Bao, Robert Li-Yuan; Yin, Junjie; Shi, Lei; Zheng, Limin published the article 《Rh(I)-Catalyzed enantioselective and scalable [4 + 2] cycloaddition of 1,3-dienes with dialkyl acetylenedicarboxylates》. Keywords: rhodium phosphoramidite catalyzed enantioselective cycloaddition diene acetylenedicarboxylate; cyclohexadiene carbonyl derivative enantioselective synthesis.They researched the compound: Bis(norbornadiene)rhodium (I) tetrafluoroborate( cas:36620-11-8 ).HPLC of Formula: 36620-11-8. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:36620-11-8) here.
An asym. intermol. [4 + 2] cycloaddition of 1,3-dienes with dialkyl acetylenedicarboxylates, which was catalyzed by a rhodium(I)-chiral phosphoramidite complex, was developed. This protocol provided a highly enantioselective access to prepare carbonyl substituted cyclohexa-1,4-dienes with up to 96% yield and >99% ee [e.g., di-Me acetylenedicarboxylate + (E)-1,3-nonadiene → I (96%, 99% ee)]. Notably, a cycloaddition on the 10 g scale gave the product in 92% yield and with 99% ee, which showed great potential for the scale-up synthesis of carbonyl substituted cyclohexa-1,4-dienes. In addition, oxidative aromatizations and hydrolysis of the products were also investigated.
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Reference:
Quinuclidine – Wikipedia,
Quinuclidine | C7H13N | ChemSpider