cas 125-72-4, LEVORPHANOL TARTRATE NARCOTIC ANALGESIC

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METHODS FOR PREPARING LEVORPHANOL AND RELATED COMPOUNDS, AND COMPOSITIONS THEREOF
A method for producing substantially pure levorphanol and related compounds, when compared to the conventional process, is provided. In particular, a method for producing substantially pure levorphanol tartrate dihydrate is described. Also described are compositions comprising levorphanol and related compounds, particularly compositions comprising levorphanol tartrate dihydrate, levomethorphan, and norlevorphanol in which the levomethorphan and norlevorphanol are present in the composition in reduced levels.
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Paragraph 0177-0182

(2020/04/29)

PROCESS FOR THE PRODUCTION OF LEVORPHANOL AND RELATED COMPOUNDS
A process for the production of morphinans with higher purity and yield, when compared to the conventional process, is described. Specifically, the process may be used to prepare levorphanol, levorphanol tartrate, and levorphanol tartrate dihydrate in high yields and substantially free from several process impurities.
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Page/Page column 5-8

(2008/06/13)