A NEW METHOD OF PREPARING DIBENZOYL ETHYLENE AND RELATED COMPOUNDS

1923 ◽  
Vol 45 (5) ◽  
pp. 1303-1307 ◽  
Author(s):  
James B. Conant ◽  
Robert E. Lutz
Keyword(s):  
1976 ◽  
Vol 7 (29) ◽  
pp. no-no
Author(s):  
A. M. OSMAN ◽  
M. A. EL-MAGHRABY ◽  
K. M. HASSAN

Author(s):  
John J. Horvath ◽  
Manana Gueguetchkeri ◽  
Adarsh Gupta ◽  
Devi Penumatchu ◽  
Howard H. Weetall

1976 ◽  
Vol 7 (3) ◽  
pp. no-no
Author(s):  
J. ROBERT ADAMSON ◽  
ROY BYWOOD ◽  
DAVID T. EASTLICK ◽  
GERARD GALLAGHER ◽  
DEREK WALKER ◽  
...  

Author(s):  
J. Robert Adamson ◽  
Roy Bywood ◽  
David T. Eastlick ◽  
Gerard Gallagher ◽  
Derek Walker ◽  
...  

1991 ◽  
Vol 44 (1) ◽  
pp. 1 ◽  
Author(s):  
MG Banwell

The ring expansion of 7-halogenobicyclo[4.1.0] heptenones and related compounds provides a useful new method for the preparation of the seven-membered conjugated carbocyclic compounds known as tropones and tropolones. This methodology has been exploited in the synthesis of various biologically active troponoid natural products including nezukone, the thujaplicins, thujaplicinol, MY3-469 and colchicine.


1988 ◽  
Vol 61 (7) ◽  
pp. 2401-2404 ◽  
Author(s):  
Hirokazu Naora ◽  
Takashi Ohnuki ◽  
Asao Nakamura

1930 ◽  
Vol 2 (6) ◽  
pp. 357-363 ◽  
Author(s):  
Harold Hibbert ◽  
H. J. Rowley

A description is given of a new method for the isolation from spruce meal of lignin in apparently a relatively unchanged form. The method consists in first extracting the spruce meal with a mixture of equal volumes of benzene and alcohol, followed by an extraction with water. The dried meal is then digested for 6–8 hr. at 110 °C. with 8–10 times its weight of ethylene glycol containing 0.2% of iodine, calculated on the weight of spruce meal taken. The reaction mixture is filtered, and the lignin isolated by pouring the filtrate into a large excess of cold water. Other catalysts such as hydrochloric acid may be used in place of iodine and the glycol may be replaced by a variety of hydroxy-compounds such as glycol mono-ethyl ether, glycerol, chlorhydrins, hydroxyacids, etc.


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