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156544-56-8

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156544-56-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 156544-56-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,5,6,5,4 and 4 respectively; the second part has 2 digits, 5 and 6 respectively.
Calculate Digit Verification of CAS Registry Number 156544-56:
(8*1)+(7*5)+(6*6)+(5*5)+(4*4)+(3*4)+(2*5)+(1*6)=148
148 % 10 = 8
So 156544-56-8 is a valid CAS Registry Number.

156544-56-8Relevant articles and documents

P(RNCH2CH2)3N: An Efficient Promoter for the Nitroaldol (Henry) Reaction

Kisanga, Philip B.,Verkade, John G.

, p. 4298 - 4303 (1999)

The use of catalytic amounts of the proazaphosphatranes P(MeNCH2CH2)3N, P(i-PrNCH2CH2)3N and P(HNCH2CH2)(i-PrNCH2CH2) 2N as nonionic bases in the reaction of nitroalkanes with carbonyl compounds is reported. The reaction proceeds at room temperature in the presence of 2.2 equiv of magnesium sulfate to produce the corresponding β-nitroalkanols in generally superior yields. Aldehydes react quantitatively in 5-60 min, whereas ketones require up to 3 h to react with nitromethane and up to 7 h for the reaction of ketones with higher nitroalkanes.

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