asymmetric coupling
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Photonics ◽  
2022 ◽  
Vol 9 (1) ◽  
pp. 28
Author(s):  
Bin-Kai Liao ◽  
Chin-Hao Tseng ◽  
Yu-Chen Chu ◽  
Sheng-Kwang Hwang

This study investigates the effects of asymmetric coupling strength on nonlinear dynamics of two mutually long-delay-coupled semiconductor lasers through both experimental and numerical efforts. Dynamical maps and spectral features of dynamical states are analyzed as a function of the coupling strength and detuning frequency for a fixed coupling delay time. Symmetry in the coupling strength of the two lasers, in general, symmetrizes their dynamical behaviors and the corresponding spectral features. Slight to moderate asymmetry in the coupling strength moderately changes their dynamical behaviors from the ones when the coupling strength is symmetric, but does not break the symmetry of their dynamical behaviors and the corresponding spectral features. High asymmetry in the coupling strength not only strongly changes their dynamical behaviors from the ones when the coupling strength is symmetric, but also breaks the symmetry of their dynamical behaviors and the corresponding spectral features. Evolution of the dynamical behaviors from symmetry to asymmetry between the two lasers is identified. Experimental observations and numerical predictions agree not only qualitatively to a high extent but also quantitatively to a moderate extent.


ACS Catalysis ◽  
2021 ◽  
pp. 6643-6655
Author(s):  
Jingzhao Xia ◽  
Takahiro Hirai ◽  
Shoichiro Katayama ◽  
Haruki Nagae ◽  
Wanbin Zhang ◽  
...  

2021 ◽  
Author(s):  
Shiqin Liu ◽  
Ning Jiang ◽  
Yiqun Zhang ◽  
Anke Zhao ◽  
Jiafa Peng ◽  
...  

2021 ◽  
Author(s):  
Choon-Hong Tan ◽  
Xu Ban ◽  
Yifan Fan ◽  
Tuan-Khoa Kha ◽  
Richmond Lee ◽  
...  

Abstract The stereoselective construction of vicinal all-carbon quaternary stereocenters has long been a formidable synthetic challenge. Direct asymmetric coupling of a tertiary carbon nucleophile with a tertiary carbon electrophile is the most straightforward approach but it is sterically and energetically disfavored. Herein, we described a catalytic asymmetric substitution, where racemic tertiary bromides directly couple with racemic secondary or tertiary carbanion, creating a series of congested carbon (sp3)-carbon(sp3) bonds, including isolated all-carbon quaternary stereocenters, vicinal tertiary/all-carbon quaternary stereocenters and vicinal all-carbon quaternary stereocenters. This double stereoconvergent process, using pentanidium as catalyst, affords substituted products in good enantioselectivities and diastereoselectivities.


2021 ◽  
Author(s):  
Fu-Dong Lu ◽  
Jun Chen ◽  
Xuan Jiang ◽  
Jia-Rong Chen ◽  
Liang-Qiu Lu ◽  
...  

The advances on transition-metal catalysed asymmetric couplings with light intervention in recent years was summarized in this review. In order to better meet the needs of modern chemistry, further research outlook was also proposed.


2021 ◽  
Author(s):  
Shu-Pei Yuan ◽  
Xia-Yan Zhang ◽  
Yun-Qing Jia ◽  
Zhen-Hua Wang ◽  
Jian-Qiang Zhao ◽  
...  

An efficient catalytic asymmetric coupling of vinylogous species was developed for the synthesis of enantioenriched sec-alkyl-3-substituted indoles containing adjacent quaternary-tertiary stereocenters in synthetically viable results.


Author(s):  
Xiao‐Yang Dong ◽  
Tian‐Ya Zhan ◽  
Sheng‐Peng Jiang ◽  
Xiao‐Dong Liu ◽  
Liu Ye ◽  
...  

2020 ◽  
Author(s):  
Xiao‐Yang Dong ◽  
Tian‐Ya Zhan ◽  
Sheng‐Peng Jiang ◽  
Xiao‐Dong Liu ◽  
Liu Ye ◽  
...  

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