Murugesan, Kathiravan published the artcileNickel-catalyzed stereodivergent synthesis of E- and Z-alkenes by hydrogenation of alkynes, Formula: C22H23BO4, the publication is ChemSusChem (2019), 12(14), 3363-3369, database is CAplus and MEDLINE.
A convenient protocol for stereodivergent hydrogenation of alkynes to E- and Z-alkenes R1CH=CHR2 [R1 = Ph, 4-ClC6H4, 4-BrC6H4, etc.; R2 = Et, 4-EtC6H4, 4-H2NC6H4, etc.; stereo = E, Z] by using nickel catalysts was developed. Simple Ni(NO3)2·6H2O as a catalyst precursor formed active nanoparticles, which were effective for the semihydrogenation of several alkynes with high selectivity for the Z-alkene (Z/>99:1). Upon addition of specific multidentate ligands (triphos, tetraphos), the resulting mol. catalysts were highly selective for the E-alkene products (E/Z>99:1). Mechanistic studies revealed that the Z-alkene-selective catalyst was heterogeneous whereas the E-alkene-selective catalyst was homogeneous. In the latter case, the alkyne was first hydrogenated to a Z-alkene, which was subsequently isomerized to the E-alkene. This proposal was supported by d. functional theory calculations
ChemSusChem published new progress about 1448637-05-5. 1448637-05-5 belongs to esters-buliding-blocks, auxiliary class Alkynyl,Boronic acid and ester,Benzene,Ester,Boronate Esters,Boronic Acids,Boronic acid and ester,, name is Methyl 4-((4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)ethynyl)benzoate, and the molecular formula is C22H23BO4, Formula: C22H23BO4.
Referemce:
https://en.wikipedia.org/wiki/Ester,
Ester – an overview | ScienceDirect Topics