we describe here a suitable approach for the synthesis of n-unsubstituted monocyclic b-lactams under mild reaction conditions by the annelation of imines with substituted acetylchlorides. in this method the reaily available phtalimidoacetyl chloride were allowed to react with - dibenzylideneiminotoluene (hydrobenzamide) in the presence of an equimolar amount of triethylamine in refluxing toluen...

This article has analyzed principle no.8 of the Constitution from three aspects: 1-verbal analysis 2-conceptual analysis 3-ways to execute this principle. In first section a precise definition of "call to good", "good and evil" (both in law and in jurisprudence) and "government" have been presented. In second section to have a better understanding of principle no.8, issues such as the relation ...

Enjoining good and forbidding evil can be analyzed from various aspects. The present article seeks to explain the relationship between these two duties and the rule of law by relying on complete interpretation of the verses of enjoining good and forbidding evil and the guidelines of infallible figures. The more we adhere to the commandment of the good and the prohibition of the evil, the more w...

in this project, some new polyaspartimides, (pas)s, have been synthesized form michael addition reaction between new synthetic bismaleimide (bmi) and some aromatic diamines. a characteristic property of this polyaspartimides is a pendent carboxylic group, which introduced to these polymers from new bismaleimide. bismaleimides (bmi) is one of the interesting compounds, which can be self-polymeri...

The Iranian textures in the Safavid era are associated with some phenomena such as symbolism and myth. These textures contain some motifs that indicate the beliefs and ideas of the Iranian people, and these motifs have preserved the concepts over time. The dragon is one of these symbolic motifs whose presence can be traced back to the oldest literary sources in Iran's history. Dragon is referre...

a phase-locked loop (pll) based frequency synthesizer is an important circuit that is used in many applications, especially in communication systems such as ethernet receivers, disk drive read/write channels, digital mobile receivers, high-speed memory interfaces, system clock recovery and wireless communication system. other than requiring good signal purity such as low phase noise and low spu...

hedging is a multi-purpose rhetorical strategy which is usually used in scientific arguments to secure ratification of claims, reduce the risk of negation, avoid conflict, manage disagreement and leave room for the audience to assess presented information. hedges are frequently used in research articles to mitigate the findings of research endeavors. the present research aims to investigate the...