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284043-22-7

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284043-22-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 284043-22-7 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,8,4,0,4 and 3 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 284043-22:
(8*2)+(7*8)+(6*4)+(5*0)+(4*4)+(3*3)+(2*2)+(1*2)=127
127 % 10 = 7
So 284043-22-7 is a valid CAS Registry Number.

284043-22-7Relevant articles and documents

Reactions of RSe-EMe3 (E = Si, Ge, Sn, Pb) with XeF2 - RSe-F equivalents in the fluoroselenenylation of acetylenes

Poleschner, Helmut,Heydenreich, Matthias,Schilde, Uwe

, p. 1307 - 1313 (2007/10/03)

Selenides of the type R1Se-EMe3 (E = Si, Ge, Sn, Pb) react with xenon difluoride by cleavage of the Se-E bond to yield the R1Se-F intermediate and the fluorides Me3E-F, whereas the Se-C bond in PhSe-tBu (E = C) is stable against XeF2. The presence of R1Se-F intermediates is confirmed by addition to acetylenes (4-octyne, 3-hexyne). Thus, the fluoroselenenylation of acetylenes gives fluoro(organylseleno)olefins in preparative yields. In the cases of E = Si, Ge, Sn, and Pb, aryl and n-alkyl groups are suitable as the substituent R1. The X-ray crystal structural analysis of (E)-3-(p- carboxyphenylseleno)-4-fluorohex-3-ene - the first example of an uncharged fluoroselenoolefin synthesized from p-EtO2C-C6H4-Se-SnMe3, XeF2, and 3- hexyne followed by an ester hydrolysis - shows that the addition of the selenenylfluoride intermediate to the acetylene proceeds via a trans- addition, as is known for the R2Se2-XeF2 reagents.

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