Synthesis of Bidentate Nitrogen Ligands by Rh-Catalyzed C–H Annulation and Their Application to Pd-Catalyzed Aerobic C–H Alkenylation
作者:Hyun Tae Kim、Eunsu Kang、Minkyu Kim、Jung Min Joo
DOI:10.1021/acs.orglett.1c01040
日期:2021.5.7
A new class of bidentate ligands was prepared by a modular approach involving Rh-catalyzedC–H annulation reactions. The resulting conformationally constrained ligands enabled the Pd-catalyzed C–H alkenylation at electron-rich and sterically less hindered positions of electron-rich arenes while promoting the facile oxidation of Pd(0) intermediates by oxygen. This newly introduced ligand class is complementary
Ultra-violet absorbing compounds and compositions containing said compounds
申请人:GRAESSER LABORATORIES LIMITED
公开号:EP0153089A1
公开(公告)日:1985-08-28
2-Ethylhexyl and 2-octyl p-dimethylaminocinnamates unexpectedly are liquid at room temperature and miscible with liquid paraffin (i.e. mineral oil) unlike related alkyl p-dimethylaminocinnamates such as 1-octyl p-dimethylaminocinnamate. They absorb light in the melanogenic range 320 to 420 nm and are dermatoligically acceptable and hence useful as UVA absorbers in sunscreen and cosmetic compositions.