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51229-33-5

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51229-33-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 51229-33-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,1,2,2 and 9 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 51229-33:
(7*5)+(6*1)+(5*2)+(4*2)+(3*9)+(2*3)+(1*3)=95
95 % 10 = 5
So 51229-33-5 is a valid CAS Registry Number.

51229-33-5Upstream product

51229-33-5Downstream Products

51229-33-5Relevant articles and documents

Preparation of N-aryl-substituted spiro-β-lactams via staudinger cycloaddition

Barba, Victor,Hernandez, Cecilia,Rojas-Lima, Susana,Farfan, Norberto,Santillan, Rosa

, p. 2025 - 2032 (2007/10/03)

The interest in the study of β-lactams continues due to their therapeutic importance as antibiotics. In this work, six spiro-β-lactams (7a-7c, 8a-8c) have been prepared using the [2+2] cycloaddition of isomaleimides to acid chlorides. The heterobicyclic structures obtained have been characterized by mass spectrometry, IR, NMR spectroscopy, and for compounds 7a, 7b, and 8b the X-ray crystallographic study showed a nearly planar arrangement for the β-lactam ring.

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