preference for equatorial attack is observed in these compounds than in related cyclohexanones, which is considerably diminished by the use of aprotic polar solvents.The results do not show any appreciable contribution of product stability control, recently shown to be important for hydride reduction of cyclohexanones, and have been rationalized on thebasis of a six-center cyclic transition state in which steric factors play a dominant role.These compounds have also been reduced by catalytic hydrogenation (Pd/C), and, interestingly, with unhindered systems (1, 2) hydrogenation takes place more from the axial side (40-60percent) as compared to cyclohexanones.

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