Welcome to LookChem.com Sign In|Join Free

CAS

  • or

133909-68-9

Post Buying Request

133909-68-9 Suppliers

Recommended suppliersmore

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

133909-68-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 133909-68-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,3,3,9,0 and 9 respectively; the second part has 2 digits, 6 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 133909-68:
(8*1)+(7*3)+(6*3)+(5*9)+(4*0)+(3*9)+(2*6)+(1*8)=139
139 % 10 = 9
So 133909-68-9 is a valid CAS Registry Number.

133909-68-9Downstream Products

133909-68-9Relevant articles and documents

Stereochemical Control in Reactions of Nucleophiles with Oxocarbenium Ions Formed by Intramolecular Opening of Activated Epoxides by Neighboring Carbonyl Groups

Fotsch, Christopher H.,Chamberlin, A. Richard

, p. 4141 - 4147 (2007/10/02)

Tandem cyclization/reduction and cyclization/alkylation processes for the stereoselective synthesis of 2,5-disubstituted tetrahydrofurans, 2,6-disubstituted tetrahydropyrans, and 2,7-disubstituted oxepanes are described.In the presence of Lewis acids or TMSOTf, γ,δ-, δ,ε- and ε,ζ-epoxy ketones and esters undergo cyclization to the corresponding oxocarbenium ions, which react in situ with a variety of organosilanes and organoaluminum reagents to give the substituted oxacyclic products.For the synthesis of substituted tetrahydrofurans, the stereochemical control of the addition process was much higher with TMSOTf than BF3*OEt2.

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 133909-68-9