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609772-38-5

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609772-38-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 609772-38-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,0,9,7,7 and 2 respectively; the second part has 2 digits, 3 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 609772-38:
(8*6)+(7*0)+(6*9)+(5*7)+(4*7)+(3*2)+(2*3)+(1*8)=185
185 % 10 = 5
So 609772-38-5 is a valid CAS Registry Number.

609772-38-5Downstream Products

609772-38-5Relevant articles and documents

Stereocontrol in hydride addition to ketone-derived chiral N-acylhydrazones

Qin, Jun,Friestad, Gregory K.

, p. 6393 - 6402 (2003)

Chiral N-acylhydrazones derived from various aldehydes and N-amino-4-benzyl-2-oxazolidinone have previously been shown to be effective for acyclic stereocontrol of intermolecular radical and allylsilane additions. Treatment of the propionaldehyde hydrazone with tributyltin hydride in the presence of boron trifluoride etherate led to rapid chemoselective reduction of the imine bond in high yield. Preparation of similar hydrazones from ketones led to E/Z isomer mixtures, usually in ratios of 4:1 or greater. Geometry of the C=N bond was assigned by steric compression shifts in 13C NMR spectra. Reduction with tributyltin hydride and boron trifluoride etherate afforded diastereomer mixtures in ratios very similar to the original E/Z isomer ratios. The chiral auxiliary blocked the opposite face of the C=N bond relative to a related process using a chelated Lewis acid. A stereocontrol model involving monodentate interaction of the N-acylhydrazone and boron trifluoride is consistent with the observed stereochemical outcome.

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