Synthesis of 1,4-dihydro-2-methyl-4-oxo-nicotinic acid: Ochiai's route failed
摘要:
The synthesis of 1,4-dihydro-2-methyl- and 1,4-dihydro-1,2-dimethyl-4-oxo-nicotinic acids was accomplished following a route other than Ochiai's procedure, which yielded the isomer 1,6-dihydro-2-methyl-6-oxo-nicotinic acid ethyl ester, and not the 4-oxo-derivative, as reported. Analytical data confirmed the identity of the two isomer oxo-nicotinic acids. UV-vis and potentiometric preliminary data showed that AI(III) does not form complexes with 1,6-dihydro-2-methyl-6-oxo-nicotinic acid ethyl ester in solution, as expected, but with 1,4-dihydro-2-methyl-4-oxo-nicotinic acid. (c) 2006 Elsevier Ltd. All rights reserved.
TREATMENT FLUIDS COMPRISING A HYDROXYPYRIDINECARBOXYLIC ACID AND METHODS FOR USE THEREOF
申请人:Halliburton Energy Services, Inc.
公开号:EP2825614B1
公开(公告)日:2018-01-31
A HOLLOW STENT FILLED WITH A THERAPEUTIC AGENT FORMULATION
申请人:Abbott Cardiovascular Systems Inc.
公开号:EP2994174A1
公开(公告)日:2016-03-16
Treatment Fluids Comprising a Hydroxypyridinecarboxylic Acid and Methods for Use Thereof
申请人:HALLIBURTON ENERGY SERVICES, INC.
公开号:US20130269941A1
公开(公告)日:2013-10-17
Treatment fluids can mitigate the occurrence or effects of precipitation in a subterranean formation through complexation of a metal ion therein. Methods for treating a subterranean formation can comprise: providing a treatment fluid comprising a hydroxypyridinecarboxylic acid, a salt thereof, or a tautomer thereof; introducing the treatment fluid into a subterranean formation; and complexing a metal ion in the subterranean formation with the hydroxypyridinecarboxylic acid.
Hollow Stent Filled With A Therapeutic Agent Formulation
申请人:Abbott Cardiovascular Systems Inc.
公开号:US20140330365A1
公开(公告)日:2014-11-06
A composition for loading into a structural element of a stent, where the structural element is defined by a lumen and at least one opening to access the lumen. The composition may comprise a therapeutic agent, and a chelator, a precipitation agent, or a combination thereof. Medical devices, such as stents, with a structural element defined by a lumen and at least one opening to access the lumen, filled with the compositions are also described.