Phosphonium salts of N-phosphonomethylglycine, preparation and compositions thereof and the use thereof as herbicides and plant growth regulants
申请人:STAUFFER CHEMICAL COMPANY
公开号:EP0073574A1
公开(公告)日:1983-03-09
A compound characterised in that it consists essentially of a phosphonium cation and a glycylmethyl phosphonate anion is disclosed.
More particularly, such compounds correspond to the following general formula (I):
wherein
R1, R2, R3 and R4 independently represent C1-C10 alkyl, optionally substituted benzyl or optionally substituted phenyl, the substituents being selected from halogen C1-C4 alkoxy and C1-C4 alkyl, provided that at least one or R1, R2. R3 and R4 represents optionally substituted benzyl or substituted phenyl;
or to the following general formula (II):
wherein
R1, R2, R3 and R4 independently represent C1-C10 alkyl or phenyl.
Sucn compounds may be used as herbicides and plant growth regulants.
The present study describes a rapid synthesis method for labeled [C-11]FK506 for positron emission tomography (PET). A one-pot reaction from [C-11]CH3I, involving a Wittig reaction as the key carbon-carbon bond formation was developed. The chemical process was accomplished using a designed, fully automated synthetic apparatus, and an injectable solution of [C-11]FK506 was obtained in only 34 min from [C-11]CH3I. The decay-corrected radiochemical yield based on [C-11]CH3I was 11.9%, and the specific activity was 39.8 GBq/mumol. (C) 2003 Elsevier Science Ltd. All rights reserved.