the first examples of catalyticenantioselective benzilic ester rearrangement reaction. In the presence of a catalytic amount of Cu(OTf)2 and a chiral box ligand under mild conditions, reaction of 2,3-diketoesters with alcohols afforded structurally diverse α-aryl(alkyl) substituted-α-hydroxy malonates (tartronic esters) in good to excellent yields with high enantioselectivities. Preliminary mechanistic
Three new electron‐rich metal–organic frameworks (MOF‐1–MOF‐3) have been synthesized by employing ligands bearing aromatic tags. The key role of the chosen aromatic tags is to enhance the π‐electron density of the luminescent MOFs. Single‐crystal X‐ray structures have revealed that these MOFs form three‐dimensional porous networks with the aromatic tags projecting inwardly into the pores. These highly
Detection of trace chemicals in oil and gas applications
申请人:Murugesan Sankaran
公开号:US10739269B2
公开(公告)日:2020-08-11
A method of analyzing a well sample for a well treatment additive includes contacting the sample with functionalized metallic nanoparticles that contain metallic nanoparticles functionalized with a functional group including a cyano group, a thiol group, a carboxyl group, an amino group, a boronic acid group, an aza group, an ether group, a hydroxyl group, or a combination including at least one of the foregoing; irradiating the sample contacted with the functionalized metallic nanoparticles with electromagnetic radiation at a selected energy level; measuring a Raman spectrum emitted from the sample; and determining presence, type or concentration of the well treatment additive in the sample from the Raman spectrum.
The present disclosure relates to rheology-modifying agents and methods of modifying the rheology of slurries. A rheology-modifying agent may be added to a slurry. The rheology-modifying agent may include a polymer and the polymer may include at least three chemically different monomers. The slurry may include lime and/or magnesium hydroxide.