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21961-55-7

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21961-55-7 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 21961-55-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,9,6 and 1 respectively; the second part has 2 digits, 5 and 5 respectively.
Calculate Digit Verification of CAS Registry Number 21961-55:
(7*2)+(6*1)+(5*9)+(4*6)+(3*1)+(2*5)+(1*5)=107
107 % 10 = 7
So 21961-55-7 is a valid CAS Registry Number.

21961-55-7Relevant academic research and scientific papers

Anhydrides from aldehydes or alcohols via oxidative cross-coupling

Gaspa, Silvia,Amura, Ida,Porcheddu, Andrea,De Luca, Lidia

supporting information, p. 931 - 939 (2017/02/10)

A novel type of metal-free oxidative cross-coupling for the synthesis of symmetrical and mixed anhydrides from aldehydes or benzylic alcohols has been developed. The aldehydes or alcohols were converted in situ into their corresponding acyl chlorides, which were then reacted with an array of carboxylic acids. The methodology has a general applicability, and was successfully employed to prepare either aromatic or aliphatic symmetrical anhydrides and mixed anhydrides, which are very unstable compounds.

Iron-doped single-walled carbon nanotubes as new heterogeneous and highly efficient catalyst for acylation of alcohols, phenols, carboxylic acids and amines under solvent-free conditions

Sharghi, Hashem,Jokar, Mahboubeh,Doroodmand, Mohammad Mahdi

experimental part, p. 426 - 442 (2011/04/15)

Iron-doped single-walled carbon nanotubes (Fe/SWCNTs) represent an efficient and new heterogeneous reusable catalyst for the acylation of a variety of alcohols, phenols, carboxylic acids and amines with acid chlorides or acid anhydrides under solvent-free conditions. The reactions of various primary, secondary, tertiary, and benzylic alcohols, diols, phenols, as well as aromatic and aliphatic amines give acylated adducts in good to excellent yields.

Synthesis of anhydrides from acyl halides and zinc carboxylates under aprotic conditions

Pasha,Rizwana

, p. 420 - 421 (2007/10/03)

Synthesis of symmetric as well as unsymmetrical carboxylic acid anhydrides from zinc carboxylates and acid chlorides under aprotic conditions in high yields is reported.

An efficient and simple procedure for preparation of esters and anhydrides from acid chlorides in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) under solvent-free conditions

Hajipour,Mazloumi

, p. 23 - 30 (2007/10/03)

A manipulatively one-pot and rapid method for the synthesis of aliphatic and aromatic ester and anhydride from acid chloride and alcohol or potassium salt of carboxylic acid under solvent-free conditions is reported. The reaction has been carried out in excellent yield and short reaction time in the presence of 1,4-diazabicyclo[2.2.2]octane (DABCO) under solvent-free conditions.

A facile synthesis of acid anhydrides

Dubey,Kumar, R. Vinod

, p. 1 - 3 (2007/10/03)

A facile synthesis of symmetric and unsymmetric acid anhydrides using phase-transfer catalysis is described. By this method different types of anhydrides can be obtained in high yields under mild conditions even on microscale levels.

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