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138380-27-5

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138380-27-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 138380-27-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,8,3,8 and 0 respectively; the second part has 2 digits, 2 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 138380-27:
(8*1)+(7*3)+(6*8)+(5*3)+(4*8)+(3*0)+(2*2)+(1*7)=135
135 % 10 = 5
So 138380-27-5 is a valid CAS Registry Number.

138380-27-5Relevant articles and documents

Chiral Acylsilanes in Organic Synthesis. Diastereoselective 1,2 Additions to Racemic Alkoxymethyl-Substituted Acylsilanes

Bienz, Stefan,Chapeaurouge, Alexander

, p. 1477 - 1488 (2007/10/02)

The synthesis of the three alkoxymethyl-sustituted acylsilanes 1-3 is described (Schemes 1 and 2).Their reactions with NaBH4 as well as PhLi gave the corresponding alcohols with moderate to good diastereoisomeric induction (up to 78percent de; see Table), depending upon the solvent used (Scheme 3).The results indicate that in Et2O, the reactions with PhLi proceed via 6-membered chelates (see C in Scheme 4) leading to the products with high de's (74 - 78percent).In THF, these chelates are not formed, and as a consequence, the additions take place with reversed and lower stereoselectivities (34 - 50percent de).

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