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197297-77-1

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197297-77-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 197297-77-1 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,7,2,9 and 7 respectively; the second part has 2 digits, 7 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 197297-77:
(8*1)+(7*9)+(6*7)+(5*2)+(4*9)+(3*7)+(2*7)+(1*7)=201
201 % 10 = 1
So 197297-77-1 is a valid CAS Registry Number.

197297-77-1Relevant articles and documents

Highly stereoselective construction of the C2 stereocentre of α-tocopherol (Vitamin E) by asymmetric addition of Grignard reagents to ketones

Bieszczad, Bartosz,Gilheany, Declan G.

, p. 6483 - 6492 (2017/08/16)

Tertiary alcohol precursors of both C2 diastereoisomers of α-tocopherol were prepared in three ways by our recently reported asymmetric Grignard synthesis. The versatility of Grignard chemistry inherent in its three-way disconnection was exploited to allow the synthesis of three product grades: 77:23 dr (5 steps), 81:19 dr (5 steps) and 96:4 dr (7 steps, one gram scale) from readily available and abundant starting materials. The products were converted to their respective α-tocopherols in 3 steps, which allowed a definitive re-assignment of their absolute configurations.

Preparation of Enantiopure Precursors for the Vitamin E Synthesis. A Comparison of the Asymmetric Allylation of Ketones and the Sharpless Bishydroxylation

Tietze, Lutz F.,G?rlitzer, Jochen

, p. 1049 - 1050 (2007/10/03)

The enantioselective synthesis of the precursors 9, 10, 16 and 17 for the preparation of enantiopure vitamin E by asymmetric allylation of the ketone 6 and Sharpless bishydroxylation of the aliphatic alkenes 11 and 15 is described.

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