82840-54-8

Basic information

• Product Name: ((C₆H₅)2PCH₂CH₂P(C₆H₅)2)NiCH(CH₃)CH₂COO
• Synonyms: ((C₆H₅)2PCH₂CH₂P(C₆H₅)2)NiCH(CH₃)CH₂COO
• CAS NO: 82840-54-8
• Molecular Weight: 543.205
• Mol File: 82840-54-8.mol
• Article Data: 3

Chemical Properties

• CAS DataBase Reference: ((C₆H₅)2PCH₂CH₂P(C₆H₅)2)NiCH(CH₃)CH₂COO(CAS DataBase Reference)
• NIST Chemistry Reference: ((C₆H₅)2PCH₂CH₂P(C₆H₅)2)NiCH(CH₃)CH₂COO(82840-54-8)
• EPA Substance Registry System: ((C₆H₅)2PCH₂CH₂P(C₆H₅)2)NiCH(CH₃)CH₂COO(82840-54-8)

Safety Data

• Hazardous Substances Data: 82840-54-8(Hazardous Substances Data)

Upstream product

• 1295-35-8 bis(1,5-cyclooctadiene)nickel ⁽⁰⁾ 
• 4100-80-5 2-methylsuccinic anhydride 
• 82840-52-6 (1,2-bis(diphenylphosphino)ethane)NiCH₂CH₂CH₂COO 

Downstream Products

• 4100-80-5 2-methylsuccinic anhydride 

Relevant articles and documents

Effect of Ligand on Ring Contraction of Six-Membered Nickel-Containing Cyclic Esters, , to Their Five-Membered-Ring Isomers, . Kinetic and Thermodynamic Control of Asyammetric Induction by Chiral Diphosphines in the Ring Contraction

Ring contraction of (1) to (2) is accelerated by coordination of bulky ligands: coordination of a bulky diphosphine like 1,2-bis(diphenylphosphino)ethane (dpe) causes an extensive ring contraction to afford (dpe).Use of a chiral diphosphine affords a mixture of unequal amounts of diastereomers (chiral diphosphine)-(R) ((R)-2) and (chiral diphosphine)-(S)- ((S)-2).When (S,S)-chiraphos is used, (R)-2 is kinetically favored, but it isomerizes to thermodynamically favored (S)-2 obeying the first-order kinetics.The equilibrated reaction mixture after the isomerization contains ((S,S)-chiraphos) in 54percent diastereomer excess at 24 deg C, and the kinetic and thermodynamic parameters for the R to S isomerization are as follows: ΔH = 93 +/- 2 kJ/mol, ΔS = -8 +/- 6 J/(K mol), ΔG = 95 kJ/mol, ΔH = 13 +/- 2 kJ/mol, ΔS = 54 +/- 6J (K mol), and ΔG = -3.0 kJ/mol at 24 deg C.Use of (R,R)-dipamp gives a result opposite to that of (S,S)-chiraphos concerning the kinetically and thermodynamically favored species.Data obtained by use of (R)-prophos, trans-cypenphos, and trans-renorphos are also given.The kinetic and thermodynamic control of the asymmetry can be explained by considering the effects of arrangement of two phenyl groups bonded to each phosphorous atom of the diphosphine ligands on the metallacycle entity.

PREPARATION OF SEVERAL NEW Ni- OR Pd-CONTAINING CYCLIC AMIDE AND ESTERS, (PR3)nNi(CH2CH2CH2COZ) (Z=NH, O) AND PCy3Pd(CH2CH2CH2COO), AND RING CONTRACTION OF THE SIX-MEMBERED Ni-CONTAINING CYCLIC ESTER TO ITS FIVE-MEMBERED ISOMER

New metallacyclic amide and esters (PCy3Ni(CH2CH2CH2CONH), (PR3)nNi(CH2CH2CH2COO), PCy3Pd(CH2CH2CH2COO) ) have been prepared by reactions of zero-valent nickel and palladium complexes with unsaturated amide and acid.The 6-membered Ni-containing cyclic ester undergoes a ring contraction reaction to a 5-membered isomer.