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90358-31-9

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90358-31-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90358-31-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,3,5 and 8 respectively; the second part has 2 digits, 3 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 90358-31:
(7*9)+(6*0)+(5*3)+(4*5)+(3*8)+(2*3)+(1*1)=129
129 % 10 = 9
So 90358-31-9 is a valid CAS Registry Number.

90358-31-9Relevant articles and documents

Mild and high-yielding synthesis of β-keto esters and β-ketoamides

Sridharan, Vellaisamy,Ruiz, Miriam,Menendez, J. Carlos

experimental part, p. 1053 - 1057 (2010/06/16)

In the presence of sodium acetate, the reaction between 2,2,6-trimethyl-4H-1,3-dioxin-4-one and secondary or tertiary alcohols (including chiral ones) or primary or secondary amines could be carried out in refluxing tetrahydrofuran, under much milder conditions than those described in the literature. In these new conditions, side products normally observed using the traditional protocol were avoided, and-keto esters and-ketoamides were normally obtained in quantitative yields.

Asymmetric synthesis of multifunctionalized pyrrolines by a ruthenium porphyrin-catalyzed three-component coupling reaction

Xu, Hai-Wei,Li, Gong-Yong,Wong, Man-Kin,Che, Chi-Ming

, p. 5349 - 5352 (2007/10/03)

(Chemical Equation Presented) Chiral multifunctionalized pyrrolines have been synthesized by a ruthenium porphyrin catalyzed three-component coupling reaction. In a one-pot reaction, ruthenium porphyrins catalyzed in situ generation of chiral azomethine ylides from chiral diazo esters and imines. Asymmetric 1,3-dipolar cycloaddition reactions of the chiral azomethine ylides with dipolarophiles afforded the corresponding pyrrolines in good yields and high diastereoselectivity (up to 92% de).

Diastereoselective alkylation of 8-phenylmenthyl 2- methylacetoacetate. Preparation of enantiomerically pure 4,4-disubstituted 2-pyrazolin-5-ones

Moreno-Manas, Marcial,Sebastian, Rosa M.,Vallribera, Adelina,Molins, Elies,Espinosa, Enrique

, p. 1525 - 1527 (2007/10/03)

Alkylation of (1R,3R,4S)-8-phenylmenthyl 2-methylacetoacetate with alkyl halides affords 2-alkyl-2-methylacetoacetates in diastereomeric ratios 72:28 to 85:15. The major R (at C-α) diastereoisomers are converted into enantiopure 4,4-disubstituted 2-pyrazolin-5-ones with recovery of the chiral inductor.

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