Formation of Xanthone Oxime and Related Compounds Using a Combination of tert-Butyl Nitrite and Potassium Hexamethyldisilazide

Heterocycles ◽  
2014 ◽  
Vol 88 (2) ◽  
pp. 1433 ◽  
Author(s):  
Hidetoshi Tokuyama ◽  
Hidetsura Cho ◽  
Yusuke Iwama ◽  
Takahiro Noro ◽  
Kentaro Okano
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1986 ◽  
Vol 51 (12) ◽  
pp. 2214-2218 ◽  
Author(s):  
Takehiko Yamato ◽  
Kazumasa Kobayashi ◽  
Takashi Arimura ◽  
Masashi Tashiro ◽  
Kunitoshi Yoshihira ◽  
...  
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1962 ◽  
Vol 5 (1) ◽  
pp. 54-63 ◽  
Author(s):  
Francis. Sowinski ◽  
Harry L. Yale
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1984 ◽  
Vol 62 (11) ◽  
pp. 2566-2569 ◽  
Author(s):  
Eva M. Campi ◽  
Bryan M. K. Gatehouse ◽  
W. Roy Jackson ◽  
Ian D. Rae ◽  
Margaret G. Wong

The 1H nmr spectra of 1,3-di-tert-butyl-2-methoxybenzenedicarbonyltriphenylphosphinechromium (5) and some related compounds at low temperatures show the presence of two species which interconvert with free energy of activation near 50 kJ mol−1. The species differ in the orientation of the methoxy with respect to the chromium, since the same type of process is observed in a chelate complex in which a phosphinite ligand on chromium is also attached to the arene. Hindered rotation about the arene–chromium axis is not involved. The crystal structure of 5 shows the Ph3P anti to the methoxy and the O-methyl group proximal to chromium.


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