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204842-15-9

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204842-15-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 204842-15-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,4,8,4 and 2 respectively; the second part has 2 digits, 1 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 204842-15:
(8*2)+(7*0)+(6*4)+(5*8)+(4*4)+(3*2)+(2*1)+(1*5)=109
109 % 10 = 9
So 204842-15-9 is a valid CAS Registry Number.

204842-15-9Downstream Products

204842-15-9Relevant articles and documents

Chemoselectivity in the rhodium-catalyzed hydroformylation of 4-vinylpyridine: Crucial role of phosphine ligand in promoting carbonylation instead of hydrogenation

Caiazzo, Aldo,Settambolo, Roberta,Pontorno, Lorenzo,Lazzaroni, Raffaello

, p. 298 - 303 (2000)

Hydroformylation of 4-vinylpyridine (4VP) in benzene with Rh4(CO)12/PMe2Ph or Rh4CO12 as catalytic precursor shows completely different chemoselectivity, carbonylation product (branched aldehyde) largely prevailing with the first catalyst, hydrogenation product 4-ethylpyridine (4EP) with the second one. Different phosphines and P/Rh ratios were also used, and a comparison with 3-vinylpyridine (3VP) under the same experimental conditions was made too. In all the experiments 3VP exclusively gives aldehidic products. In the case of 4VP, hydrogenation prevails on carbonylation at low P/Rh ratio (0.5), while for higher values more than 80% of carbonylation product is obtained. The strong electron-donor phosphine ligand changes the polarization of the carbon-rhodium bond making this carbon suitable for the migratory insertion process and hence determining the acyl-metal intermediate formation precursor of the aldehyde.

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