2999-20-4 Usage
Preparation
Preparation by Fries rearrangement of resorcinol dipropionate, in the presence of zinc chloride at 130° or at 180° (33%) ; in the presence of aluminium chloride (2 equiv) in nitromethane at r.t. for 2 h (41%) or without solvent at 180° for 30 min (24%) ; in the presence of titanium tetrachloride (2 equiv) in nitromethane at r.t. for 2 h (16%).
Check Digit Verification of cas no
The CAS Registry Mumber 2999-20-4 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,9,9 and 9 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 2999-20:
(6*2)+(5*9)+(4*9)+(3*9)+(2*2)+(1*0)=124
124 % 10 = 4
So 2999-20-4 is a valid CAS Registry Number.
2999-20-4Relevant articles and documents
Synthesis of 2.8-dicyclohexyl-4h, 6h-benzo [1,2-b: 5,4-b′] dipyran-4,6-diones under phase transfer catalysis conditions and their antimicrobial activity
Rajyalakshmi,Shravani,Rajaiah,Rao, A. V. Subha,Ashok
experimental part, p. 381 - 384 (2012/01/04)
An efficient route for the synthesis of 2,8-dicyclohexyl-4H, 6H-benzo [1,2-b: 5,4-b′] dipyran-4,6-diones (2a-f) under phase transfer catalysis conditions (PTC) has been developed by the base catalyzed reaction of substituted resorcinols (1a-f) with cyclohexanoyl chloride in good yields.
