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Palladium‐Catalyzed Selective Synthesis of Naphthalenes and Indenones and Their Luminescent Properties
Author(s) -
Chen Xiaopeng,
Jin Jisong,
Wang Ningning,
Lu Ping,
Wang Yanguang
Publication year - 2012
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201101506
Subject(s) - chemistry , palladium , catalysis , amine gas treating , cyclohexane , aryl , photochemistry , absorption (acoustics) , combinatorial chemistry , organic chemistry , alkyl , physics , acoustics
Selective synthesis of functionalized naphthalenes and indenones by palladium‐catalyzed cyclization of o ‐haloacetophenones and terminal alkynes in the presence of a secondary amine is reported. Under a nitrogen atmosphere, the palladium‐catalyzed reaction of o ‐haloacetophenones with terminal alkynes in the presence of wet secondary aminesgenerated 1‐(dialkylamino)‐3‐aryl/alkylnaphthalenes. When the reaction was conducted in air, 1‐indenone‐3‐carbaldehydes were obtained. The synthesized β‐arylnaphthalenes 4a – f emit light in a range from 386 to 452 nm with quantum yields from 0.10 to 0.48 in cyclohexane. The absorption and emission efficiency of 4d were finely tuned by the acidity of the environment, and this might be useful in the use of 4d as a fluorescent pH sensor.