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209391-60-6

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209391-60-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 209391-60-6 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,9,3,9 and 1 respectively; the second part has 2 digits, 6 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 209391-60:
(8*2)+(7*0)+(6*9)+(5*3)+(4*9)+(3*1)+(2*6)+(1*0)=136
136 % 10 = 6
So 209391-60-6 is a valid CAS Registry Number.

209391-60-6Relevant articles and documents

Fritsch-Buttenberg-Wiechell rearrangement of magnesium alkylidene carbenoids leading to the formation of alkynes

Ando, Akane,Imafuji, Aki,Kimura, Tsutomu,Sekiguchi, Koto

, p. 1352 - 1359 (2021/06/06)

A series of 1-heteroatom-substituted vinyl p-tolyl sulfoxides were prepared and treated with organometallic reagents to evaluate which combination of sulfoxides and organometallic reagents yielded alkynes the most efficiently. The use of 1-chlorovinyl p-tolyl sulfoxide and isopropylmagnesium chloride was optimal for this purpose. A variety of 1-chlorovinyl p-tolyl sulfoxides were prepared from carbonyl compounds and chloromethyl p-tolyl sulfoxide and were converted into alkynes via the sulfoxide/magnesium exchange reaction and subsequent Fritsch-Buttenberg-Wiechell (FBW) rearrangement of the resulting magnesium alkylidene carbenoids. The mechanism of the FBW rearrangement of magnesium alkylidene carbenoids was studied by using13C-labeled sulfoxides and by using DFT calculations.

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