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- W2075312313 abstract "Abstract Reactions of (η 5 -C 5 H 5 )Re(NO)(PPh 3 )(OTf) and the cyclic amines H NCH 2 CH 2 (C H 2 ) n -4 give adducts [(η 5 -C 5 H 5 )-Re(NO)(PPh 3 )(HNCH 2 CH 2 CH 2 (CH 2 ) n -4 )] + TfO − ; ( 3a-e + TfO − ; n = a , 3; b , 4; c , 5; d , 6; e , 7) in 98-88% yields. Reactions of 3a-e + TfO − and t BuO − K + give the labile amido complexes (η 5 -C 5 H 5 )Re(NO)(PPh 3 ) ( NCH 2 CH 2 CH 2 (C H 2 ) n -4 ) ( 4a-e ), which are characterized in situ at −20°C. Subsequent reactions of 4b-e with Ph 3 C + PF 6 − , and metatheses with NH + 6 , give the cyclic imine complexes [(η 5 -C 5 H 5 )Re(NO)(PPh 3 )(η 1 -NCHCH 2 CH 2 (CH 2 ) n -4 )] + PF 6 − ( 5b-e + PF 6 − ). However, 5d,e + PF 6 − are difficult or impossible to separate from byproducts (up to 30%). In order to circumvent these and other complications, 3a-e + TfO − and NH 4 + PF 6 − are first allowed to react to give 3a-e + PF 6 − (94-76%). Additions of t BuO − K + and then Ph 3 C + PF 6 − give, under carefully optimized conditions, 5b-e + PF 6 − of > 98% purities. All attempts to prepare the three-membered cyclic imine complex 5a + PF 6 − , and phenyl-substituted analogs, are unsuccessful. The IR and NMR properties of the preceding compounds are analyzed in detail." @default.
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- W2075312313 title "Syntheses of cyclic imine complexes of the chiral rhenium Lewis acid [(ν5-C5H5) Re(NO)(PPh3)]+ by hydride ion abstraction from amido complexes" @default.
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- W2075312313 doi "https://doi.org/10.1016/0022-328x(94)80206-8" @default.
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