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107538-62-5

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107538-62-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 107538-62-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,7,5,3 and 8 respectively; the second part has 2 digits, 6 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 107538-62:
(8*1)+(7*0)+(6*7)+(5*5)+(4*3)+(3*8)+(2*6)+(1*2)=125
125 % 10 = 5
So 107538-62-5 is a valid CAS Registry Number.

107538-62-5Relevant articles and documents

Regio- and enantioselective synthesis of α-silyl aldehydes and ketones via SAMP/RAMP hydrazones

Enders, Dieter,Lohray, Braj B.,Burkamp, Frank,Bhushan, Vidya,Hett, Robert

, p. 189 - 200 (2007/10/03)

An efficient, highly regio- and enantioselective methodology for the synthesis of α-silyl aldehydes and ketones 2 and 6 using two different procedures was developed. Direct α-silylation of the azaenolates derived from SAMP/RAMP hydrazones 3 with various silyl trifluoromethanesulfonates resulted after oxidative removal of the chiral auxiliary in highly enantiomerically enriched α-silyl aldehydes and ketones (R)- or (S)-2. Alternatively, hydrazones 5 derived from acetaldehyde or methyl ketones were initially α-silylated followed by highly diastereoselective α-alkylation with suitable electrophiles. The latter variant allows the regiocontrolled synthesis of α-silyl ketones (S)-6 with high enantiomeric purity, not available by direct α-silylation of unsymmetrical ketone hydrazones. The absolute configuration of the resultant α-silyl carbonyl compounds 2 and 6 was derived from earlier mechanistic investigations of electrophilic substitutions via deprotonated SAMP/RAMP hydrazones and was unambiguously assigned by X-ray-crystallographical analysis of the α-silyl-SAMP hydrazone (S,R)-4c. VCH Verlagsgesellschaft mbH, 1996.

Enantioselektive Synthese von α-Trialkylsilylketonen und -aldehyden

Enders, Dieter,Lohray, Braj Bhushan

, p. 359 - 360 (2007/10/02)

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