سند قانون : فقہائے اسلام اور مغربى مفکرین کى آراء کا تحقیقى وتنقیدى جائزہ

It is generally agreed that every legal system claims authority, however, the notion of authority is one of the most controversial concepts found in western legal philosophy. There are various distinct problems involved in the notion of authority and the problem of its paradoxes. The first section of the present paper introduces the viewpoints of various western schools of thought and the philosophical analysis of the concept of legitimate authority. The conflict about the concept of legitimate authority reflects their code of life and concept of religions. The second section of the paper presents a study of the origins of the Islamic law as well as the contemporary western legal thoughts in connection with authority. In Islamic law authority-which is at once religious and moral is the will of the Creator which is basic source of Islamic law, however, jurists differentiate between legal and moral values. It concludes with the comparison between Islamic and western notion of authority.

Condensation of Thiols With Amino Esters and Synthesis of Pyridyl Guanidinium Receptors As Self-Assembling Systems for the Investigation of Amino Acids Interactions in Biological Systems

A major part of this thesis comprises synthesis of pyridyl guanidinium carboxylate receptors and investigation of their self-assembling properties. It also describes synthesis of sulfenamides derived from amino esters. Chapter I provides an introduction to supramolecular chemistry, its underlying principles, types of receptors, self-assembling systems, application of supramolecular systems and also brief introduction to organosulfur compounds. Chapter II describes synthesis of pyridyl guanidinium based receptors. Chapter III includes experimental work and spectroscopic data obtained for pyridyl guanidinium based receptors and intermediates involved in their synthesis. Chapter IV describes dimerisation studies of synthesised receptors. Synthesised systems were found to be highly stable dimers in DMSO with dimerisation constants up to 8.1 × 105 M-1 and in 60% H2O/DMSO with a dimerisation constant 24.5 M-1. Chapter V includes synthesis of sulfenyl chlorides and their use in the synthesis of sulfenamides. Spectroscopic data obtained for these compounds is also a part of this chapter. Chapter VI describes general conclusions and future perspectives of the work.