In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called SYNPHOS: a New Atropisomeric Diphosphine Ligand. From Laboratory-scale Synthesis to Scale-up Development, published in 2003-06-30, which mentions a compound: 52287-51-1, mainly applied to SYNPHOS atropisomeric diphosphine ligand preparation ruthenium catalyzed asym hydrogenation; ethylenedioxy biphenyldiyl diphosphine preparation ruthenium catalyzed asym hydrogenation; ketone ruthenium atropisomeric diphosphine complex catalyzed asym hydrogenation, Electric Literature of C8H7BrO2.
A new optically active diphosphine ligand, [(5,6),(5′,6′)-bis(ethylenedioxy)biphenyl-2,2′-diyl]bis(diphenylphosphine) (SYNPHOS) I has been synthesized. Laboratory-scale synthesis and scale-up development of this ligand are described herein. This new atropisomeric diphosphine was also used in ruthenium-catalyzed asym. hydrogenation.
If you want to learn more about this compound(6-Bromo-2,3-dihydrobenzo[b][1,4]dioxine)Electric Literature of C8H7BrO2, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(52287-51-1).
Reference:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics