Welcome to LookChem.com Sign In|Join Free

CAS

  • or

81794-91-4

Post Buying Request

81794-91-4 Suppliers

Recommended suppliersmore

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

81794-91-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 81794-91-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,7,9 and 4 respectively; the second part has 2 digits, 9 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 81794-91:
(7*8)+(6*1)+(5*7)+(4*9)+(3*4)+(2*9)+(1*1)=164
164 % 10 = 4
So 81794-91-4 is a valid CAS Registry Number.

81794-91-4Downstream Products

81794-91-4Relevant articles and documents

Captodative Substitution and Cyclopropane Geometry. Part 5. X-Ray Structure of Five New Compounds and Asymmetry Parameters of the Substituents

Tinant, Bernard,Wu, Shan,Declercq, Jean-Paul,Meerssche, Maurice Van,Masamba, Wayiza,et al.

, p. 1045 - 1052 (2007/10/02)

Five new captodative (cd) substituted cyclopropanes have been synthesized and their structures determined from X-ray diffraction data.These are cis-1,2-dicyano-1,2-dimethyl- (1), trans-1,2-dicyano-1,2-bisethoxycarbonyl- (2), cis-1,2-dicyano-1,2-dimethoxy- (3), trans-1,2-dicyano-1,2-bismethylthio- (4), and trans-1,2-dicyano-1,2-bis(dimethylamino)-cyclopropane (5).These structures have been solved by direct methods and refined by least-squares using 865, 1332, 766, 1075, and 1341 reflections respectively, to R 0.062, 0.041, 0.044, 0.031, and 0.049.This work completes former results and permits the discussion of the influence of polar substituents on cyclopropane geometry in relation to their reported ease of cis-trans isomerization.The effect on ring bond lengths is small but significant: in both captodative and dicapto-substitution, the distal ring bond is shortened and vicinal bonds are lengthened.Mean distal-bond shortenings are proposed for SR, OR, and NR2; the values calculated for CN, C=O, and phenyl agree with published data.The particular facile isomerization of cd cyclopropanes appears best explained, not as the consequence of a destabilized ground state but but rather as increased spin delocalization in the transition state.

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 81794-91-4