Journal
CATALYSTS
Volume 9, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/catal9110942
Keywords
catalysis; cyclotrimerization; spirobifluorene; fluorescence; regioselectivity
Categories
Funding
- Czech Science Foundation [18-17823S]
- OP VVV project [CZ.02.1.01/0.0/0.0/15_003/0000417 - CUCAM]
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A method for regioselective synthesis of 2,4-disubstituted and more highly substituted fluorenols using catalytic [2+2+2]cyclotrimerization of mono- and disubstituted diynes with terminal alkynes was explored. In the former case, the preferential formation of the 2,4-regioisomers was achieved in the presence of Cp*Ru(cod)Cl, whereas Rh-based catalysts tended to provide 3,4-regioisomers as the major products. The 2,4-disubstituted fluorenols were converted into the corresponding 9,9'-spirobifluorene derivatives and their structural and photophysical properties were evaluated.
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