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131236-52-7

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131236-52-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 131236-52-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,1,2,3 and 6 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 131236-52:
(8*1)+(7*3)+(6*1)+(5*2)+(4*3)+(3*6)+(2*5)+(1*2)=87
87 % 10 = 7
So 131236-52-7 is a valid CAS Registry Number.

131236-52-7Downstream Products

131236-52-7Relevant articles and documents

Dianions of 1,4-Bis(methylene)cyclohexane. Conformational Effects in Cyclic and Acyclic Dilithiated Hydrocarbons

Meyer, Stephanie D.,Mills, Nancy S.,Runnels, Joy B.,Torre, Barbara de la,Ruud, C. Channing,Johnson, David K.

, p. 947 - 952 (2007/10/02)

Dimetalation of 1,4-bis(methylene)cyclohexane results in formation of the p-xylene dianion via the linearly conjugated dianion 4.In contrast, 2-methyl-1,5-hexadiene, an acyclic analogue of 1,4-bis(methylene)cyclohexane, undergoes isomerization via the linearly conjugated dianion 12, rather than hydride elimination.MNDO calculations of the conformation of dilithiated 4 and 12 show that 4 is effectively planar, with a symmetrical distribution of charge.Dilithiated 12 is nonplanar, with an almost right angle bend in the ?-system.The dianion can therefore be considered as two allyl anions which are orthogonal to each other.The difference in calculated conformations of 4 and 12 is advanced as the reason for the different reactivity of the two systems.

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