Thiocarbohydrazide derivatives act as stabilizers when processing photographic materials in the conventional black and white developers of the type used as first developer in color reversal processes. Furthermore, they can promote the development of color in the second developer in color reversal processes in such a way that a second exposure or fogging baths may be dispensed.
Synthesis of new 4-oxo-thiazolidine-5-ylidenes of antitumor and antioxidant activities
作者:Ashraf A. Aly、Alan B. Brown、Mohamed Abdel-Aziz、Gamal El-Din A. A. Abuo-Rahma、Mohamed F. Radwan、Mohamed Ramadan、Amira M. Gamal-Eldeen
DOI:10.1002/jhet.290
日期:——
Abstractmagnified image Reaction of diacyl thiocarbohydrazides with dimethyl but‐2‐ynedioate in refluxing ethanol led to 4‐oxa‐thiazolidine‐5‐ylidene‐acetates in good yields. Reaction of the newly prepared N‐(2‐(propan‐2‐ylidene) hydrazine‐carbonothioyl)arylhydrazides with dimethyl but‐2‐ynedioate gave the corresponding (Z)‐methyl‐2‐arylhydrazide‐4‐oxo‐3‐(propan‐2‐ylideneamino)thiazolidine‐5‐ylidene)‐acetates. The mechanism is discussed. Antitumor and antioxidant activities have been also investigated. J. Heterocyclic Chem., (2010).
Phase-Transfer Catalyzed Mild Synthesis of 1,5-Diacyl Thiocarbohydrazides and Their Solventless Expeditious Transformation to 1,5-Diacyl Carbohydrazides
作者:Zheng Li、Yanlong Zhao、Jingya Yang
DOI:10.1080/10426500600867240
日期:2007.1.1
1,5-diacyl thiocarbohydrazides were efficiently synthesized by the reactions of thiocarbohydrazide with a variety of aroyl chlorides at r.t. using PEG-400 as a phase-transfer catalyst. Meanwhile, 1,5-diacyl thiocarbohydrazides were be expeditiously transformed into corresponding 1,5-diacyl carbohydrazides with periodic acid by r.t. grinding a under solventless condition. This protocol has advantages