Starting materials for the design of asymmetrical dandelion dendrimers were synthesized upon the preliminary fixation of suitable amino-alcohols on hexachlorocyclotriphosphazene, N3P3Cl6, as ''blockers''. Further linkage of diamines on solid supports leads to the expected asymmetrical moieties. (C) 1997 Elsevier Science B.V.
to give diastereoisomers containing two different chiral centres, N3P3Cl2[O(CH2)3NH][O(CH2)2NMe] (2–3), which are also trans (2) and cis (3) geometric isomers. Compounds 2 and 3 were reacted separately with another unsymmetrical reagent, N-methyl-1,3-propanediamine, to describe the stereogenic properties of cyclotriphosphazenes combined with threedifferent centres of chirality. The compounds N3P3
Regiochemical Control in the Substitution Reactions of Cyclotriphosphazene Derivatives with Secondary Amines
作者:Serap Beşli、Ceylan Mutlu Balcı、Semih Doğan、Christopher W. Allen
DOI:10.1021/acs.inorgchem.8b01620
日期:2018.10.1
of two different secondary amines with some N3P3Cl4R2 (R2 = OCH2CH2CH2NH, NHPh, NHBut) derivatives lead to the formation of geminal products. We have shown that this observation depends on the electron-donating properties of the PR2 groups. Isolated compounds were analyzed by standard techniques such as elemental analysis, mass spectrometry, and 1H and 31PNMR spectroscopy. The structures of compounds
单螺和双取代环三磷腈衍生物N 3 P 3 Cl 4 R 2(R 2 = OCH 2(CF 2)2 CH 2 O(1a),SPh(1b),OCH 2 CH 2 CH 2 O(1c),NHPh(1d),OCH 2 CH 2 CH 2 NH(1e),NHBu t(1f)))用两种仲胺(吡咯烷和二甲胺)进行了研究,研究了混合取代基环磷腈中的双键或非双键定向作用。从反应混合物的31 P NMR光谱定量确定了同构产物的相对量,即双子叶和非双子叶的顺式或反式。尽管仲胺在与六氯环三磷腈的反应中通常遵循非结构途径,但在这项工作中,两种不同的仲胺与一些N 3 P 3 Cl 4 R 2(R 2 = OCH 2 CH 2 CH 2 NH,NHPh ,NHBu Ť)衍生物会导致双子星产品的形成。我们已经表明,这一观察结果取决于PR 2基团的供电子特性。分离的化合物通过标准技术进行分析,例如元素分析,质谱以及1 H和31
Synthesis and characterization of the first geminal dibenzylaminocyclotriphosphazene derivatives
作者:Serap Beşli、Ceylan Mutlu Balcı、Ceren Köseoğlu、Duygu Palabıyık、Christopher W. Allen
DOI:10.1016/j.ica.2019.04.022
日期:2019.6
N3P3Cl4[NHBut]2 with dibenzlyamine led to formation of bis geminal dibenzylamino derivatives (4d and 4e). The reaction of N3P3Cl4[NHPh]2 was carried out with dibenzylamine at the same mole ratio, leading to the fully substituted product (5c) where four chloride atoms replaced with dibenzylamino groups. The first examples of geminal dibenzylamino cyclotriphosphazene compounds (4d, 4e and 5c) were obtained.
The role of the substituted group on competitive formation of ansa and spiro isomers
作者:Duygu Palabıyık、Ceylan Mutlu Balcı、Serap Beşli
DOI:10.1016/j.ica.2018.11.047
日期:2019.3
the presence of two different bases, NaH and Et3N. The relative amounts of isomeric products, spiro and ansa were established quantitatively from the 31P NMR spectra of the reactionmixtures. The products were separated and characterized by elemental analysis, mass spectrometry, 1H and 31P NMR spectroscopy. Crystal structures of 2b, 3b, 2e and 2f have been characterized by X-ray crystallography. Although
Competitive formation of cis and trans derivatives in the nucleophilic substitution reactions of cyclophosphazenes having a mono-spiro P–NHR group
作者:Serap Beşli、Simon J. Coles、David B. Davies、Adem Kılıç、Elif Okutan、Robert A. Shaw、Esra Tanrıverdi Eçik、Gönül Yenilmez Çiftçi
DOI:10.1039/c1dt10176e
日期:——
derivative of compound 2. For each reaction the relative proportions of cis and trans isomers were determined by 31P NMR measurements of the reaction mixtures. It was found that the reactions of compound 1 with all three alcohols and of compound 2 with methanol lead to exclusive formation of isomers with the substituent cis to the NH moiety, whereas all other reactions lead to mixtures of cis and trans
N 3 P 3 Cl 4 [NH(CH 2)3 NMe](1)和N 3 P 3 Cl 4 [NH(CH 2)3 O](2)与单官能醇的亲核取代反应(甲醇, 2,2,2-三氟乙醇, 苯酚)和仲胺(吡咯烷)被用于研究进入的亲核试剂与具有取代基的产品的比例之间的关系,所述取代基是顺式或反式的螺环NH部分。通过元素分析,质谱,1 H和31 P NMR光谱对反应产物进行表征,并通过X射线晶体学对其进行构型异构体的表征。六种产品的特征是该醇的螺NH基团具有顺式取代基(甲醇, 苯酚)和化合物1和2的吡咯烷衍生物,与仅一个具有取代基的反式为螺环NH基团的衍生物相比,则为化合物2的吡咯烷衍生物。对于每个反应,通过反应混合物的31 P NMR测量确定顺式和反式异构体的相对比例。结果发现,化合物的反应中1与所有三个醇和化合物2与甲醇导致在NH部分带有顺式取代基的异构体排他性形成,而所有其他反应在标准反应条件下导