Aztreonam .beta. polymorph with very low residual solvent content
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United States of America Patent
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Nov 18, 2008
Grant Date -
Jan 20, 2005
app pub date -
May 17, 2004
filing date -
May 15, 2003
priority date (Note) -
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Abstract
The invention relates to the .beta. polymorph of Aztreonam, which contains less than 2.5% by weight residual solvent and to a process of making said polymorph. In the process of the invention, a polymorph of Aztreonam is dissolved in an absolute C.sub.1-6 alcohol in the presence of a base to form a solution, an acid is added to the solution, and the solution is stirred efficiently.
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