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125642-05-9

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125642-05-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 125642-05-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,5,6,4 and 2 respectively; the second part has 2 digits, 0 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 125642-05:
(8*1)+(7*2)+(6*5)+(5*6)+(4*4)+(3*2)+(2*0)+(1*5)=109
109 % 10 = 9
So 125642-05-9 is a valid CAS Registry Number.

125642-05-9Downstream Products

125642-05-9Relevant articles and documents

Reactions between Tantalum- or Niobium-Alkyne Complexes and Carbonyl Compounds

Kataoka, Yasutaka,Miyai, Jiro,Oshima, Koichiro,Takai, Kazuhiko,Utimoto, Kiitiro

, p. 1973 - 1981 (2007/10/02)

A variety of tantalum-alkyne complexes are generated in situ by treatment of alkynes with low-valent tantalum derived from TaCl5 and zinc.These complexes add regioselectively to carbonyl compounds in a one-to-one fashion to yield (E)-allylic alcohols stereoselectively.Iodinolysis of the oxatantalacyclopentene, which is postulated as an intermediate of the reaction, gives a (Z)-3-iodo-2-propen-1-ol derivative.In contrast to tantalum-alkyne complexes, niobium-alkyne complexes, prepared with low-valent niobium derived from NbCl5 and zinc, add in situ to aldehydes in a one-to-two fashion to give 1,3-diene derivatives.The dienes are produced through (i) addition of the alkyne complexes with 2 equiv of aldehydes at cis vicinal positions of the alkenes and (ii) deoxygenative elimination of 2,7-dioxanioba-4-cycloheptene complexes.

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