Synthesis of 2-Alkynoates by Palladium(II)-Catalyzed Oxidative Carbonylation of Terminal Alkynes and Alcohols

A homogeneous PdII catalyst, utilizing a simple and inexpensive amine ligand (TMEDA), allows 2-alkynoates to be prepared in high yields by an oxidative carbonylation of terminal alkynes and alcohols. The catalyst system overcomes many of the limitations of previous palladium carbonylation catalysts. It has an increased substrate scope, avoids large excesses of alcohol substrate and uses a desirable solvent. The catalyst employs oxygen as the terminal oxidant and can be operated under safer gas mixtures.

Electron acoustic soliton energy of the Kadomtsev-Petviashvili equation in the Earth’s magnetotail region at critical ion density

The nonlinear properties of small amplitude electron-acoustic solitary waves (EAWs) in a homogeneous system of unmagnetized collisionless plasma consisted of a cold electron fluid and isothermal ions with two different temperatures obeying Boltzmann type distributions have been investigated. A reductive perturbation method was employed to obtain the Kadomstev-Petviashvili (KP) equation. At the critical ion density, the KP equation is not appropriate for describing the system. Hence, a new set of stretched coordinates
is considered to derive the modified KP equation. Moreover, the solitary solution, soliton energy and the associated electric field at the critical ion density were computed. The present investigation can be of relevance to the electrostatic solitary structures observed in various space plasma environments, such as Earth’s magnetotail region.

Islamismo e terrore: un grande Jihad contro il senso comune (essay)

What implies the conversion to fundamentalist Islam? What are the repercussions and implications of ‘political Islam’ in specific contexts? The relation between Islam, democracy and violence is often represented in a reductive or simplistic way. In order to contribute to a reasoned debate on these pressing questions, this essay covers some key dynamics stemming from long-term ethnographic observation regarding the conversion to neo Salafism among Arab Bedouin citizens in southern Israel, placing them in the context of contemporary developments of Islamic political thought. The ethnographic sensitivity, combined with the voices of some eminent Islamic intellectuals, allows to go beyond both the rhetoric of cultural complexity and the common-sense view that Islamic terrorism would be a kind of ‘anti imperialism of the losers’, arguments employed often to contest emerging neo-orientalist discourses. In this sense, the essay states the need to shed light on coordinates and interpretative categories that are not placed in an essentially different but in often unexpected ways.