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87683-09-8

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87683-09-8 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 87683-09-8 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,7,6,8 and 3 respectively; the second part has 2 digits, 0 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 87683-09:
(7*8)+(6*7)+(5*6)+(4*8)+(3*3)+(2*0)+(1*9)=178
178 % 10 = 8
So 87683-09-8 is a valid CAS Registry Number.

87683-09-8Upstream product

87683-09-8Downstream Products

87683-09-8Relevant articles and documents

Stereoselective Hydride Reduction of Tetronic Acid Derivatives. Synthesis of Branched-Chain Tetrofuranoses

Wyss, Heinz,Voegeli, Ulrich,Scheffold, Rolf

, p. 775 - 786 (2007/10/02)

The 3-methoxymethyl derivatives of 2-methyl-D,L-threofuranose (10a) and 2-deoxy-2-methyl-D,L-erythrofuranose (11a) are prepared starting from 2-methyltetronic acid (1).The key step is the stereoselective reduction of the 3-oxo-function of 2-chloro-2-methyl-3-oxo-γ-butyrolacton (2) by sodiumborohydride, which proceeds predominantly anti with respect to the C, Cl-bond.The configuration of the reduction products has been established by 1H- and 13C-NMR.-spectroscopy.

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