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78133-67-2

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78133-67-2 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 78133-67-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,1,3 and 3 respectively; the second part has 2 digits, 6 and 7 respectively.
Calculate Digit Verification of CAS Registry Number 78133-67:
(7*7)+(6*8)+(5*1)+(4*3)+(3*3)+(2*6)+(1*7)=142
142 % 10 = 2
So 78133-67-2 is a valid CAS Registry Number.

78133-67-2Relevant articles and documents

The Reaction between Bis(trimethylsilyl)cyclopentadiene and Dichloroketen, and the Diels-Alder Reactions between N-Phenylmaleimide and Two Silylated Methylcyclopentadienes

Fleming, Ian,Williams, Richard Vaughan

, p. 684 - 688 (2007/10/02)

Bis(trimethylsilyl)cyclopentadiene reacts with dichloroketen to give only the adduct (7) derived from the 2,5-disilylated isomer (5).Methyl(trimethylsilyl)cyclopentadiene (18) and trimethylsilylmethylcyclopentadiene (21) give Diels-Alder adducts (19) and (20) and (22) and (23) in which the regioselectivity is unaffected by the presence of the silyl group.Epoxidation of the edduct (22) and acid-catalysed opening of the epoxide lead to formation of the exo-methylenenorbornane (26) in a rearrangement controlled by the presence of the silyl group.

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