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 Copper-catalyzed skeletal rearrangement of O-propargylic aryloximes into four-membered cyclic nitrones – chirality transfer and mechanistic insight, published in 2012-05-16, which mentions a compound: 32717-95-6, mainly applied to aryl oxime propargyl ether regioselective rearrangement copper catalyst; azetidine cyclic nitrone preparation, SDS of cas: 32717-95-6.
Cu-catalyzed skeletal rearrangement of (E)-configurated O-propargylic aryl oximes were carried out to afford the corresponding 4-membered cyclic nitrones in good to excellent yields. The optimal reaction conditions of the highly regioselective reactions involved the use of [CuCl(cod)]2 in MeCN at 70°. In the case of (Z)-configurated derivatives, however, the reaction proceeded in the absence of the Cu catalysts to afford the identical compound in good yields. Furthermore, the reactions were also carried out using chiral substrates in the presence of Cu catalysts to afford the corresponding products with good levels of chirality transfer.
In addition to the literature in the link below, there is a lot of literature about this compound(Chloro(1,5-cyclooctadiene)copper(I) dimer)SDS of cas: 32717-95-6, illustrating the importance and wide applicability of this compound(32717-95-6).
Reference:
Quinoxaline – Wikipedia,
Quinoxaline | C8H6N2 | ChemSpider