Welcome to LookChem.com Sign In|Join Free

CAS

  • or

187158-59-4

Post Buying Request

187158-59-4 Suppliers

Recommended suppliersmore

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

187158-59-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 187158-59-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,8,7,1,5 and 8 respectively; the second part has 2 digits, 5 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 187158-59:
(8*1)+(7*8)+(6*7)+(5*1)+(4*5)+(3*8)+(2*5)+(1*9)=174
174 % 10 = 4
So 187158-59-4 is a valid CAS Registry Number.

187158-59-4Relevant articles and documents

Synthesis and reactions of some ethyl 3(5)aroyl-4-aryl-2-pyrazoline-5(3)carboxylates

Faidallah, Hassan M.,Makki, Mohamed S. I.,El-Massry, Abdel-Moneium I.,Hassan, Saham Y.

, p. 1141 - 1153 (2007/10/03)

A series of ethyl 3(5)aroyl-4-aiyl-2-pyrazoline-5(3)carboxylates 1 was prepared. Their reactions with bromine water, potassium permanganate and potassium hydroxide afforded the corresponding pyrazoles. With aryl and aroyl hydrazines the pyrazolines 1 gave the Schiff bases 9 while with hydrazine hydrate they yielded the corresponding acid hydrazides 11. Condensation of 11 with aromatic aldehydes gave the arylidene derivatives 12, which, on cyclization with the propar reagent, afforded 13 or 14. Reaction of 1 with hydrochloric acid gave the corresponding dipyrazolo-pyrazine derivatives 10.

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 187158-59-4