scholarly journals CCXVI.—A study of some organic derivatives of tin as regards their relation to the corresponding silicon compounds. Part II. Condensation products of dihydroxydibenzylstannane

1913 ◽  
Vol 103 (0) ◽  
pp. 2034-2050 ◽  
Author(s):  
Thomas Alfred Smith ◽  
Frederic Stanley Kipping
Keyword(s):  
Silicon Compounds ◽  
Condensation Products ◽  
Derivatives Of

Synthetic studies of hydrazine and guanidine: derivatives of 5-pyrazoles

1968 ◽  
Vol 46 (7) ◽  
pp. 1079-1091 ◽  
Author(s):  
Joseph Zauhar ◽  
Benoit F. Ladouceur
Keyword(s):  
Hydrazine Hydrate ◽  
Dimethyl Formamide ◽  
Condensation Products ◽  
Guanidine Derivatives ◽  
Synthetic Studies ◽  
Derivatives Of ◽  
Related Compounds ◽  
Reaction Schemes

The reactions of several substituted 5-chloropyrazoles with hydrazine hydrate and guanidine, respectively, were investigated in ethanol and dimethyl formamide media. In certain cases, only SN2 reactions occurred, while in others the 5-hydrazino- and 5-guanidopyrazoles reacted still further to yield related compounds with two pyrazole rings. On the basis of the intermediates and the different condensation products isolated, reaction schemes are proposed for the reactions discussed.

Use of malonic acid derivatives for the construction of substituted side chains in the position 17β of steroids

1982 ◽  
Vol 47 (4) ◽  
pp. 1240-1251 ◽  
Author(s):  
Pavel Drašar ◽  
Vladimír Pouzar ◽  
Ivan Černý ◽  
Miroslav Havel ◽  
Sofia N. Ananchenko ◽  
...  
Keyword(s):  
Malonic Acid ◽  
Ethyl Cyanoacetate ◽  
Diethyl Malonate ◽  
Side Chain ◽  
Knoevenagel Reaction ◽  
Side Chains ◽  
Condensation Products ◽  
Malonic Acid Derivatives ◽  
Derivatives Of ◽  
Dioxane Ring

Using the Knoevenagel reaction condensation products of 3β-acetoxyandrost-5-en-17-one with diethyl malonate, ethyl cyanoacetate and malononitrile were prepared which converted to derivatives of 3β-hydroxypregn-5-en-21-oic acid. Reductions and oxidations of the double bonds in the positions 5,6 and 17,20 and the stereochemistry at atoms C(17) and C(20) of some derivatives were also investigated. From derivatives of 23,24-dinorchola-5,17(20)-diene-21,22-diol compounds with a 1,3-dioxane ring in the side chain were prepared.

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