Patent · US Expired

Recrystallization processes

US6486315B2 · kind B2 · utility

0Cited by
8References
10Claims
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Assignee

Inventors

Key dates

Filing dateNov 16, 2001
Grant dateNov 26, 2002
Priority date—
Expiry dateNov 16, 2021

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07D223/12
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

Mercaptoalkanoylamino lactam acids are recrystallized by treatment with an agent that minimizes the formation of disulfides. Suitable agents are bismercaptans, phosphine or phosphite reducing agents, zinc metal powder, and sodium hydrosulfite.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.