Zweifach und dreifach intramolekular verbrückte p‐tert‐Butylcalix[8]aren‐triphosphate – Synthese,Struktur und Stereochemie

Two‐ and Threefold Intramolecular Brigdging p‐tert‐Butylcalix[8]arene Triphosphates – Synthesis, Structure and Stereochemistry [1] The phosphorylation of p‐tert‐butylcalix[8]arene ( 1 ) with phosphorus pentachloride and hydrolysis gives intramolecular bridging tert‐butylcalix[8]arene triphosphates. The reactivity (esterification, dehydratisation, complexation), the structure (nmr and x‐ray), and the stereochemical behaviour of the phosphates will be discussed.     

1H, 13C, 31P, 15N, 17O-NMR Investigations of α-Sub-Stituted Aminophosphonates

Abstract

The reaction of aminomethanephosphonates 1 with dimctnylsulfate in dioxan leads to the crystalline methosulfates 2 (1). Deprotonation of the salts 2 with aqueous potassiun carbonate solution gives the very stable N-ylides 3 (1).     

Association patterns of platinated purine nucleobases in metal-modified pairs and triples

Blocking of Watson-Crick or Hoogsteen edges in purine nucleobases by a metal entity precludes involvement of these sites in interbase hydrogen bonding, thereby leaving the respective other edge or the sugar edge as potential H bonding sites. In mixed guanine, adenine complexes of trans-a2PtII (a = NH3 or CH3NH2) of composition trans-[(NH3)2Pt(9-EtA-N1)(9-MeGH-N7)](NO3)2 (1a), trans-[(NH3)2Pt(9-EtA-N1)(9-MeGH-N7)](ClO4)2 (1b), and trans,trans-[(CH3NH2)2(9-MeGH-N7)Pt(N1-9-MeA-N7)Pt(9-MeGH-N7)(CH3NH2)2](ClO4)4*2H2O (2) (with 9-EtA = 9-ethyladenine, 9-MeA= 9-methyladenine, 9-MeGH = 9-methylguanine), this aspect is studied. Thus, in 1b pairing of two adenine ligands via Hoogsteen edges and in 2 pairing of two guanine bases via sugar edges is realized. These situations are compared with those found in a series of related complexes.     

31P and 13C NMR Investigations of a Tert Butylcalix[4]Arene-Diphosphate

Abstract

The lanthanide induced ³¹P and ¹³C shifts for calix[4]arenediphosphate 1 are studied. From these investigations an exact assignment of all the 48 C atoms was possible.     

New Bisphosphonates,Synthesis and Reactions

Abstract

The synthesis and reactions of new bisphosphonates with different substituents in α-position as well as a new type of trisphosphonate are described.     

Derivate des Phosphorsäure-o-phenylenesters. 22. Zur Reaktion von Pv-Halogeniden mit PIII-Halogeniden

Derivatives of o-Phenylene Phosphates. 22. Reactions of P^v-Halides with P^III-Halides Catechyl phosphorous tribromide 1 , catechyl phosphorus trichloride 2 and phosphorus pentachloride 3 react with P^III-halides by ligand exchange at room temperature already.