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1616874-74-8

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1616874-74-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 1616874-74-8 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,1,6,8,7 and 4 respectively; the second part has 2 digits, 7 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 1616874-74:
(9*1)+(8*6)+(7*1)+(6*6)+(5*8)+(4*7)+(3*4)+(2*7)+(1*4)=198
198 % 10 = 8
So 1616874-74-8 is a valid CAS Registry Number.

1616874-74-8Downstream Products

1616874-74-8Relevant articles and documents

Formation of condensed 1 H-pyrrol-2-ylphosphonates and 1,2-dihydropyridin- 2-ylphosphonates via Kabachnik-fields reaction of acetylenic aldehydes and subsequent 5-exo-dig or 6-endo-dig cyclizations

Buk?naitienè, Rita,Urbanaitè, Aurelija,?ikotienè, Inga

, p. 6532 - 6553 (2014/08/05)

Kabachnik-Fields reactions of various carbocyclic or heterocyclic acetylenic aldehydes together with subsequent Lewis acid catalyzed cyclizations have been studied. It was found that 5-exo-dig versus 6-endo-dig cyclization mode strongly depends on the structure of starting materials. Thus, nonaromatic acetylenic α-anilinomethylphosphonates underwent gold(III)-catalyzed or iodine-mediated 5-exo-dig cyclization to 1H-pyrrol-2-ylphosphonates. In contrast, electron-withdrawing heteroaromatic substrates formed 1,2-dihydropyridin-2-ylphosphonate ring containing materials via an exclusive 6-endo-dig ring-closure process. The dual mode of cyclization is possible only for α-amino (2-alkynylphenyl)methylphosphonates containing a benzene ring.

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