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203380-20-5

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203380-20-5 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 203380-20-5 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,3,8 and 0 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 203380-20:
(8*2)+(7*0)+(6*3)+(5*3)+(4*8)+(3*0)+(2*2)+(1*0)=85
85 % 10 = 5
So 203380-20-5 is a valid CAS Registry Number.

203380-20-5Relevant articles and documents

Synthesis of chiral organotin reagents: Synthesis of diphenyl-{(1S,2R,3S,4R)-3-(alkoxymethyl)bicyclo[2.2.1]heptan-2-yl}tin hydrides. X-Ray crystal structure of (R)-4,4-dimethyl-2-oxotetrahydrofuran-3-yl (1S,2S,3R,4R)-3-triphenylstannylbicyclo[2.2.1]hept-5-ene-2-carboxylate

Beddoes, Roy,Pratt, Robert M.,Thomas, Eric J.

, p. 717 - 726 (2007/10/03)

Conditions have been developed for the stereoselective Diels-Alder addition of cyclopentadiene to (R)-4,4-dimethyl-2-oxotetrahydrofuran-3-yl (E)-3-triphenylstannylprop-2-enoate 10 to give the endo-adduct 14 whose structure has been confirmed by X-ray crystallography. The adduct 14 is converted into (1S,2R,3S,4R)-3-hydroxymethylbicyclo[2.2.1]heptan-2-yl(triphenyl)stannane 22 which is shown to have an enantiomeric excess (ee) of 94%. This alcohol has been converted into its methyl ether (-)-3, trityl ether 25, tert-butyldimethylsilyl ether 26 and 1-naphthoate 27 which give the tin hydrides 4, 31-34 on treatment with iodine and sodium borohydride. Aspects of the chemistry of these enantiomerically enriched tin hydrides are briefly discussed.

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