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219601-21-5

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219601-21-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 219601-21-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,1,9,6,0 and 1 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 219601-21:
(8*2)+(7*1)+(6*9)+(5*6)+(4*0)+(3*1)+(2*2)+(1*1)=115
115 % 10 = 5
So 219601-21-5 is a valid CAS Registry Number.

219601-21-5Relevant articles and documents

A new method for synthesis of allenes, including an optically active form, from aldehydes and alkenyl aryl sulfoxides by sulfoxide-metal exchange as the key reaction and an application to a total synthesis of male bean weevil sex attractant

Satoh, Tsuyoshi,Hanaki, Noriko,Kuramochi, Yuko,Inoue, Yujiro,Hosoya, Kayo,Sakai, Ken

, p. 2533 - 2549 (2007/10/03)

The sulfoxide-metal exchange reaction of β-acetoxy sulfoxides or β-mesyloxy sulfoxides, which were derived from alkenyl aryl sulfoxides and aldehydes in two steps, with a Grignard reagent or alkyllithium at low temperature gave allenes in good yields. Optically active allenes were synthesized starting from optically active 2-substituted ethenyl p-tolyl sulfoxides. A synthesis of (-)-methyl (E)-2,4,5-tetradecatrienoate, a male bean weevil sex attractant, was realized by this method.

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