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129708-04-9

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129708-04-9 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 129708-04-9 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,9,7,0 and 8 respectively; the second part has 2 digits, 0 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 129708-04:
(8*1)+(7*2)+(6*9)+(5*7)+(4*0)+(3*8)+(2*0)+(1*4)=139
139 % 10 = 9
So 129708-04-9 is a valid CAS Registry Number.

129708-04-9Relevant articles and documents

Synthesis of Isoquinoline Derivatives by a Tandem Aza-Wittig/Electrocyclization Strategy and Preparation of the Unknown 1,9-Diazaphenalene Ring by a Consecutive Electrocyclic Ring Closure/Claisen Rearrangement/Intramolecular Amination Process

Molina, Pedro,Alajarin, Mateo,Vidal, Angel

, p. 6140 - 6147 (2007/10/02)

Treatment of iminophosphorane 3, derived from ethyl α-azido-2-(allyloxy)cinnamate, with aromatic isocyanates in toluene at 150 deg C leads to the corresponding isoquinoline derivatives 5 by a tandem electrocyclic ring closure/Claisen rearrangement of the intermediate carbodiimide.Fremy's salt promoted oxidation of compounds 5 yields the 5,8-isoquinolinequinone allides 6, which by heating undergo cyclization to 2H-pyranoisoquinolines 7.Iminophosphorane 14, derived from ethyl α-azido-2-(allyloxy)-3-methoxycinnamate, reacts with aromatic isocyanates to give thecorresponding carbodiimides, which by thermal treatment at 150 deg C undergo a consecutive electrocyclic ring closure/Claisen rearrangement/intramolecular amination process to give 1,9-diazaphenalene derivatives 18 in moderate yields.

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