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Study on synthesis of lanthanide chelates of fluorochloroalkyl β‐diketones useful as shift reagents
Author(s) -
WeiYuan Huang,
LongQing Zhang
Publication year - 1985
Publication title -
acta chimica sinica english edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 0256-7660
DOI - 10.1002/cjoc.19850030214
Subject(s) - chemistry , lanthanide , reagent , ether , ketone , chelation , alcohol , solubility , amine gas treating , medicinal chemistry , ethanol , proton nmr , organic chemistry , ion
Several lanthanide chelates of the fluorochloroalkyl β‐diketones Ln(CF 2 ClCOCHCOR) 3 ·nH 2 O were prepared (2, Ln=Eu; 2a, R=C(CH 3 ) 3 , n=0; 2b, R=C 6 F 5 , n=0; 2c, R=CF 2 Cl, n=2. 3, Ln=Pr; 3a, R=C (CH 3 ) 3 , n=0; 3b, R=C 6 F 5 , n=l; 3c, R=CF 2 Cl, n=2. 4, Ln=La, R=C 6 H 5 , n=0) and the NMR shift data of compounds 2 and 3 had been determined using alcohols, ether, ketones and amine as substrates. With alcohol, ether and ketone, compounds 2 induces shifts similar to that induced by Eu (fod) 3 . However due to the high solubility of the chelates in non‐polar organic solvents such as CHCl 3 and CCl 4 and the absence of 1 H signal from compounds 2b and 2c, their application as a series of new 1 H NMR shift reagents seems promising.