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1533-89-7

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1533-89-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1533-89-7 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 1,5,3 and 3 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 1533-89:
(6*1)+(5*5)+(4*3)+(3*3)+(2*8)+(1*9)=77
77 % 10 = 7
So 1533-89-7 is a valid CAS Registry Number.

1533-89-7Relevant articles and documents

Ring-opening of Some Radicals containing the Cyclopropylmethyl System

Beckwith, Athelstan L. J.,Moad, Graeme

, p. 1473 - 1482 (2007/10/02)

Mono- and bi-cyclic radicals containing the cyclopropylmethyl system are readily generated by interaction of the appropriate halides with triphenyl- or tributyl-stannane.Each radical studied underwent ring-opening by fission of the more substituted βγ-bond.In the case of the secondary radical (12b) the new double bond was formed preferentially in the trans-configuration.Rate constants, which cannot be determined with high accuracy by this method, lie in the range 1E7-3E8 s-1 at 25 deg C.When generated by the flow method in the e.s.r. cavity α-hydroxycyclopropylmethyl radicals undergo β-fission followed by 1,5-hydrogen atom t ransfer to afford enoxyl radicals.The latter reaction occurs more slowly in water than in non-polar solvents.The rigid hydroxynortricyclyl (43) undergoes preferential fission of the less substituted βγ-bond, possibly because of the dipolar nature of the transition state.

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