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20498-05-9

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20498-05-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20498-05-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,4,9 and 8 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 20498-05:
(7*2)+(6*0)+(5*4)+(4*9)+(3*8)+(2*0)+(1*5)=99
99 % 10 = 9
So 20498-05-9 is a valid CAS Registry Number.

20498-05-9Relevant articles and documents

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Hosomi,A. et al.

, p. 977 - 980 (1979)

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1,4-Conjugate addition of allyltrimethylsilane to α,β-unsaturated ketones

Yadav,Reddy,Sadasiv,Satheesh

, p. 9695 - 9697 (2002)

α,β-Unsaturated ketones smoothly undergo conjugate addition with allyltrimethylsilane in the presence of a catalytic amount of elemental iodine under very mild and convenient conditions to afford the corresponding Michael adducts in high yields with high

First synthesis of α,β-unsaturated lactones with high diversity through the Passerini reaction and ring-closing metathesis (RCM)

Schwaeblein, Almuth,Martens, Juergen

experimental part, p. 4335 - 4344 (2011/09/15)

A new class of α,β-unsaturated pyran-2-carboxamides was easily accessed by a multicomponent reaction (MCR), followed by a ring-closing metathesis (RCM) using a ruthenium catalyst. In the first step, α-acyloxy carboxamides with two terminal double bonds were formed from terminal unsaturated carboxylic acids, allyl ketones, and isocyanides (Passerini reaction, P-3CR). A new class of α,β-unsaturated pyran-2-carboxamides was easily accessed by amulticomponent reaction (MCR), followedby a ring-closing metathesis (RCM) using a ruthenium catalyst.

Catalytic enantioselective Hosomi-Sakurai conjugate allylation of cyclic unsaturated ketoesters

Shizuka, Manami,Snapper, Marc L.

supporting information; experimental part, p. 5049 - 5051 (2009/03/11)

(Chemical Equation Presented) No fancy catalyst required: The copper-catalyzed enantioselective conjugate allylation of activated cyclic enones affords products in up to >98% ee. Reactions proceed to high conversion in the presence of commercially availab

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