Archives for Chemistry Experiments of 221012-82-4

Compound(221012-82-4)Recommanded Product: 221012-82-4 received a lot of attention, and I have introduced some compounds in other articles, similar to this compound((R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine), if you are interested, you can check out my other related articles.

Recommanded Product: 221012-82-4. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: (R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine, is researched, Molecular C38H34N2O4P2, CAS is 221012-82-4, about Atropisomeric [(diphosphine)Au2Cl2] Complexes and their Catalytic Activity Towards Asymmetric Cycloisomerisation of 1,6-Enynes. Author is Barreiro, Elena M.; Boltukhina, Ekaterina V.; White, Andrew J. P.; Hii, King Kuok.

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.

Compound(221012-82-4)Recommanded Product: 221012-82-4 received a lot of attention, and I have introduced some compounds in other articles, similar to this compound((R)-2,2′,6,6′-Tetramethoxy-4,4′-bis(diphenylphosphino)-3,3′-bipyridine), if you are interested, you can check out my other related articles.

Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider