- Photoinduced electron transfer reactions of 3,3-dialkylated 4,5-diphenyl-3h-pyrazoles: A new route to the formation of the solvent adducts
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3,3-Dialkyl-4,5-diphenyl-3H-pyrazoles undergo readily photoinduced electron transfer (PET) reaction with 2,4,6-triphenylpyrylium tetrafluoroborate (TPP+) in acetonitrile to produce cyclopropenes and 2H-pyrroles. During prolonged irradiation, the new ring-closure products derived from 2H-pyrroles as the secondary photoproducts are also produced. However, the corresponding ester analog exhibits different behavior to obtain the cyclopropene as the primary photoproduct and a [2+2] dimer of the cyclopropene as the secondary photoproduct. A rationale for the different behavior is offered.
- Yen, Yao-Pin,Huang, Tseng-Min,Tseng, Yu-Ping,Lin, Hsuan-Yu,Lai, Ching-Cheng
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- Photoinduced electron transfer reactions of 3,3-dialkylated 4,5-diphenyl-3h-pyrazoles: A new route to the formation of the solvent adducts
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3,3-Dialkyl-4,5-diphenyl-3H-pyrazoles undergo readily photoinduced electron transfer (PET) reaction with 2,4,6-triphenylpyrylium tetrafluoroborate (TPP+) in acetonitrile to produce cyclopropenes and 2Hpyrroles. During prolonged irradiation, the new ring-closure products derived from 2H-pyrroles as the secondary photoproducts are also produced. However, the corresponding ester analog exhibits different behavior to obtain the cyclopropene as the primary photoproduct and a [2+2] dimer of the cyclopropene as the secondary photoproduct. A rationale for the different behavior is offered.
- Yen, Yao-Pin,Huang, Tseng-Min,Tseng, Yu-Ping,Lin, Hsuan-Yu,Lai, Ching-Cheng
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p. 393 - 398
(2015/02/02)
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- New Cyclopropyl Building Blocks for Organic Synthesis, 28. Pd(0)-Catalysed Coupling of Cyclopropenylzinc Chlorides and Cyclopropenylstannanes - A New Efficient Synthesis of 1-Phenyl-, 1-Ethenyl-, and 1-Ethynyl-1-cyclopropenes
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zinc chloride (4) reacts with haloarenes and -alkenes as well as 1-bromoacetylenes under Pd(0) catalysis to give the corresponding 1-phenyl-, 1-ethenyl-, and 1-ethynyl-1-cyclopropenes 6 in isolated yield
- Untiedt, Sven,Meijere, Armin de
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p. 1511 - 1516
(2007/10/02)
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- Photochemistry of Cyclopropene Derivatives. 34. Photocycloaddition Reactions of 2-Alkenyl-Substituted Cyclopropenes
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The sensitized irradiation of 2-(4-pentenyl)-substituted cyclopropenes produces tricyclo1,3>octanes by means of novel intramolecular cycloaddition.In dramatic contrast to the photochemical results, thermolysis affords a product co
- Padwa, Albert,Krumpe, Keith E.,Terry, Lenny W.,Wannamaker, M. Woods
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p. 1635 - 1642
(2007/10/02)
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