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25087-79-0

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25087-79-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 25087-79-0 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,0,8 and 7 respectively; the second part has 2 digits, 7 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 25087-79:
(7*2)+(6*5)+(5*0)+(4*8)+(3*7)+(2*7)+(1*9)=120
120 % 10 = 0
So 25087-79-0 is a valid CAS Registry Number.

25087-79-0Relevant articles and documents

Selective Dimerization of Aldehydes to Esters Catalyzed by Hydridoruthenium Complexes

Ito, Takashi,Horino, Hiroshi,Koshiro, Yoshitaka,Yamamoto, Akio

, p. 504 - 512 (1982)

RuH2(PPh3)4 and other hydridoruthenium complexes catalyze selective conversion of aldehydes into esters in high yields.The method is applicable to most aliphatic aldehydes as well as to aromatic aldehydes.The purity of aldehydes is critical for achieving high conversions, since the presence of carboxylic acid completely inhibits the reaction and alcohol and triphenylphosphine reduce the yields of esters.RuH2(PPh3)4 is converted into Ru(CO)3(PPh3)2 through the reaction indicating the occurrence of decarbonylation of aldehyde.A mechanism involving the acyl-H cleavageof aldehyde is proposed to account for the catalysis and formation of compounds accompanying the reaction.The mechanism is compared with an alternative one which comprises of consecutive insertions of two aldehyde molecules into Ru-H bond followed by β-hydrogen abstraction from an alkoxo intermediate formed.Addition of water changes the reaction course togive carboxylato carbonyl complexes Ru(OCOR)2(CO)m(PPh3)2 (m = 1 and 2).Cross esterification studies showed the reactivity order of RCHO as R = Et > Me > n-Pr > i-Pr >> Ph.

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