28.
    发明专利
    未知

    公开(公告)号:DE3869314D1

    公开(公告)日:1992-04-23

    申请号:DE3869314

    申请日:1988-09-08

    Applicant: DEGUSSA

    Abstract: Prepn. of alkali metal salts of L-2-pyrrolidone-5-carboxylic acid of formula (I) in which M is an alkali metal, comprises condensn. and cyclisation of alkali metal L-glutamates by heating at temps. between the m.pt. and about 270 deg.C removing water formed in the intramolecular condensn.

Patent Agency Ranking