2-Aminobenzimidazole and -benzoxazole as N-nucleophile in palladium-catalysed aminocarbonylation
作者:Máté Gergely、Attila Bényei、László Kollár
DOI:10.1016/j.tet.2020.131079
日期:2020.4
Palladium-catalysed aminocarbonylation of aryl iodides in the presence of 2-aminobenzimidazole and 2-aminobenzoxazole as N-nucleophile was carried out. Single CO insertion took place, however, instead of the expected carboxamides (C(O)NH) the corresponding N-acyl-imine (C(O)NC) derivatives were obtained. The structure of the latter compounds can be explained by tautomerization involving the heterocyclic
N-(Benzimidazol-2-yl)arylcarboxamides as ultraviolet (UV) light absorbers
申请人:Merck & Co., Inc.
公开号:US04011236A1
公开(公告)日:1977-03-08
This invention relates to compositions containing N-(benzimidazol-2-yl)arylcarboxamides as ultraviolet (UV) light absorbers. The compounds are useful to protect UV sensitive materials, particularly plastic compositions, or ingredients thereof such as dyes, anti-microbial agents, or plasticizers from attack by ultraviolet light. The compositions are suitable for those uses where UV protection is required only for short periods of time, for example in sun tan lotions, as well as for uses which require protection for extended periods of time.