The metal complexes of general formula I
1
in which Hal stands for bromine or iodine and A
1
and A
2
have different meanings, are suitable as contrast media.
Process for the preparation of N-phosphonomethylglycine and derivatives thereof
申请人:Coleman P. James
公开号:US20050054871A1
公开(公告)日:2005-03-10
N-phosphonomethylamines are produced by reaction of an amine substrate with a halomethylphosphonic acid or salt thereof, a hydroxymethylphosphonic acid or salt thereof, or a dehydrated self-ester dimer, trimer or oligomer of hydroxymethylphosphonic acid. Among the products that may be prepared according to the process are N-phosphonomethylaminocarboxylic acids such as (e.g.) glyphosate, N-phosphonomethylaminoalkanols such as (e.g.) hydroxyethlaminomethylphosphonic acid, and N-acylaminomethylphosphonic acids such as (e.g.) N-carbamylaminomethylphosphonic acid. Certain reactions are conducted with a substantial excess of amine reactant in order to drive the conversion while avoiding excessive formation of bis(N-phosphonomethyl)amine by-products. Other reactions use a secondary amine substrate (such as iminodiacetic acid) and can be conducted at substantial equimolar ratios of halomethylaminomethylphosphonic acid or hydroxyaminomethylphosphonic acid to secondary amine reactant without significant formation of bis(phosphonomethyl)amine by-products. Further disclosed is a process for the preparation of hydroxymethylphosphonic acid self-ester dimers, trimers and oligomers by azeotropic dehydration.
Die Metallkomplexe der allgemeinen Formel I worin Hal für Brom oder Iod steht und A1 und A2 unterschiedliche Bedeutung haben sind als Kontrastmittel geeignet.
The metal complexes of general formula I
in which Hal stands for bromine or iodine, and A
1
and A
2
have different meanings, are suitable as contrast media.
通式为I的金属配合物,其中Hal代表溴或碘,而A1和A2具有不同的含义,适用于对比介质。
O,O'-amidomalonate and N,O-amidomalonate platinum complexes
申请人:——
公开号:US20040175387A1
公开(公告)日:2004-09-09
The present invention relates to amidomalonate O,O′—Pt and N,O—Pt chelates and methods of preparing them in essentially pure form.