Reactions of NHC‐Boranes with Dibenzoyl Peroxide and Benzoic Acid

Daniel A. Bolt; Dennis P. Curran

doi:10.1002/adsc.202000147

Reactions of NHC‐Boranes with Dibenzoyl Peroxide and Benzoic Acid

Advanced Synthesis & Catalysis ◽

10.1002/adsc.202000147 ◽

2020 ◽

Vol 362 (11) ◽

pp. 2238-2244

Author(s):

Daniel A. Bolt ◽

Dennis P. Curran

Keyword(s):

Benzoic Acid ◽

Dibenzoyl Peroxide

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Study on the Supramolecular Interaction of Dibenzoyl Peroxide(BPO) and ß-Cyclodextrin(ß-CD) by Spectrophtometry and its Analytical Application

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.27 ◽

2012 ◽

Vol 554-556 ◽

pp. 27-30

Author(s):

Hui Xie ◽

Yan Min Wang

Keyword(s):

Aqueous Solution ◽

Complex Formation ◽

Benzoic Acid ◽

Supramolecular Interaction ◽

Guest Complex ◽

Host Guest Complex ◽

Molecule Recognition ◽

Excellent Selectivity ◽

Principal Advantage ◽

Dibenzoyl Peroxide

The supramolecular interaction of BPO and ß-CD has been studied by spectrophtometry. The mechanism of the inclusion was studied. The results showed that ß-CD react with BPO to form a 2:1 or 1:1 host-guest complex.The ß-CD reacts with benzoic acid to form a 1:1 host-guest complex after the BPO was reduced by hydroxyl ammonium chloride.Based on the enhancement of the absorbance of BPO produced through complex formation, a spectrophotometric method for determination BPO in bulk aqueous solution in the presence of ß-CD was developed. A linear relationship between the absorbance and BPO concentration was obtained in the range of 0.2～50 μg.ml-1. The proposed method was used to determine the BPO in the flour with satisfactory results. The principal advantage of the proposed method is its excellent selectivity based on molecule recognition of ß-CD and simple.

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TEM characterization of proton-exchanged LiNbO3 optical waveguides

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010014395x ◽

1986 ◽

Vol 44 ◽

pp. 480-481

Author(s):

W. E. Lee

Keyword(s):

Refractive Index ◽

Benzoic Acid ◽

Optical Waveguides ◽

Total Internal Reflection ◽

Index Of Refraction ◽

Optical Measurements ◽

Lithium Ions ◽

Wide Channel ◽

Tem Characterization

An optical waveguide consists of a several-micron wide channel with a slightly different index of refraction than the host substrate; light can be trapped in the channel by total internal reflection.Optical waveguides can be formed from single-crystal LiNbO3 using the proton exhange technique. In this technique, polished specimens are masked with polycrystal1ine chromium in such a way as to leave 3-13 μm wide channels. These are held in benzoic acid at 249°C for 5 minutes allowing protons to exchange for lithium ions within the channels causing an increase in the refractive index of the channel and creating the waveguide. Unfortunately, optical measurements often reveal a loss in waveguiding ability up to several weeks after exchange.

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