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99512-42-2

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99512-42-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 99512-42-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,9,5,1 and 2 respectively; the second part has 2 digits, 4 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 99512-42:
(7*9)+(6*9)+(5*5)+(4*1)+(3*2)+(2*4)+(1*2)=162
162 % 10 = 2
So 99512-42-2 is a valid CAS Registry Number.

99512-42-2Relevant articles and documents

DBU-Catalyzed Ring-Opening and Retro-Claisen Fragmentation of Dihydropyranones

Axelsson, Anton,Hammarvid, Emmelie,Rahm, Martin,Sundén, Henrik

, p. 5436 - 5444 (2020/08/26)

We present a general protocol for the formal Michael addition of acetone to α,β-unsaturated esters and amides, a transformation difficult to perform using current methods. The protocol comprises of an amidine catalyzed relay ring-opening and fragmentation

Highly regioselective addition of an ester enolate equivalent to α,β-unsaturated ketones: Selective formation of both isomers derived from 1,2- and 1,4-additions using α-stannyl ester with additives

Yasuda,Matsukawa,Okamoto,Sako,Kitahara,Baba

, p. 2149 - 2150 (2007/10/03)

The reaction of α-stannyl ester with α,β-unsaturated ketones in the presence of stannous chloride (SnCl2) and chlorosilanes (Me3SiCl or Me2SiCl2) gave 1,2- and 1,4-addition products, respectively.

3-Substituted-γ-butyrolactones from 5-Trimethylsilyl-2-cyclohexenone. Synthesis of (-)-Enterolactone

Asaoka, Morio,Fujii, Naoaki,Shima, Kunihisa,Takei, Hisashi

, p. 805 - 808 (2007/10/02)

1,4-Adducts of 5-trimethylsilyl-2-cyclohexenone (1) with Grignard reagents were converted to various hexanoate derivatives and γ-butyrolactones.Starting from optically pure 1, (-)-enterolactone (Factor X) was synthesized.

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