Journal of the American Chemical Society, volume 139, issue 44, pages 15812-15820

Wavelength Dependence of Light-Induced Cycloadditions

Jan P Menzel 1, 2
Benjamin T. Noble 3
Andrea Lauer 1, 2, 4
James P. Blinco 1
Christopher Barner‐Kowollik 1, 2, 4
Publication typeJournal Article
Publication date2017-10-25
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor15
ISSN00027863, 15205126
General Chemistry
Catalysis
Biochemistry
Colloid and Surface Chemistry
Abstract
The wavelength-dependent conversion of two rapid photoinduced ligation reactions, i.e., the light activation of o-methylbenzaldehydes, leading to the formation of reactive o-quinodimethanes (photoenols), and the photolysis of 2,5-diphenyltetrazoles, affording highly reactive nitrile imines, is probed via a monochromatic wavelength scan at constant photon count. The transient species are trapped by cycloaddition with N-ethylmaleimide, and the reactions are traced by high resolution mass spectrometry and nuclear magnetic resonance spectroscopy. The resulting action plots are assessed in the context of Beer-Lambert's law and provide combined with time-dependent density functional theory and multireference calculations an in-depth understanding of the underpinning mechanistic processes, including conical intersections. The π → π* transition of the carbonyl group of the o-methylbenzaldehyde correlates with a highly efficient conversion to the cycloadduct, showing no significant wavelength dependence, while conversion following the n → π* transition proceeds markedly less efficient at longer wavelengths. The influence of absorbance and reactivity has critical consequences for an effective reaction design: At high concentrations of o-methylbenzaldehydes (c = 8 mmol L-1), photoligations with N-ethylmaleimide (possible for λ ≤ 390 nm) are ideally performed at 330 nm, whereas at high light penetration regimes at lower concentrations (c = 0.3 mmol L-1), 315 nm irradiation leads to the highest conversion. Activation and trapping of 2,5-diphenyltetrazoles (possible for λ ≤ 322 nm) proceeds best at a wavelength shorter than 295 nm, irrespective of concentration.

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Menzel J. P. et al. Wavelength Dependence of Light-Induced Cycloadditions // Journal of the American Chemical Society. 2017. Vol. 139. No. 44. pp. 15812-15820.
GOST all authors (up to 50) Copy
Menzel J. P., Noble B. T., Lauer A., Coote M. L., Blinco J. P., Barner‐Kowollik C. Wavelength Dependence of Light-Induced Cycloadditions // Journal of the American Chemical Society. 2017. Vol. 139. No. 44. pp. 15812-15820.
RIS |
Cite this
RIS Copy
TY - JOUR
DO - 10.1021/jacs.7b08047
UR - https://doi.org/10.1021/jacs.7b08047
TI - Wavelength Dependence of Light-Induced Cycloadditions
T2 - Journal of the American Chemical Society
AU - Lauer, Andrea
AU - Menzel, Jan P
AU - Coote, Michelle L.
AU - Blinco, James P.
AU - Barner‐Kowollik, Christopher
AU - Noble, Benjamin T.
PY - 2017
DA - 2017/10/25 00:00:00
PB - American Chemical Society (ACS)
SP - 15812-15820
IS - 44
VL - 139
SN - 0002-7863
SN - 1520-5126
ER -
BibTex |
Cite this
BibTex Copy
@article{2017_Menzel,
author = {Andrea Lauer and Jan P Menzel and Michelle L. Coote and James P. Blinco and Christopher Barner‐Kowollik and Benjamin T. Noble},
title = {Wavelength Dependence of Light-Induced Cycloadditions},
journal = {Journal of the American Chemical Society},
year = {2017},
volume = {139},
publisher = {American Chemical Society (ACS)},
month = {oct},
url = {https://doi.org/10.1021/jacs.7b08047},
number = {44},
pages = {15812--15820},
doi = {10.1021/jacs.7b08047}
}
MLA
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MLA Copy
Menzel, Jan P., et al. “Wavelength Dependence of Light-Induced Cycloadditions.” Journal of the American Chemical Society, vol. 139, no. 44, Oct. 2017, pp. 15812-15820. https://doi.org/10.1021/jacs.7b08047.
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