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142819-91-8

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142819-91-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 142819-91-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,4,2,8,1 and 9 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 142819-91:
(8*1)+(7*4)+(6*2)+(5*8)+(4*1)+(3*9)+(2*9)+(1*1)=138
138 % 10 = 8
So 142819-91-8 is a valid CAS Registry Number.

142819-91-8Relevant articles and documents

Chemoselectivity and stereoselectivity of cyclisation of α-diazocarbonyls leading to oxygen and sulfur heterocycles catalysed by chiral rhodium copper catalysts

Ye, Tao,Garcia, Concepcion Fernandez,McKervey, M. Anthony

, p. 1373 - 1380 (2007/10/02)

Good levels of enantioselectivity have been achieved in intramiolecular C-H insertion reactions of α-diazocarbonyl compounds leading to six-membered oxygen heterocycles (chromanones) through the use of chiral rhodium(II) carboxylates as catalysts.Competition between C-H insertion and sigmatropic rearrangement, the latter leading to five-membered oxygen heterocycles (furanones), was observed with precursors containing a proximal O-allyl side chain.Whereas rhodium carboxylates produced C-H insertion products predominantly, a copper catalyst produced sigmatropic rearrangement products exclusively.A precursor with S-allyl side chain exhibited cyclisation via sigmatropic rearrangement with both copper and rhodium catalyst.

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