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199807-50-6

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199807-50-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 199807-50-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,8,0 and 7 respectively; the second part has 2 digits, 5 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 199807-50:
(8*1)+(7*9)+(6*9)+(5*8)+(4*0)+(3*7)+(2*5)+(1*0)=196
196 % 10 = 6
So 199807-50-6 is a valid CAS Registry Number.

199807-50-6Relevant articles and documents

The synthesis of bicyclic ortho-quinodimethanes from tricyclic sulfones

Connolly, Terrence J.,Durst, Tony

, p. 15957 - 15968 (2007/10/03)

The first synthesis of bicyclic ortho-quinodimethanes from tricyclic sulfone precursors has been achieved. The required sulfones, 3,4,5,6- tetrahydro-1H-cyclohex[cd]benzothiophene-2,2-dioxide and 1,3,4,5,6,7- hexahydrocyclohept[cd]benzothiophene-2,2-dioxide, were prepared from α- tetralone and benzosuberone utilizing a ring closure proceeding through a sulfonium salt intermediate. The same strategy failed when frying to prepare the tricyclic sulfone of the indane series. Other contrasting reactivity was also noticed when comparing the ability and ease of formation of tricyclic ether compounds. These results indicate that the later ring system is considerably strained.

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