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90843-22-4

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90843-22-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 90843-22-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,0,8,4 and 3 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 90843-22:
(7*9)+(6*0)+(5*8)+(4*4)+(3*3)+(2*2)+(1*2)=134
134 % 10 = 4
So 90843-22-4 is a valid CAS Registry Number.

90843-22-4Relevant articles and documents

Palladium-catalyzed: Ortho -halogen-induced deoxygenative approach of alkyl aryl ketones to 2-vinylbenzoic acids

Ram, Shankar,Sharma, Ajay Kumar,Chauhan, Arvind Singh,Das, Pralay

, p. 10674 - 10677 (2020/10/02)

The 2-vinylbenzoic acids have wide applications in the field of polymer chemistry and are key precursors for the synthesis of important bioactive molecules. Herein, an ortho-halogen-induced deoxygenative approach for the generation of 2-vinylbenzoic acids from alkyl aryl ketones by palladium catalysis is discovered and explored. This approach requires no base or stoichiometric additives and can be carried out through a simple one-step process. Furthermore, the present reaction is scalable up to one-gram scale. The commercially available palladium on carbon (5 wt%) was used as a heterogeneous catalyst and showed excellent recyclability (5 times) without significant loss in catalytic activity. Pleasingly, under our optimized conditions, the alpha alkyl substituted 2-iodoacetophenones exhibit good diastereoselectivity and predominantly (E)-2-vinylbenzoic acids were obtained with good to excellent yields.

Copper-Catalyzed Amino Lactonization and Amino Oxygenation of Alkenes Using O-Benzoylhydroxylamines

Hemric, Brett N.,Shen, Kun,Wang, Qiu

supporting information, p. 5813 - 5816 (2016/06/09)

A copper-catalyzed amino lactonization of unsaturated carboxylic acids has been achieved as well as the analogous intermolecular three-component amino oxygenation of olefins. The transformation features mild conditions and a remarkably broad substrate sco

C3-symmetric cinchonine-squaramide-catalyzed asymmetric chlorolactonization of styrene-type carboxylic acids with 1,3-dichloro-5,5- dimethylhydantoin: An efficient method to chiral isochroman-1-ones

Han, Xin,Dong, Chune,Zhou, Hai-Bing

supporting information, p. 1275 - 1280 (2014/05/06)

A more practical and efficient catalytic asymmetric chlorolactonization of styrene-type carboxylic acids with 1,3-dichloro-5,5-dimethylhydantoin (DCDMH) using C3-symmetric cinchonine-squaramide (CSCS) as organocatalyst has been developed. A series of chiral chloro-substituted isochroman-1-ones was obtained in excellent yields (up to 95%) and enantioselectivities (up to 99% ee), whwereby the results for chloro-substituted isochroman-1-ones are the best ever achieved. The catalyst can be recovered and reused for six cycles. Moreover, the chlorolactonization product 3b was further transformed to optically active bicyclic isochroman-1-one derivatives in high yield without losing the enantioselectivity. Furthermore, compounds 3e and 2n proved to be highly potent inhibitors of the HIV-1 in TZM-bl cells.

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