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2,2-Dimethyl-propionic acid (2S,3S,4R,5R,7R)-7-[(2S,3S,5S,7R,8S,9S)-7-(2-benzyloxy-ethyl)-9-(tert-butyl-dimethyl-silanyloxy)-3-(4-methoxy-benzyloxy)-4,4,8-trimethyl-1,6-dioxa-spiro[4.5]dec-2-yl]-3,5-dihydroxy-7-methoxy-2,4-dimethyl-heptyl ester is a chemical with a specific purpose. Lookchem provides you with multiple data and supplier information of this chemical.

254894-52-5

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254894-52-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 254894-52-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,5,4,8,9 and 4 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 254894-52:
(8*2)+(7*5)+(6*4)+(5*8)+(4*9)+(3*4)+(2*5)+(1*2)=175
175 % 10 = 5
So 254894-52-5 is a valid CAS Registry Number.

254894-52-5Upstream product

254894-52-5Relevant academic research and scientific papers

Total synthesis of (+)-calyculin A and (-)-calyculin B: Asymmetric synthesis of the C(9-25) spiroketal dipropionate subunit

Smith III, Amos B.,Friestad, Gregory K.,Barbosa, Joseph,Bertounesque, Emmanuel,Hull, Kenneth G.,Iwashima, Makoto,Qiu, Yuping,Salvatore, Brian A.,Spoors, P. Grant,Duan, James J.-W

, p. 10468 - 10477 (2007/10/03)

An asymmetric synthesis of the stereochemically fully endowed C(9-25) spiroketal fragment (+)-BC of the calyculins (1-8) is described. Highlights of the synthesis include: a highly diastereoselective IBr-induced iodocarbonate cyclization to introduce the

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