20039-37-6 Usage
Chemical Properties
Orange solid
Uses
Different sources of media describe the Uses of 20039-37-6 differently. You can refer to the following data:
1. Pyridinium dichromate (PDC) is an orange colored solid used as an oxidizing agent.
Oxidizing agent for conversion of primary alcohols to aldehydes and ketones, acetals to esters, and didehydroketones to enones in the presence of tert-butyl hydroperoxide.
Pyridinium Dichromate may be used as an alternative to PCC in nucleoside and carbohydrate oxidation, particularly for fragile molecules. PDC can also be used in conjunction with tertbutylhydroperoxide for a variety of oxidative transformations.
2. Pyridinium dichromate acts as a strong oxidizing agent used in the conversion of primary alcohols and secondary alcohols to aldehydes and ketones respectively. It plays an important role in the oxidation of unsaturated tertiary alcohols, silyl ethers, the carbon-boron bond, and oximes. Further, it is used in the conversion of acetals to esters and didehydroketones to enones in the presence of tert-butyl hydroperoxide.
Definition
ChEBI: Pyridinium dichromate is a pyridinium salt that is the dipyridinium salt of dichromic acid. It is a strong oxidizing agent which can convert primary and secondary alcohols to aldehydes and ketones respectively. It has a role as an oxidising agent. It contains a dichromate(2-).
Preparation
Pyridinium dichromate can be obtained by gradual addition of a solution of chromic anhydride (Cr2O3) in water to pyridine in ice cold conditions.
Flammability and Explosibility
Flammable
Purification Methods
Dissolve it in the minimum volume of H2O and add 5 volumes of cold Me2CO and cool to -20o. After 3hours the orange crystals are collected, washed with a little cold Me2CO and dried in a vacuum. It is soluble in dimethylformamide (0.9g/mL at 25o), and in H2O, and has a characteristic IR with max at 930, 875, 765, 730 and 730 cm-1. [Corey & Schmidt Tetrahedron Lett 399 1979, Coats & Corrigan Chem Ind (London) 1594 1969.] (Possible CARCINOGEN.) § Available commercially on a polymer support.
Check Digit Verification of cas no
The CAS Registry Mumber 20039-37-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,0,3 and 9 respectively; the second part has 2 digits, 3 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 20039-37:
(7*2)+(6*0)+(5*0)+(4*3)+(3*9)+(2*3)+(1*7)=66
66 % 10 = 6
So 20039-37-6 is a valid CAS Registry Number.
InChI:InChI=1/2C5H5N.2Cr.7O/c2*1-2-4-6-5-3-1;;;;;;;;;/h2*1-5H;;;;;;;;;/q;;;;;;;;;2*-1/p+2/r2C5H5N.Cr2O7/c2*1-2-4-6-5-3-1;3-1(4,5)9-2(6,7)8/h2*1-5H;/q;;-2/p+2
20039-37-6Relevant articles and documents
Preparing method for EXP-3174
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Paragraph 0018, (2016/10/09)
The invention discloses a preparing method for EXP-3174. The preparing method is characterized in that losartan is used as a starting raw material and is prepared into EXP-3174 through two-step oxidation. The preparing method has the greatest advantages that a reaction is moderate, the number of side reactions is small, aftertreatment is simple, and EXP-3174 with the purity of 99.9% can be obtained without column chromatography isolation.
