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133545-90-1

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133545-90-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133545-90-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,5,4 and 5 respectively; the second part has 2 digits, 9 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 133545-90:
(8*1)+(7*3)+(6*3)+(5*5)+(4*4)+(3*5)+(2*9)+(1*0)=121
121 % 10 = 1
So 133545-90-1 is a valid CAS Registry Number.

133545-90-1Relevant articles and documents

Use of carbonallation of allenes in the synthsis of polycyclic compound. A rapid access to steroid skeletons

Gauthier, Veronique,Gazes, Bernard,Gore, Jacques

, p. 563 - 579 (2007/10/03)

The carbonallation of allenes in the presence of a 1,3-cycloalkanedione enolete leads, in certain cases with good yields, to 2-substituted 1,3-cycloalkanediones with an unsaturated chain with a 1,3-butadienyl moiety (compounds 1). Under acidic conditions, these compounds can be readily cyclized with the formation of a cyclohexane ring if the substituents of the butadienyl framework exert sufficient stabilization on the electrodeficient carbon of the transition state. This methodology leads in a two-step sequence to steroids with an aromatic A-ring. Elsevier,.

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