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189300-43-4

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189300-43-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 189300-43-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,9,3,0 and 0 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 189300-43:
(8*1)+(7*8)+(6*9)+(5*3)+(4*0)+(3*0)+(2*4)+(1*3)=144
144 % 10 = 4
So 189300-43-4 is a valid CAS Registry Number.

189300-43-4Relevant articles and documents

Use of cyclobutyl derivatives as intermediates in the synthesis of 1,2a,3,8b-tetrahydro-2H-cyclobuta[c]chromenes

Bernard, Angela M.,Floris, Costantino,Frongia, Angelo,Piras, Pier P.,Secci, Francesco

, p. 449 - 457 (2004)

Starting from cyclobutanones and tertiary cyclobutanols several new chromenes containing a cyclobutane ring have been prepared by acid catalyzed intramolecular alkylation of an oxygen-carrying aromatic ring. Interestingly one of the cyclobutanols leads to 3-[(4-methoxyphenoxy)methyl]-2,2,3- trimethylcyclopentanone that is a precursor in the synthesis of the carotenoid pigment capsorubin.

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