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2071-24-1

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2071-24-1 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 2071-24-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 2,0,7 and 1 respectively; the second part has 2 digits, 2 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 2071-24:
(6*2)+(5*0)+(4*7)+(3*1)+(2*2)+(1*4)=51
51 % 10 = 1
So 2071-24-1 is a valid CAS Registry Number.

2071-24-1Relevant articles and documents

Dangling phosphine complexes: Phosphine exchange in pentacarbonyl tungsten complexes of bis(diphenylphosphinomethyl)phenylphosphine

Gamage, Chaminda P.,Bailey, Ryan C.,Keiter, Ellen A.,Kuczynski, John R.,Wheeler, Kraig A.,Stern, Charlotte L.,Brandt, Douglas E.,Keiter, Richard L.

, p. 258 - 265 (2015)

Abstract The reaction of [W(CO)5NH2Ph] with Ph2PCH2PPhCH2PPh2 under mild conditions and stoichiometric control leads to two sets of linkage isomers: [(OC)5W{κ1-PPh(CH2PPh2)2}] 6a and [(OC)5W(κ1- PPh2CH2PPhCH2PPh2)] 6b; [(OC)5W{μ-PPh2CH2PPh(CH2PPh2)}W(CO)5] 7a and [(OC)5W(μ-PPh2CH2PPhCH2PPh2)W(CO)5] 7b. Isomers 6a and 6b exist in solution in equilibrium with K = 4.35 for 6b/6a in CDCl3 at 55 °C. Under the same conditions, the rate of isomerization of 6a to 6b is 4.32 × 10-6 s-1. Isomerization is thought to proceed by an initial attack of a carbonyl group by a pendant phosphine followed by ring opening and a 1,2-phosphine shift. At higher temperatures, chelated complexes with four- and six-membered rings are formed: [(OC)5W{μ-κ1-, κ2-PPh2CH2 (PhPCH2PPh2)W(CO)4 }] 9a, [(OC)5W{μ-κ1-, κ2-PPh (CH2PPh2)2}W(CO)4 }] 9b, and [(OC)4W{κ2-(PPh2CH2)2PPh}] 10b. X-ray crystal structures of 6a, 7b, and 9b have been determined.

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