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185155-49-1

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185155-49-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 185155-49-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,5,1,5 and 5 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 185155-49:
(8*1)+(7*8)+(6*5)+(5*1)+(4*5)+(3*5)+(2*4)+(1*9)=151
151 % 10 = 1
So 185155-49-1 is a valid CAS Registry Number.

185155-49-1Relevant articles and documents

Synthesis of (S)- and (R)-3-hydroxyhexadecanoic acid

Jakob, Barbara,Voss, Gundula,Gerlach, Hans

, p. 3255 - 3262 (2007/10/03)

Diol (R)-(+)-3 is prepared either from the hydroxyketone 2 by reduction with fermenting baker's yeast or by hydrolysis of the dioxolane (R)-(+)-1 which is available from dimethyl D-malate as starting material. (R)-(+)-3 could be converted stereoselectively into (R)-(+)-4. Reaction of (+)-4 with dodecylmagnesium bromide yielded the alcohol (S)-(-)-5 with >99% ee. Its acetylation gave (S)-(+)-6 and hydrogenolysis gave the primary alcohol (S)-(+)-7 which could be oxidized selectively to (S)-(+)-8 wih NaIO4/RuCl3. Alkaline hydrolysis of (+)-8 yielded 3-hydroxyhexadecanoic acid (S)-(+)-9 which could be esterified to give the methyl ester (S)-(+)-10 with >99% ee. Starting with the dioxolane (S)-(-)-1, derived from dimethyl L-malate, the 3-hydroxyhexadecanoic acid (R)-(-)-10 could be synthesised via the intemediates (S)-(-)-3, (S)-(-)-4, (R)-(+)-5, (R)-(-)-6, (R)-(-)-7 and (R)-(-)-8. Copyright (C) Elsevier Science Ltd.

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