Welcome to LookChem.com Sign In|Join Free

CAS

  • or

20247-88-5

Post Buying Request

20247-88-5 Suppliers

Recommended suppliersmore

  • Product
  • FOB Price
  • Min.Order
  • Supply Ability
  • Supplier
  • Contact Supplier

20247-88-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 20247-88-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,0,2,4 and 7 respectively; the second part has 2 digits, 8 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 20247-88:
(7*2)+(6*0)+(5*2)+(4*4)+(3*7)+(2*8)+(1*8)=85
85 % 10 = 5
So 20247-88-5 is a valid CAS Registry Number.

20247-88-5Relevant articles and documents

Syn-1,2-Carboboration of Alkynes with Borenium Cations

Cade, Ian A.,Ingleson, Michael J.

, p. 12874 - 12880 (2014)

The reaction of 8-(trimethylsiloxy)quinoline (QOTMS) with BCl3 and (aryl)BCl2 forms QOBCl2 and QOBCl(aryl). The subsequent addition of stoichiometric AlCl3 follows one of two paths, dependent on the steric demands of the QO ligand and the electrophilicity of the resulting borenium cation. The phenyl- and 5-hexylthienylborenium cations, QOBPh+ and QOBTh+, are formed, whereas QOBCl+ is not. Instead, AlCl3 preferentially binds with QOBCl2 at oxygen, forming QOBCl2AlCl3, rather than abstracting chloride. A modest increase in the steric demands around oxygen, by installing a methyl group at the 7-position of the quinolato ligand, switches the reactivity with AlCl3 back to chloride abstraction, allowing formation of Me2QOBCl+. All the prepared borenium cations are highly chlorophilic and exhibit significant interaction with AlCl4- resulting in an equilibrium concentration of Lewis acidic AlCl3 species. The presence of AlCl3 species limits the alkyne substrates compatible with these borenium systems, with reaction of [QOBPh][AlCl4] with 1-pentyne exclusively yielding the cyclotrimerised product, 1,3,5-tripropylbenzene. In contrast, QOBPh+ and QOBTh+ systems effect the syn-1,2-carboboration of 3-hexyne. DFT calculations at the M06-2X/6-311G(d,p)/PCM(DCM) level confirm that the higher migratory aptitude of Ph versus Me leads to a lower barrier to 1,2-carboboration relative to 1,1-carboboration.

Antiprotozoal quinones. I. Synthesis of 2-hydroxy-3-alkyl-1,4-naphthoquinones as potential coccidiostats.

Bullock

, p. 419 - 424 (2007/10/11)

-

Post a RFQ

Enter 15 to 2000 letters.Word count: 0 letters

Attach files(File Format: Jpeg, Jpg, Gif, Png, PDF, PPT, Zip, Rar,Word or Excel Maximum File Size: 3MB)

1

What can I do for you?
Get Best Price

Get Best Price for 20247-88-5