سنتز مکانگزینی مشتقات وینیلی منو ساکارید های معمولی و بررسی واکنشهای پلیمریزاسیون رادیکالی آنها
First Statement of Responsibility
/رضا شریف زاده
.PUBLICATION, DISTRIBUTION, ETC
Name of Publisher, Distributor, etc.
تبریز: دانشگاه تبریز ، دانشکده شیمی ، گروه شیمی آلی
PHYSICAL DESCRIPTION
Specific Material Designation and Extent of Item
۸۲ص
NOTES PERTAINING TO PUBLICATION, DISTRIBUTION, ETC.
Text of Note
چاپی
CONTENTS NOTE
Text of Note
فاقد اطلاعات کامل
DISSERTATION (THESIS) NOTE
Dissertation or thesis details and type of degree
کارشناسی ارشد
Discipline of degree
شیمی آلی
Date of degree
۱۳۸۲/۰۲/۱۲
Body granting the degree
تبریز: دانشگاه تبریز ، دانشکده شیمی ، گروه شیمی آلی
SUMMARY OR ABSTRACT
Text of Note
در این کار پژوهشی یک سری از منومرهای وینیلی شامل مشتقات گلوکز و گالاکتوز سنتز شده اند .ابتدا گلوکز و گالاکتوز در مرکز آنومری متیله شده و اپیمرهای آلفا و بتا متیل گلوکوپیرانوزید و متیل گالاکتوپیرانوزید بدست می آیند .سپس گروههای هیدروکسی۴ و ۶از متیل آلفا گلوکو پیرانوزید و متیل آلفا گالاکتوپیرانوزید جدا شده و با استفاده از بنزآلدهید در حضور ZnCl۲ طی واکنشی محافظت شده اند .ترکیبات کر بو هیدراتی بدست آمده بوسیله دی بوتیل تین اکسید فعال شده و سپس با آکریل کلرید و متاکریل کلرید در یک واکنش مکان گزین منجر به ترکیبات منو مری وینیلی شد و سپس منومرهای حاصل با استفاده از روش پلیمریزاسیون رادیکالی پلیمریزه شدند .ساختار تمام ترکیبات بدست آمده از طریق روشهای اسپکتروسکوپیIR , ۱H NMR - FTو ۱۳C NMRتعیین شده اند
Text of Note
Synthetic polymers containing sugar branches have attracted considerable interests. They have been the focus of intense research as new materials from the viewpoint of renewable supply in their application as surfactants, in cell-recognition studies, biomedical material, hydrogels and biodegradable compounds. The application of the synthesized polymers has been caused a lot of environmentally pollution and problems. As a result, attempts have been made to solve these problems by including biodegradability into polymers in everyday use through slight modifications of their structures. Biodegradable polymers are a newly emerging field and recently a vast number of biodegradable polymers have been synthesized which are able to degrade through microorganisms and enzymes. Biodegradation is a natural process by which organic chemicals in the environment are converted to simpler compounds, mineralized and redistributed through elemental cycles such as the carbon, nitrogen and sulfur cycles. Biodegradation can only occur within the biosphere as microorganisms play a central role in the biodegradation process. The conjugation of sugars, which have diverse functions in biological systems onto certain structural supports, has attracted much attention because of their potential applications in the biomedical material field. In particular, some normal surfaces have been conjugated onto water-soluble synthetic polymers. In addition to biodegradability their chemical structure and other characteristics properties such as molecular weight and stereo-regularities of glycopolymers could be systematically controlled. Derivatives were synthesized. Firstly, the glucose and galactose were methylated in anomeric center and ?- and ?-methyl glucopyranoside and galactopyranoside epimers were obtained. In this work a series of vinylic monomers containing the protected glucopyranoside and galactopyranoside then the ۴- and ۶- hydroxyl groups of glucopyranoside and galactopyranoside were protected using benzaldehyde in the presence of ZnCl۲. The resulted carbohydrate compounds were activated through stannylene acetal intermediates, then was reacted separately with acryloyl chloride and methacryloyl chloride in a stereoselective reaction to give the vinylic type monomeric compounds. The monomers were polymerized by free radical polymerization and the structure of obtained polymers were confirmed using FT-IR, ۱H NMR and ۱۳C NMR methods