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78037-12-4

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78037-12-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 78037-12-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,0,3 and 7 respectively; the second part has 2 digits, 1 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 78037-12:
(7*7)+(6*8)+(5*0)+(4*3)+(3*7)+(2*1)+(1*2)=134
134 % 10 = 4
So 78037-12-4 is a valid CAS Registry Number.

78037-12-4Relevant articles and documents

The new convenient synthesis of novel γ-alkylidenebutenolides from 6-aminopenicillanic acid

Yu, Bin,Zhang, En,Fang, Yuan,Sun, Xiao-Nan,Ren, Jing-Li,Yu, De-Quan,Liu, Hong-Min

, p. 163 - 176 (2013/03/13)

Butenolides have good biological activity and serve as the important unit of pharmaceutical intermediates, of which γ-alkylidenebutenolides have gained wide attention over the last past decades particularly. A simple and practical method for the synthesis of butenolide 6 and its 5-substituted analogues 7a-t via vinylogous aldol reaction from 6-aminopenicillanic acid (6-APA) with the ratio of Z/E isomers between 1.1/1.0 and 1.0/0 under mild conditions in 6 steps was first reported. Besides, we also reported the methanolysis behaviors of azetidinone fused oxazoline derivatives. All the synthesized γ-alkylidenebutenolides are new and are currently being evaluated for their biological activities.

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