Carbocation Catalysis: Oxa-Diels-Alder Reactions of Unactivated Aldehydes and Simple Dienes
作者:Mahmoud Abd El Aleem Ali Ali El Remaily、Veluru Ramesh Naidu、Shengjun Ni、Johan Franzén
DOI:10.1002/ejoc.201501112
日期:2015.10
organocatalyst is demonstrated in the oxa-Diels-Alder reaction of various unactivated aromatic and aliphatic aldehydes and simple unactivated dienes, such as isoprene and 2,3-dimethylbutadiene. The transformation proceeds smoothly to give 3,6-dihydropyrane adducts in high to moderate yields with catalyst loadings down to 1.0 mol-% under mild reaction conditions. In contrast to most previously reported
The present invention refers to dihydropyran derivatives, and to a process of making the same. The invention further refers to perfume compositions and fragranced articles comprising them.
本发明涉及二氢吡喃衍生物及其制备方法。该发明还涉及香水组合物和含有它们的香气制品。
ORGANIC COMPOUNDS
申请人:Givaudan SA
公开号:US20210355411A1
公开(公告)日:2021-11-18
The present invention refers to dihydropyran derivatives, and to a process of making the same. The invention further refers to perfume compositions and fragranced articles comprising them.
Scandium(III) Perfluorooctanesulfonate [Sc(OPf)<sub>3</sub>] : A Novel Catalyst for the Hetero Diels–Alder Reaction of Aldehydes with Non-Activated Dienes
Scandium(III) perfluorooctanesulfonate [scandium(III) perflate, Sc(OPf)3] was prepared from either scandium(III) chloride or oxide and perfluorooctanesulfonic acid. The perflate thus obtained acts as a novel Lewis acid catalyst for the intermolecular hetero Diels–Alderreaction of aldehydes with non-activated dienes under mild conditions. The characteristic features of the catalyst include (i) low