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128649-19-4

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128649-19-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128649-19-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,6,4 and 9 respectively; the second part has 2 digits, 1 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 128649-19:
(8*1)+(7*2)+(6*8)+(5*6)+(4*4)+(3*9)+(2*1)+(1*9)=154
154 % 10 = 4
So 128649-19-4 is a valid CAS Registry Number.

128649-19-4Relevant articles and documents

REGIOSPECIFIC RING CLEAVAGE OF α,β-EPOXYSILANES TO FORM TRANSITION METAL ENOLATE INTERMEDIATES

Hirao, Toshikazu,Fujihara, Yoshimi,Tsuno, Shingo,Ohshiro, Yoshiki,Agawa, Toshio

, p. 367 - 368 (1984)

Molybdenum(II) acetate dimer or titanium(IV) i-propoxide induced regiospecific ring cleavage of α,β-epoxysilanes to form the enolate intermediates, which reacted with aldehydes to give the corresponding α,β-unsaturated carbonyl compounds.

OXIDATION OF ALDEHYDES TO α,β-UNSATURATED ALDEHYDES VIA α-CHLOROALDIMINES

Kimpe, Norbert De,Stevens, Christian

, p. 41 - 46 (2007/10/02)

The oxidation of aldehydes to α,β-unsaturated aldehydes has been performed by a sequence of reactions involving conversion into aldimines, chlorination at the α-position to form α-chloroaldimines, base-induced dehydrochlorination and hydrolysis.The four-step transformation can be executed without isolation of the intermediates.This method has been applied to the synthesis of an artificial flavor, i.e. 2-butyl-3-phenylpropenal.

REACTION OF ENOLATES OF ACYLTRIMETHYLSILANES WITH ALDEHYDES. CANNIZZARO TYPE OXIDATION-REDUCTION REACTION WITH A TRIMETHYLSILYLCARBONYL GROUP

Kuwajima, Isao,Matsumoto, Kazuhisa,Sugahara, Shuichi

, p. 525 - 528 (2007/10/02)

The reaction of an acyltrimethylsilane enolate with 2 eq of an aldehyde gives a 1:2 adduct, while that with the enolate of an α-chloroacyltrimethylsilane affords an α,β-unsaturated aldehyde as a 1:1 adduct accompanied by the carboxylic acid derived from the starting aldehyde.An oxidation-reduction reaction mechanism on the trimethylsilylcarbonyl group has been proposed.

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