The reactivity of phosphenium dication [(Ph3P)2C-P-NiPr2](2+), 1(2+), towards pyridine N-oxide (O-py) has been investigated. The resulting oxophosphonium dication [(Ph3P)2C(NiPr2)P(O)(O-py)](2+), 2(2+), was surprisingly stabilized by a less nucleophilic O-py ligand instead of pyridine (py). This compound was then identified as an analogue of the elusive Criegee intermediate as it underwent oxyg...

A graph G is called P3-dominated (P3D) if it satisfies J(x, y) ∪ J ′(x, y) 6= ∅ for every pair (x, y) of vertices at distance 2, where J(x, y) = {u|u ∈ N(x) ∩N(y), N [u] ⊆ N [x]∪N [y]} and J ′(x, y) = {u|u ∈ N(x)∩N(y)| if v ∈ N(u)\(N [x]∪N [y]), then (N(u)∪ N(x) ∪ N(y))\{x, y, v} ⊆ N(v)} for x, y ∈ V (G) at distance 2}. For a noncomplete graph G, the number NC is defined as NC = min{|N(x) ∪ N(y...

..................................................................................................................... 1 Original Articles.......................................................................................................... 2 Abbreviations .............................................................................................................. 3 Introduction ..............

introduction: we aimed to compare apical canal transportation of extracted teeth and two types of simulated resin blocks. materials and methods: mesiobuccal root of extracted maxillary molars, high hardness simulated resin blocks (knoop hardness=40) and low hardness simulated resin blocks (knoop hardness=22) were prepared with k-files using step-back technique (n=15 canals in each group). doubl...

Consuming carbohydrate-rich meals before continuous endurance exercise improves performance, yet few studies have evaluated the ideal preexercise meal for high-intensity intermittent exercise, which is characteristic of many team sports. The authors' purpose was to investigate the effects of low- and high-glycemic-index (GI) meals on metabolism and performance during high-intensity, intermitten...

Boundary conditions for the P(φ) 2 euclidean field theory Annales de l'I. Article numérisé dans le cadre du programme Numérisation de documents anciens mathématiques

In this paper, we give some new characterizations of finite p-nilpotent groups by using the notion of HC-subgroups and extend several recent results. Mathematics Subject Classification (2010). 20D10, 20D20.