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128405-33-4

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128405-33-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 128405-33-4 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,2,8,4,0 and 5 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 128405-33:
(8*1)+(7*2)+(6*8)+(5*4)+(4*0)+(3*5)+(2*3)+(1*3)=114
114 % 10 = 4
So 128405-33-4 is a valid CAS Registry Number.

128405-33-4Downstream Products

128405-33-4Relevant articles and documents

Experimental studies of the anomeric effect. Part III. Rotameric preferences about the exo-cyclic c2-x bond in equatorial and axial 2-methoxy-and 2-methylamino-tetrahydropyrans

Booth, Harold,Dixon, J. Mark,Khedhair, Khedhair A.,Readshaw, Simon A.

, p. 1625 - 1652 (1990)

Values of3 J(CC), 3J(CH), 4J(CH) and 3J(HH), supported by n.O.enhancements, in nmr spectra of 2-methoxy- and 2-methyl-amino-tetrahydropyrans, point to a very strong preference for rotamers in which an exo-cyclic heteroatom lone pair is antiperiplanar to the endo-cyclic C2-O bond ("endo-anomeric effect").

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