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1262616-91-0

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1262616-91-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1262616-91-0 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,2,6,2,6,1 and 6 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 1262616-91:
(9*1)+(8*2)+(7*6)+(6*2)+(5*6)+(4*1)+(3*6)+(2*9)+(1*1)=150
150 % 10 = 0
So 1262616-91-0 is a valid CAS Registry Number.

1262616-91-0Relevant articles and documents

Topochemical photodimerization of (E)-3-benzylidene-4-chromanone derivatives from β-type structures directed by halogen groups

Cheng, Xue-Ming,Huang, Zhi-Tang,Zheng, Qi-Yu

experimental part, p. 9093 - 9098 (2011/12/01)

Halogen substituent plays an important role in the crystalline packing of aromatic compounds. The [2+2] photocycloaddition of (E)-3-benzylidene-4- chromanones in the crystalline state was investigated, and halogen substitution has been adopted to organize molecules with proper arrangement for photodimerization. Not halogen bonds, but the electron-withdrawing property of halogen atoms can enhance the face-to-face π-π interactions. Therefore, F, Cl or Br substitution at the para position of phenyl gave rise to almost the same β-structures with face-to-face π-stacking. Only resulted β-structures can undergo photodimerization, which gave the syn-HH (syn-head-to-head) products with high regio-/stereoselectivity.

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