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226940-89-2

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226940-89-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 226940-89-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,2,6,9,4 and 0 respectively; the second part has 2 digits, 8 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 226940-89:
(8*2)+(7*2)+(6*6)+(5*9)+(4*4)+(3*0)+(2*8)+(1*9)=152
152 % 10 = 2
So 226940-89-2 is a valid CAS Registry Number.

226940-89-2Downstream Products

226940-89-2Relevant articles and documents

Synthesis of 2-Alkoxy-5-methylenetetrahydropyrans: A Regioselective Ruthenium-Catalyzed C-C Coupling Reaction of Prop-2-yn-1-ols with Allyl Alcohol

Derien, Sylvie,Ropartz, Loic,Le Paih, Jacques,Dixneuf, Pierre H.

, p. 3524 - 3531 (2007/10/03)

The carbon-carbon coupling of prop-2-yn-1-ols with allyl alcohol is achieved in the presence of the ruthenium(II) catalyst RuCl(cod)(C5Me5). The coupling reaction is highly regioselective and leads to the HOCR2C(=CH2)CH2CH2CHO isomer and, after cyclization, to either 2-hydroxy- or 2-alkoxy-5-methylenetetrahydropyrans, at room temperature or at 80°C, respectively. It is used for the synthesis of molecules containing two and three tetrahydropyran moieties. The study of a variety of prop-2-yn-1-ols has shown the influence of the substituent at the propargyl carbon on the regioselectivity of the C-C coupling. In the case of tertiary alcohols, the reaction leads to only one cyclic isomer, the 2-alkoxytetrahydropyran whereas with secondary alcohols, a linear isomer is also obtained. The tetrahydropyranols are easily oxidized into lactones.

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