## Abstract 2‐Alkoxy‐5‐chloromethy1‐1,3,4‐thiadiazoles are prepared by ring closure of 3‐chloroacetyl‐thiocarbazic acid O‐alkyl esters with concentrated sulfuric acid, 2‐alkylthio‐5‐chloro‐methy1‐1,3,4‐thiadiazoles directly from dithiocarbazic acid alkylesters with chloroacetylchloride in benzene i
Arbeiten über Phosphorsäure- und Thiophosphorsäure ester mit einem heterocyclischen Substituenten. 2. Mitteilung. Eine verbesserte Methode zur Herstellung von 1, 3, 4-Oxadiazol-2(3H) onen und von Thio- und Dithiophosphorsäure-O, O-dialkyl-S-[(1, 3, 4-oxadiazol-2(3H)-on-3-yl)-methyl]-estern
✍ Scribed by K. Rüfenacht
- Publisher
- John Wiley and Sons
- Year
- 1972
- Tongue
- German
- Weight
- 306 KB
- Volume
- 55
- Category
- Article
- ISSN
- 0018-019X
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✦ Synopsis
Abstract
Some 1,3,4‐oxadiazol‐2(2__H__)‐ones with aliphatic substituents in 5‐position are prepared in good yields and converted via the 3‐hydroxymethyl derivatives to the corresponding 3‐chloromethyl derivatives which are suitable starting materials for the preparation of insecticidal O,O‐dialkyl‐S‐[(5‐subst.‐1,3,4‐oxidiazol‐2(3__H__)‐one‐3‐yl)‐methyl]‐thiophosphates and dithiophosphates.
📜 SIMILAR VOLUMES
## Abstract Impurities in crude oily dithiocarbazic acid (__2′__‐methoxy)‐ethyl ester causing troubles in the ring closure to __5‐(2′__‐methoxy‐ethylthio)‐1,3,4‐thiadiazol‐__2(3H)__‐one and in succeeding reactions are eliminated by using the crystalline 3‐isopropylidene‐dithiocarbazic acid (__2′__‐