Constrained-Geometry Bisphosphazides Derived from 1,8-Diazidonaphthalene: Synthesis, Spectroscopic Characteristics, Structural Features, and Theoretical Investigations
作者:Julius F. Kögel、Nuri C. Abacılar、Felicia Weber、Benjamin Oelkers、Klaus Harms、Borislav Kovačević、Jörg Sundermeyer
DOI:10.1002/chem.201304498
日期:2014.5.12
Attempts to protonate the obtained bisphosphazides and to prove the computationally predicted pKBH+ values through NMR titration reactions resulted in their decay, which again was rationalized by theoretical calculations. Altogether we present the so far most extensive spectroscopic, structural and theoretical investigation of constrained geometry bisphosphazides and their Brønsted and Lewis basic properties
HUSSAIN, L. ALTAF;ELIAS, ANIL J.;SUDHEENDRA, RAO M. N., TETRAHEDRON LETT., 29,(1988) N 46, C. 5983-5986
作者:HUSSAIN, L. ALTAF、ELIAS, ANIL J.、SUDHEENDRA, RAO M. N.
DOI:——
日期:——
Mono‐Phosphazenyl Phosphines (R
<sub>2</sub>
N)
<sub>3</sub>
P=N–P(NR
<sub>2</sub>
)
<sub>2</sub>
– Strong P‐Bases, P‐Donors, and P‐Nucleophiles for the Construction of Chelates
作者:Julius F. Kögel、Sebastian Ullrich、Borislav Kovačević、Sebastian Wagner、Jörg Sundermeyer
DOI:10.1002/zaac.202000108
日期:2020.7.15
We present a convenient three‐step synthesis of amino substituted phosphazenyl phosphines of the general formula (R2N)3P=N–P(NR2)2 [NR2 = N(CH2)4, N(CH2)5, N(CH2)6]. These easily accessible mixedvalentcompounds display a surprisingly high proton affinity and basicity in the same range as the corresponding Schwesinger diphosphazene (Me2N)3P=N–P=NEt(NMe2)2 (Et‐P2) and Verkade's proazaphosphatrane superbases
我们提出了通式(R 2 N)3 P = N–P(NR 2)2 [NR 2 = N(CH 2)4,N(CH 2)5的氨基取代的磷腈基膦的便捷三步合成方法,N(CH 2)6 ]。这些容易获得的混合价化合物在与相应的Schwesinger二磷腈(Me 2 N)3 P = N–P = NEt(NMe 2)2(Et-P 2)和Verkade的proazaphosphatrane超级碱基。在中心的[P III –N = P V ]支架中,膦P III而不是磷腈N III原子是质子亲和性,碱度和供体强度最高的中心。作为P-碱,标题化合物的计算出的质子亲和力在265.8(NR 2 = NMe 2)和274.7 kcal · mol –1 [NR 2 = N(CH 2)4 ]之间,p K BH +值在26.4(NR 2 = NMe 2)和31.5 [NR 2 = N(CH 2)4 ]在乙腈刻度上。作为P-亲
A convenient and high yield synthesis of tertiary (amino) phosphines by transamination route
作者:L.Altaf Hussain、Anil J. Elias、M.N.Sudheendra Rao
DOI:10.1016/s0040-4039(00)82246-7
日期:1988.1
Tris (diethylamino)phosphine affords tertiary (amino) phosphines of pyrrolidine, piperidine, hexamethyleneimine, morpholine and N-methylpiperazine in nearly quantitative yields by transamination route - an easy and convenient synthesis occuring under mild conditions.