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656221-52-2

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656221-52-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 656221-52-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 6,5,6,2,2 and 1 respectively; the second part has 2 digits, 5 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 656221-52:
(8*6)+(7*5)+(6*6)+(5*2)+(4*2)+(3*1)+(2*5)+(1*2)=152
152 % 10 = 2
So 656221-52-2 is a valid CAS Registry Number.

656221-52-2Relevant articles and documents

Palladium complexes of phosphinamine ligands in the intramolecular asymmetric Heck reaction

Kiely, Denis,Guiry, Patrick J.

, p. 545 - 561 (2007/10/03)

The synthesis of two novel cyclisation substrates for the asymmetric intramolecular Heck reaction is reported. Their cyclisation, in addition to a known substrate for cis-decalin formation, were tested with palladium complexes of BINAP and heterobidentate oxazoline-containing ligands. In general BINAP provides a more active catalyst system for the range of substrates tested although excellent enantioselectivities of up to 85% were obtained with the P,N ligands studied. A trend was noted whereby the t-leucine-derived oxazoline ligands were more reactive and enantioselective than the valine-derived analogues. Similarly, the diphenylphosphinoferrocenyloxazoline ligands were more reactive and selective than the corresponding diphenylphosphinophenyloxazoline ligands.

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