Conversions of primary amines to azides by n-butyllithium and azidotris(diethylamino)phosphonium bromide
作者:Stephen P Klump、Harold Shechter
DOI:10.1016/s0040-4039(02)01444-2
日期:2002.11
Lithium derivatives of varied aromatic, heterocyclic, aliphatic, and alicyclic primaryamines react efficiently with azidotris(diethylamino)phosphonium bromide in THF at low temperatures to give azides, lithium bromide, nitrogen, and tris(diethylamino)phosphorimine.
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
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
Syntheses and spectroscopic studies of 1,8-bistriazolylnaphthalenes
The first 1,8-diheterocyclicnaphthalenes, the 1,8-bis(1′H-1′,2′,3′-triazolyl)naphthalenes (1a–i), have been synthesized by 1,3-dipolar cycloadditions of 1,8-diazidonaphthalene to acetylenic esters or enolates of acetoacetic esters, and have strained structures as revealed by comparison of their spectral properties with those of the corresponding 1-(1′H-1′,2′,3′-triazolyl)naphthalenes.
N.m.r. spectroscopic ldentification of benz[cd]indazole
作者:Hiroshi Nakanishi、Akira Yabe、Koichi Honda
DOI:10.1039/c39820000086
日期:——
Benz[cd]indazole (1), prepared by the low-temperature photolysis of 1,8-diazidonaphthalene (2) has been identified by 15N, 1H, and 13C. n.m.r. spectroscopy.
通过15 N,1 H和13 C. nmr光谱鉴定了通过1,8-二叠氮萘(2)的低温光解制备的苯并[ cd ]吲唑(1)。