ISSN:
0021-8383
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Ring Opening and Substitution Reactions of 4,4-Dihalo-pyrazolin-5-ones with Nucleophiles1-Aryl-4,4-dihalo-3-methyl-pyrazolin-5-ones (1a-c) undergo ring opening with alkoxides and form alkyl 3-arylazo-2-halo-2-butenoats (2a-d). Analogous reactions take place with ammonia and amines.4-Nitro-phenoxide reacts with substitution of both halogens to the 4,4-bis(4-nitro-phenyl)-compound (5).Phenols are selectively orthobrominated by the title compounds 1a and b.
Additional Material:
2 Tab.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/prac.19843260304
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