81658-23-3 Usage
Check Digit Verification of cas no
The CAS Registry Mumber 81658-23-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 8,1,6,5 and 8 respectively; the second part has 2 digits, 2 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 81658-23:
(7*8)+(6*1)+(5*6)+(4*5)+(3*8)+(2*2)+(1*3)=143
143 % 10 = 3
So 81658-23-3 is a valid CAS Registry Number.
81658-23-3Relevant academic research and scientific papers
NEW METHODS AND REAGENTS IN ORGANIC SYNTHESIS. 22. DIPHENYL PHOSPHORAZIDATE AS A REAGENT FOR C-ACYLATION OF METHYL ISOCYANOACETATE WITH CARBOXYLIC ACIDS
Hamada, Yasumasa,Shioiri, Takayuki
, p. 235 - 236 (2007/10/02)
Diphenyl phosphorazidate(DPPA) can be used efficiently for the direct C-acylation of methyl isocyanoacetate with carboxylic acids, giving 4-methoxycarbonyloxazoles.
