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135503-45-6

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135503-45-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 135503-45-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,5,5,0 and 3 respectively; the second part has 2 digits, 4 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 135503-45:
(8*1)+(7*3)+(6*5)+(5*5)+(4*0)+(3*3)+(2*4)+(1*5)=106
106 % 10 = 6
So 135503-45-6 is a valid CAS Registry Number.

135503-45-6Relevant articles and documents

Efficient Synthesis of (1S,5S)-4-Alkyl-6,6-dimethylbicyclohept-3-en-2-ones from (1R,5S)-(+)-Nopinone and Preparation of Some Chiral Building Blocks Suitable for the Asymmetric Synthesis

Watanabe, Masataka,Awen, Bahlul Z.,Kato, Michiharu

, p. 3923 - 3927 (2007/10/02)

A general and convenient transformation of (1R,5S)-(+)-nopinone (1) into (1S,5S)-4-alkyl-6,6-dimethylbicyclohept-3-en-2-ones, i.e. (-)-verbenone (6a) as the simplest compound and its C(4)-alkyl homologs 6b-f, via (+)-apoverbenone (7) is developed and applied, starting with 6a,e, to the syntheses of (4R,5R)-1-acetoxy-4-isopropenyl-5-methyl-5-vinyl-1-cyclohexene (12a) and (4R,5S)- and (4R,5R)-1-acetoxy-5-(3-butenyl)-4-isopropenyl-5-methyl-1-cyclohexene (12b and 12c), in connection with a search for chiral building blocks suitable for the asymmetric synthesis.Preparation of 12a indicates the formal synthesis of the elemanoid sesquiterpenes (-)-β-elemenone and (-)-eleman-8β,12-olide

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