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92639-43-5

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92639-43-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 92639-43-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,2,6,3 and 9 respectively; the second part has 2 digits, 4 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 92639-43:
(7*9)+(6*2)+(5*6)+(4*3)+(3*9)+(2*4)+(1*3)=155
155 % 10 = 5
So 92639-43-5 is a valid CAS Registry Number.

92639-43-5Relevant articles and documents

The Olefin Synthesis from β-Hydroxyalkylphosphonates Induced by Fluorides or Relatively Weak Bases

Kawashima, Takayuki,Ishii, Takafumi,Inamoto, Naoki,Tokitoh, Norihiro,Okazaki, Renji

, p. 209 - 219 (2007/10/03)

β-Hydroxyalkylphosphonates, which were prepared readily from alkylphosphonates and carbonyl compounds, were treated with a fluoride ion such as CsF or with relatively weak bases such as K2CO3 in N,N-dimethylformamide to give the corresponding olefins in good yields. One molar equivalent of water to bases is effective for increasing the yields of olefins. The stereochemistry of erythro-dimethyl (2-hydroxy-1-methyl-2-phenyl)ethylphosphonate was determined by X-ray crystallographic analysis. Use of threo-isomer gave (E)-olefin exclusively, while that of erythro-enricned isomer afforded predominantly (Z)-olefin, indicating that the present olefination proceeds stereospecifically in a manner of syn-elimination.

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