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181472-59-3

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181472-59-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 181472-59-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,1,4,7 and 2 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 181472-59:
(8*1)+(7*8)+(6*1)+(5*4)+(4*7)+(3*2)+(2*5)+(1*9)=143
143 % 10 = 3
So 181472-59-3 is a valid CAS Registry Number.

181472-59-3Relevant articles and documents

α-Aminated methyllithium by DTBB-catalysed lithiation of a N- (chloromethyl) carbamate

Ortiz, Javier,Guijarro, Albert,Yus, Miguel

, p. 4831 - 4842 (2007/10/03)

The reaction of O-tert-butyl-N-(chloromethyl)-N-methyl carbamate (1) with lithium powder and a catalytic amount of 4,4'-di-tert-butylbiphenyl (DTBB, 2.5 mol %) in the presence of different electrophiles [Me3SiCl, (i)BuCHO, (t)BuCHO, PhCHO, 4-MeOC6H4CHO, (CH2)4CO, MeCO(n)Pr, Et2CO, MeCO(CH2)2CH=CH2, PhCOMe, PhCO(n)Bu, Ph2CO] in THF at -78°C leads, after hydrolysis with water, to the expected functionalised carbamates 2. Carbamates 2 derived from carbonyl compounds are deprotected with hydrogen chloride (for aromatic aldehyde or ketone derivatives) or with a mixture of phenol and trimethylsilyl chloride (for aliphatic aldehyde derivatives) giving substituted 1,2-diols 4.

α-Nitrogenated organolithium compounds from N-(tosylmethyl)amides

Alonso, Diego A.,Alonso, Emma,Nájera, Carmen,Yus, Miguel

, p. 491 - 492 (2007/10/03)

Deprotonation of α-amido sulfones 7 with BunLi at -90°C followed by reaction with electrophiles leads, depending on the substitution on the amidic nitrogen to enamides 10 (secondary amides 7a,b) or functionalised α-amido sulfones 12 (tertiary amides 7c,d). Naphthalene-catalysed lithiation of tertiary α-amido sulfones 7c,d in the presence of electrophiles (Barbier conditions) at -78°C affords functionalised amides 13.

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