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ChemComm
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COMMUNICATION
Journal Name
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2015, 54, 15400; (b) P. Sun, Y. Wu, T. YDanOgI:,1X0..1W03u9,/DJ.0XCuC,0A6.0L3i8nK,
H. Yao, Adv. Synth. Catal., 2015, 357, 2469.
excited states for 6a-e in solution and solid state. Our studies
can further be applied in developing new organic
fluorophores,15 by investigating their photophysical properties
and potential applications of organic fluorescent molecules in
smart materials, optoelectronic devices, fluorescent sensors,
and biomedical imaging.19 We have measured the absorption
and emission spectra in DCM solution and thin-film are listed in
(Figure 2). The fluorescence of compound 6a–6e shows
emission maxima at 456–472 nm in DCM solution and 492-529
nm in thin-film (for details of PL study see ESI).
(a) V. Zhdankin, John Wiley & Sons., 2013; (b) T. Dohi, Y. Kita,
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Figure 2. (a) Normalized absorption of 6a, 6b, 6c, and 6e in DCM solution (solid
line), and thin film (dotted line); (b) Normalized fluorescence 6a, 6b, 6c, and 6e in
DCM solution (solid line), and thin film (dotted line); Con 5.0 µM; Excitation
wavelength is 380 nm.
9
(a) A. J. Burke, C. S. Marques, Wiley-VCH, Weinheim, Germany,
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In summary, the first example of Rh(III)-catalysed C-H bond
activation of N-methoxybenzamide with HVI deployed as a
carbene precursor has been reported. The cyclisation reaction
is compatible with various electronically substituted functional
groups, substituted benzamides and HVI’s. The detailed
mechanistic investigation was demonstrated by deuterium
labelling studies, competitive experiments and DFT calculations.
Furthermore, DFT calculations revealed that the C−H activation
process is the rate-limiting step, which is in good agreement
with experimental KIE results. Besides, the N-deprotected
dihydrophenanthridines were subjected to peri C-H/O-H bond
activation/annulation with alkyne upon Rh(III)-catalyst and the
resulted pyranoisocoumarins and their photophysical
properties were investigated.
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4
, 199.
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D. D. Subhedar, A. A. Mishra, B. M. Bhanage, Adv. Synth.
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N.U.M. thanks the Director Dr. K. J. Seeram CSIR-CLRI and S.
M. acknowledges the CSIR, India, for providing a Senior
Research Fellowship (Grant No. 31/6(422)/2017-EMR-I).
Conflicts of interest
There are no conflicts to declare
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4 | J. Name., 2012, 00, 1-3
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