Electronic spectra of 1,1,2,3-tetramethyl-3,4-benzo-1,2-disilacyclo-3-pentene and related compounds. stereoelectronic verification of .sigma.-.pi. conjugation between silicon-silicon .sigma. bonds and benzenoid .pi. systems

1972 ◽  
Vol 94 (26) ◽  
pp. 9285-9286 ◽  
Author(s):  
Hideki Sakurai ◽  
Shigeyuki Tasaka ◽  
Mitsuo Kira
Keyword(s):  
Electronic Spectra ◽  
Pi Systems ◽  
Sigma Bonds ◽  
Pi Conjugation ◽  
Related Compounds ◽  
Silicon Silicon

Electronic spectra and electronic structures of [2.2]paracyclophane and related compounds

1973 ◽  
Vol 46 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Suehiro Iwata ◽  
Kiyokazu Fuke ◽  
Michiko Sasaki ◽  
Saburo Nagakura ◽  
Tetsuo Otsubo ◽  
...  
Keyword(s):  
Electronic Spectra ◽  
Electronic Structures ◽  
Related Compounds

Pyridyl enamines and dienamines as models of mycobacterial pigments

1970 ◽  
Vol 23 (10) ◽  
pp. 2109 ◽  
Author(s):  
GM Renwick
Keyword(s):  
Mycobacterium Tuberculosis ◽  
Electronic Spectra ◽  
Dissociation Constants ◽  
Related Compounds

N,N'-Tetramethylformamidinium perchlorate and its higher vinylogue react with 4-picolylsodium to yield 4-(2-dimethylaminovinyl)pyridine (1) and l-dimethyl-amino-4-(4-pyridyl)buta-1,3-diene (3), and with 2-picolylsodium to yield the 2-pyridine isomers (2) and (4). The N.M.R. spectra and dissociation constants of these products are reported. The electronic spectra of the bases, their mono- and di-cations, and of some related compounds are described, and comparisons are drawn with coloured alkaloids which are produced by Mycobacterium tuberculosis in the presence of isonicotinoylhydrazide.

scholarly journals Helical Electronic Transitions of Spiroconjugated Molecules

2021 ◽  
Author(s):  
Marc Hamilton Garner ◽  
Clemence Corminboeuf
Keyword(s):  
Relative Orientation ◽  
Molecular Orbitals ◽  
Electronic Transitions ◽  
Chiroptical Properties ◽  
Pi Systems ◽  
Pi Conjugation ◽  
Symmetry Protected

<div><div><div><div><p>The two pi-systems of allene can mix into helical molecular orbitals (MOs), yet the helicity is lost in the pi-pi∗ transitions. In spiroconjugated molecules the relative orientation of the two π- systems is different as only half the pi-MOs become helical. Consequently, the helicity of the electronic transitions is symmetry protected and thus helical pi-conjugation can manifest in observable electronic and chiroptical properties.</p></div></div></div></div>

Reaction of singlet oxygen with disiliranes: dioxygen insertion into silicon-silicon .sigma. bonds

1993 ◽  
Vol 12 (5) ◽  
pp. 1514-1522 ◽  
Author(s):  
Wataru Ando ◽  
Masahiro Kako ◽  
Takeshi Akasaka ◽  
Shigeru Nagase
Keyword(s):  
Singlet Oxygen ◽  
Sigma Bonds ◽  
Silicon Silicon
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