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15649-56-6

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15649-56-6 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 15649-56-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 1,5,6,4 and 9 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 15649-56:
(7*1)+(6*5)+(5*6)+(4*4)+(3*9)+(2*5)+(1*6)=126
126 % 10 = 6
So 15649-56-6 is a valid CAS Registry Number.

15649-56-6Relevant articles and documents

Method for preparing dimethyl 3-methylpentyl-2-enedionate

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Paragraph 0027; 0030-0032, (2018/07/30)

The invention provides a method for preparing dimethyl 3-methylpentyl-2-enedionate. The method has the advantages of easy availability of raw materials, high yield and less waste residues, and is suitable for industrial production.

Allosteric effects in binuclear homo- and heterometallic triple-stranded lanthanide podates

Ryan, Patrick E.,Canard, Gabriel,Koeller, Sylvain,Bocquet, Bernard,Piguet, Claude

, p. 10012 - 10024 (2012/10/30)

This work illustrates a simple approach for deciphering and exploiting the various free energy contributions to the global complexation process leading to the binuclear triple-stranded podates [Ln2(L9)]6+ (Ln is a trivalent lanthanide). Despite the larger microscopic affinities exhibited by the binding sites for small Ln3+, the stability constants measured for [Ln2(L9)]6+ decrease along the lanthanide series; a phenomenon which can be ascribed to the severe enthalpic penalty accompanying the intramolecular cyclization around small Ln(III), combined with increasing anticooperative allosteric interligand interactions. Altogether, the microscopic thermodynamic characteristics predict β1,1,1 La,Lu,L9/β1,1,1Lu,La,L9 = 145 for the ratio of the formation constants of the target heterobimetallic [LaLu(L9)] 6+ and [LuLa(L9)]6+ microspecies, a value in line with the quantitative preparation (>90%) of [LaLu(L9)]6+ at millimolar concentrations. Preliminary NMR titrations indeed confirm the rare thermodynamic programming of a pure heterometallic f-f′ complex.

A Stereospecific Synthesis of (+/-)-Abscisic Acid

Cornforth, John,Hawes, John E.,Mallaby, Richard

, p. 179 - 185 (2007/10/02)

A convenient separation of (E)- and (Z)-3-methylpent-2-enedioic acids was devised, and it was shown that with acetyl chloride or thionyl chloride the (Z)-acid yields the cyclic anhydride while the (E)-acid forms 6-chloro-4-methylpyran-2-one.The chloropyranone by conventional chemistry gave 4-methyl-6-(2'-oxopropyl)pyran-2-one which condensed with 4-methylpent-3-en-2-one in the presence of pyrrolidine, yielding 4-methyl-6-(2',6',6'-trimethyl-4'-oxocyclohex-2'-enyl)pyran-2-one.Oxidation with selenium dioxide or t-butyl chromate then gave 6-(1'-hydroxy-2',6',6'-trimethyl-4'-oxocyclohex-2'-enyl)-4-methylpyran-2-one, which on reduction by lithium aluminium hydride and reoxidation afforded (+/-)-abscisic acid stereospecifically.

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