Barreiro, Elena M.’s team published research in Chemistry – A European Journal in 21 | CAS: 503538-69-0

Barreiro, Elena M. published the artcileAtropisomeric [(diphosphine)Au₂Cl₂] Complexes and their Catalytic Activity Towards Asymmetric Cycloisomerisation of 1,6-Enynes, Category: dioxole, the publication is Chemistry – A European Journal (2015), 21(6), 2686-2690, database is CAplus and MEDLINE.

X-ray crystal structures of two [(diphosphine)Au₂Cl₂] complexes (in which diphosphine = P-Phos and xylyl-P-Phos; P-Phos = [2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine]) were determined and compared to the reported structures of similar atropisomeric gold complexes. Correlations between the Au-Au distances and torsional angles for the biaryl series of ligands (MeOBIPHEP, SEGPhos, and P-Phos; BIPHEP = 2,2′-bis(diphenylphosphino)-1,1′-biphenyl, SEGPhos = [(4,4′-bi-1,3-benzodioxole)-5,5′-diyl]bis[diphenylphosphine]) can be made; these measurements appear to be very dependent upon the phosphorus substituent. Conversely, the same effect was not observed for ligands based on the binaphthyl (BINAP) series. The catalytic activity of these complexes was subsequently assessed in the enantioselective cycloisomerization of 1,6-enynes ArCCCH₂OCH₂CH:CHC₆H₅ (Ar = 4-O₂NC₆H₄, 3-CH₃OC₆H₄, C₆H₅, 4-CH₃C₆H₄) and revealed an over-riding electronic effect: more-electron-rich phosphines promote greater enantioselectivity. The possibility of silver acting as a (co-) catalyst was ruled out in these reactions.

Chemistry – A European Journal published new progress about 503538-69-0. 503538-69-0 belongs to dioxole, auxiliary class (Atropisomeric Bisphosphine Ligands, name is (R)-5,5′-Bis(diphenylphosphino)-2,2,2′,2′-tetrafluoro-4,4′-bi-1,3-benzodioxole, and the molecular formula is C38H24F4O4P2, Category: dioxole.

Referemce:
https://en.wikipedia.org/wiki/1,3-Benzodioxole,
Dioxole | C3H4O2 – PubChem