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163923-18-0

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163923-18-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 163923-18-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,3,9,2 and 3 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 163923-18:
(8*1)+(7*6)+(6*3)+(5*9)+(4*2)+(3*3)+(2*1)+(1*8)=140
140 % 10 = 0
So 163923-18-0 is a valid CAS Registry Number.

163923-18-0Downstream Products

163923-18-0Relevant articles and documents

PROCESS FOR THE PREPARATION OF SALMETEROL AND ITS INTERMEDIATES

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, (2012/03/27)

The present invention discloses a process for the preparation of methyl 2-(benzyloxy)- 5-(2-bromoacetyl)benzoate (V), comprising: (d) benzylating methyl-5-acetyl-2-hydroxybenzoate (VIII) with benzyl chloride in the presence of a base and a catalyst in a suitable polar solvent to obtain 5-acetyl-2- benzyloxy benzoate (VII); (e) brominating methyl 5-acetyl-2-(benzyloxy)benzoate (VII) with a suitable brominating agent in one or more suitable' solvents in the presence of an acid catalyst to obtain methyl 2-(benzyloxy)-5-(2-bromoacetyl)benzoate V; (c) optionally, purifying the methyl 2-(benzyloxy)-5-(2-bromoacetyl)benzoate (V) in a suitable solvent; and (f) isolating the methyl 2-(benzyloxy)-5-(2-bromoacetyl)benzoate (V).

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