1994
DOI: 10.1021/ic00087a011
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Structural and Conformational Studies of Diastereoselected Bis(Phosphino)amines

Abstract: Skeletal P-N-P unit conformational preferences of the unsymmetrically substituted bis(phosphino)amines erythro-¡-PrN[PhP(i-PrNH)][PhP(EtNH)] (4A), meso-and ¿,/-z-PrN[PhP(¡-PrNH)]2 (5A and SB), erythro-i--[PhP(z'-PrNH)] [PhP(z-BuNH)] ( 6), eryZAro-z-PrN[PhP(z-PrNH)][PhP(PhNH)] (7), and eryfAro-i-PrN[PhP-(PhNH)]2 (8) have been examined. Compound 8, newly prepared in this study, and the previously synthesized 4A and 5A have been characterized by X-ray single-crystal analysis: 4A, monoclinic, Pl\/n, a = 10.678(4) … Show more

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Cited by 12 publications
(4 citation statements)
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“…Figure shows the 31 P NMR of 5 in THF- d 8 as a function of temperature. The single resonance at 30 °C (δ( 31 P) = 53.56 ppm) is similar to that of other conformationally averaged, P symmetrical substituted bis(phosphino)amines …”
Section: Resultssupporting
confidence: 64%
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“…Figure shows the 31 P NMR of 5 in THF- d 8 as a function of temperature. The single resonance at 30 °C (δ( 31 P) = 53.56 ppm) is similar to that of other conformationally averaged, P symmetrical substituted bis(phosphino)amines …”
Section: Resultssupporting
confidence: 64%
“…2 J (PNP) coupling constants depend markedly on the conformation of the PNP skeleton. Large positive 2 J (PNP) couplings are associated with the C 2v conformation of 4c , whereas relative small values are observed for C s conformers of 4a . At −100 °C, the line widths of the 31 P signals preclude the detection of such small coupling constants.…”
Section: Resultsmentioning
confidence: 95%
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“…Several theoretical studies have included the H 2 P−NH−PH 2 or H 2 P−CH 2 −PH 2 ligand. Previous experimental work has shown that the lowest-energy conformation of the free Ph 2 P−NR−PPh 2 ligand, R = H or CH 3 , has phosphorus lone pairs pointing away from the R group. However, when the substituent on nitrogen is larger (such as R = i Pr), the increased steric repulsion causes one of the phosphine groups to rotate by 180°.…”
Section: Resultsmentioning
confidence: 99%