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165876-49-3

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165876-49-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 165876-49-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,5,8,7 and 6 respectively; the second part has 2 digits, 4 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 165876-49:
(8*1)+(7*6)+(6*5)+(5*8)+(4*7)+(3*6)+(2*4)+(1*9)=183
183 % 10 = 3
So 165876-49-3 is a valid CAS Registry Number.

165876-49-3Relevant articles and documents

Stereoselective Additions of Chiral, Functionalized Organozinc Reagents to Achiral and Chiral Aldehydes: a Matched-Mismatched Case in Organozinc Chemistry

Koert, Ulrich,Wagner, Holger,Pidun, Ulrich

, p. 1447 - 1458 (2007/10/02)

The additions of the enantiomerically pure organozinc reagents 17 and 33 to the THF-aldehyde 1 in the presence of the monodentate Lewis acid boron trifluoride-ether give the nonchelation-controlled addition products 7 and 36, respectively (stereoselectivity 95:5, 86:14).These results provide a route to oligo(tetrahydrofuran)s with the relative stereochemistry trans-syn-cis.A stereodirecting effect of the chiral center in the organozinc reagent 17 is found, leading to simple diastereoselectivies in the reaction with achiral aldehydes and to a matched-mismatched case in the reaction with the chiral aldehyde 1. - Key Words: Addition, stereoselective, nonchelation-controlled / Reagent, organozinc / Stereodifferentiation, double / Oligo(tetrahydrofuran)

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