537-67-7Relevant articles and documents
Esterification of fatty acids in greases to fatty acid methyl esters with highly active diphenylamine salts
Ngo, Helen L.,Vanselous, Heather,Strahan, Gary D.,Haas, Michael
, p. 563 - 570 (2013)
Diphenylamine sulfate (DPAS) and diphenylamine hydrochloride (DPACl) salts were found to be highly active catalysts for esterification and substantial transesterification of inexpensive greases to fatty acid methyl esters (FAME). In the presence of catalytic amounts of DPAS or DPACl and excess methanol, the free fatty acids as well as the acylglycerols in waste greases were converted to FAME at 125 °C within 1 h. Although the DPAS and DPACl catalysts were found to have similar catalytic activities to their parent liquid acids (i.e., sulfuric and hydrochloric acids) the diphenylammonium salts are much easier to work with than concentrated liquid acids.
A Discrete Dichloride Tetrahydrate Trapped by a Cyclopropenium Cation: Structure and Spectroscopic Properties
Abdelbassit, Mohammed S.,Crittenden, Deborah L.,Curnow, Owen J.,Ferreras, Manuel
, p. 927 - 932 (2020)
A discrete dichloride tetrahydrate cluster, [Cl2(H2O)4]2?, was obtained as a salt of the bis(diphenylamino)diethylamino cyclopropenium cation [C3(NPh2)2(NEt2)]+ and characterized by single-crystal X-ray diffraction and infrared spectroscopy. This chloride–chloride ion-pair cluster consists of a [Cl2(H2O)2]2? square with opposite edges bridged by water molecules to give a chair-like structure of the non-hydrogen atoms. The solid-state structure is essentially the same as the calculated gas-phase structure. Infrared spectra were also collected on the deuterium analogue [Cl2(D2O)4]2?. Computational studies were carried out on gas-phase [Cl2(H2O)4]2? to confirm the infrared band assignments in the solid state. The structure and infrared spectrum are consistent with the discrete nature of the cluster.
