CCXIII.—The system sodium sulphite–sodium hydroxide–water

1925 ◽  
Vol 127 (0) ◽  
pp. 1623-1628 ◽  
Author(s):  
Dalziel Llewellyn Hammick ◽  
John Alexander Currie
1945 ◽  
Vol 37 (12) ◽  
pp. 1186-1188 ◽  
Author(s):  
Ralph A. Morgen ◽  
Robert D. Walker

1956 ◽  
Vol 26 (7) ◽  
pp. 518-523 ◽  
Author(s):  
J.W. Weaver ◽  
Elias Klein ◽  
Beverly G. Webre ◽  
Elsie F. DuPré

1984 ◽  
Vol 62 (10) ◽  
pp. 1922-1925 ◽  
Author(s):  
Laurence M. Harwood ◽  
Leslie C. Hodgkinson ◽  
James K. Sutherland ◽  
Patrick Towers

Condensation of leuco-5-hydroxyquinizarin with aldehydes under Marschalk conditions (sodium hydroxide – water) gives 2-alkyl-5-hydroxyquinizarins with high regioselectivity, while the 3-alkyl compounds are obtained under Lewis conditions (piperidinium acetate – isopropanol). Reaction of the quinone with nitronate anions in methanol yields 2-alkyl derivatives exclusively.


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