187544-84-9Relevant academic research and scientific papers
Half-sandwich aminorhenium complexes: preparation and regioselective N-versus re-alkylations
Wang, Tein-Fu,Lai, Ching-Yih,Hwu, Chong-Chen,Wen, Yuh-Sheng
, p. 1218 - 1223 (1997)
The aminorhenium complex (CO)2ReNH(CH3)CH2CH2(η 5-C5H4) (3), in which the ligating amino group is connected to the cyclopentadienyl ligand, was prepared by irradiation of (η5-C5H4CH2CH 2NHCH3)Re(CO)3 (2) in THF. Alkylation of the corresponding anion [(CO)2ReN(CH3)CH2CH2(η 5-C5H4)]-Li+ (4) as well as the neutral aminorhenium complex 3 with a variety of electrophiles has been studied. The anion 4 reacted with electrophiles, such as CH3I, CH2=CHCH2Br, C6H5CH2Br, and HC≡CCH2Br, at the nitrogen center to provide (CO)2ReNR(CH3)CH2CH2(η 5-C5H4) (5a-d). However, 4 reacted with electrophiles having a carbonyl group or a nitrile group next to the electrophilic carbon, such as BrCH2-CO2CH3, BrCH2CO2C2H5, and BrCH2CN, to give rhenium alkylation compounds [(CO)2(R)-ReNH(CH3)CH2CH2(η 5-C5H4)]+Br- (7e-g) after protonation. The neutral aminorhenium complex 3 reacted with the electrophiles mentioned above to provide exclusive Re-alkylation compounds 7a-g. The structure of the tetraphenylborate salt of 7c, [(CO)2(C6H5-CH2)ReNH(CH 3)CH2CH2(η5-C5H 4)]+BPh4- (8), has been determined by X-ray diffraction.
