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Spinal Cord Transection In Xenopus laevis Tadpoles

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p-Benzyne.

Ralph Marquardt¹, Andreas Balster¹, Wolfram Sander¹

¹Lehrstuhl für Organische Chemie II der Universität, D-44780 Bochum (Germany), Fax: (+49) 234-709-4353.

Angewandte Chemie (International Ed. in English)

|May 2, 2018

Summary

This summary is machine-generated.

Photochemical reactions of peroxides and 1,4-diiodobenzene in noble gas matrices produced p-benzyne. Vapor-phase pyrolysis confirmed peroxide decomposition yields p-benzyne, a reactive intermediate.

Keywords:

Ab initio calculations Density functional calculations Matrix isolation Photochemistry Radicals

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Area of Science:

Organic Chemistry
Photochemistry
Spectroscopy

Background:

Diacetyl terephthaloyl diperoxide and dipropionyl terephthaloyl diperoxide are organic compounds.
1,4-diiodobenzene is an organohalogen compound.
Low-temperature noble gas matrices are used to study reactive intermediates.

Purpose of the Study:

To investigate the photochemical behavior of diacetyl terephthaloyl diperoxide, dipropionyl terephthaloyl diperoxide, and 1,4-diiodobenzene.
To identify reaction products using infrared (IR) spectroscopy and computational methods.
To confirm the formation of p-benzyne via pyrolysis experiments.

Main Methods:

Photolysis of peroxides and 1,4-diiodobenzene in a low-temperature noble gas matrix.
Infrared (IR) spectroscopy to detect reaction products.
B3LYP computational calculations to predict IR absorption bands.
Vapor-phase pyrolysis experiments.

Main Results:

Photoreactions produced a compound with characteristic IR absorption bands at 725 and 980 cm⁻¹.
These IR bands disappeared upon annealing the matrix.
The observed IR bands matched calculated frequencies for 1,4-didehydrobenzene (p-benzyne).
Vapor-phase pyrolysis of peroxides yielded a compound, (Z)-2, in high yield, confirming p-benzyne formation.

Conclusions:

The photochemical decomposition of the studied peroxides and 1,4-diiodobenzene in noble gas matrices generates p-benzyne.
IR spectroscopy combined with computational analysis is effective for identifying transient species like p-benzyne.
Pyrolysis provides a complementary method to confirm the formation of reactive intermediates from peroxide precursors.