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40662-68-8

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40662-68-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 40662-68-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 4,0,6,6 and 2 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 40662-68:
(7*4)+(6*0)+(5*6)+(4*6)+(3*2)+(2*6)+(1*8)=108
108 % 10 = 8
So 40662-68-8 is a valid CAS Registry Number.

40662-68-8Relevant articles and documents

Computational and experimental structure-reactivity relationships: evidence for a side reaction in Alpine-Borane reductions of d-benzaldehydes

Zhu, Hui,Soledad Reyes,Meyer, Matthew P.

supporting information; experimental part, p. 6803 - 6806 (2010/04/29)

Extraordinary stereoselectivity, approaching 100%, has been reported in the reductions of d-benzaldehydes by B-isopinocampheyl-9-borabicyclo[3.3.1]nonane (Alpine-Borane). This is likely because of the extreme size disparity of groups on either side of the carbonyl. Here, we present a structure-reactivity study whereby the reductions of variably substituted d-benzaldehydes are explored using highly sensitive measures for enantiomeric excess and relative reactivity. These results are compared to the relative rates predicted from density functional calculations. The results indicate that 2,6-disubstitution adversely affects the stereoselectivity by means of a non-selective reduction via the dehydroboration product of Alpine-Borane, 9-borabicyclo[3.3.1]nonane.

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