منابع مشابه
Erythromycin A 11,12-methylene acetal.
Erythromycin A 11,12-methylene acetal (5) and the corresponding 9-methoxime, 9-dihydro, and 8-hydroxy derivatives have been prepared and their antibacterial activities compared with those of erythromycin A and its 11,12-cyclic carbonate. The simple methylene acetal 5 showed excellent activity against Gram-positive organisms in vitro.
متن کاملStudies of acetal phospholipides of brain. I. Procedure of isolation of crystallized acetal phospholipide from brain.
Feulgen and Rossenbeck (1) demonstrated in 1924 in the cytoplasm of cells the presence of substances which give histochemically a color reaction with Schiff’s aldehyde reagent. Feulgen and Voit (2) at the same time showed that the aldehyde group of these substances is not free, but bound in a labile form. The authors called this substance plasmalogen. Feulgen and Bersin (3) succeeded in 1939 in...
متن کاملStudies of Acetal Phospholipides of Brain
Feulgen and Bersin (1) obtained from the hydrolysis products of the acet>al phospholipide present in muscle a mixture of thiosemicarbazones. They suggested that these thiosemicarbazones are derivatives of pahnitic and stearic aldehydes, although t,hey gave no analytical data supporting this view. Anchel and Waelsch (2) obtained from hydrolysates of lipide mixtures from different tissues, includ...
متن کاملSynthesis of novel acetal thia-cage compounds.
The synthesis of novel acetal thia-cage compounds has been accomplished by the direct substitution for the oxygen atom by the sulfur atom in the reaction of the acetal groups of oxa-cages with Lawesson reagent (LR). Reaction of the tetraoxa-cage compound 2 with LR in dichloromethane at 25 degrees C sequentially gave the monothia-, dithia-, trithia-, and tetrathia-cage compounds 3, 6, 7, and 9. ...
متن کاملGold-catalyzed cyclization of allenyl acetal derivatives
The gold-catalyzed transformation of allenyl acetals into 5-alkylidenecyclopent-2-en-1-ones is described. The outcome of our deuterium labeling experiments supports a 1,4-hydride shift of the resulting allyl cationic intermediates because a complete deuterium transfer is observed. We tested the reaction on various acetal substrates bearing a propargyl acetate, giving 4-methoxy-5-alkylidenecyclo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Archiv der Pharmazie
سال: 1858
ISSN: 0365-6233,1521-4184
DOI: 10.1002/ardp.18581440122