Patent · US Expired

Preparation of polymorphically pure terfenadine

US4742175A · kind A · utility

41Cited by
1References
11Claims
0Family size

Assignee

Inventors

Key dates

Filing dateJun 30, 1987
Grant dateMay 3, 1988
Priority date—
Expiry dateJun 30, 2007

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC07D211/22
  • WIPO fieldOrganic fine chemistry
  • WIPO sectorChemistry

Abstract

Polymorphically pure terfenadine, 1-(p-tert-butylphenyl)-4-[4'-(.alpha.-hydroxydiphenylmethyl)-1'-piperidiny l]-butanol, is prepared by carefully controlled recrystallization methods.

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