POLIPIRIDIN KOT TRDNI NOSILEC ZA BROMIRANJE STIRENA

Skrbinšek, Sandi

| | SLO | ENG | Cookies and privacy

Bigger font | Smaller font

First page > Show document

Show document

Title:	POLIPIRIDIN KOT TRDNI NOSILEC ZA BROMIRANJE STIRENA
Authors:	ID Skrbinšek, Sandi (Author) ID Iskra, Jernej (Mentor) More about this mentor... ID Paljevac, Muzafera (Comentor)
Files:	UN_Skrbinsek_Sandi_2015.pdf (1,21 MB) MD5: 896ECBA9190CCC1172B5D42472A28E81
Language:	Slovenian
Work type:	Bachelor thesis/paper
Typology:	2.11 - Undergraduate Thesis
Organization:	FKKT - Faculty of Chemistry and Chemical Engineering
Abstract:	Diplomsko delo prikazuje študijo narave polipiridinskega trdnega nosilca za bromiranje stirena. Ker je oksidativno halogeniranje ena izmed najbolj perspektivnih metod za halogeniranje organskih spojin, smo najprej proučili selektivnost oksidativnega bromiranja stirena s HBr/H2O2 v organskih topilih, kot so diklorometan, metanol, acetonitril z in brez dodatka vode. Izkazalo se je, da je selektivnost reakcije odvisna od vrste topila, saj je v diklorometanu nastal le en produkt, (1,2-dibromoetil)benzen, npr. v metanolu pa so nastali kar trije produkti, poleg (1,2-dibromoetil)benzena še (2-bromo-1-metoksietil)benzen in 2-bromo-1-feniletanol. Nato smo raziskali naravo bromirnega reagenta v reakciji oksidativnega bromiranja tako, da smo primerjali selektivnost bromiranja stirena z različnimi bromirnimi reagenti na polimernem nosilcu, katere smo pripravili iz Br2, HBr3, in HOBr. Opazovali smo obnašanje reakcije v različnih organskih topilih z in brez dodatka vode, določili izkoristke in selektivnost reakcij s pomočjo 1H NMR in FTIR spektroskopije. Ugotovili smo, da obstaja veliko pozitivnih lastnosti uporabe trdnih nosilcev za izvedbo kemijskih reakcij. Sem spadajo enostavnost rokovanja z njimi, saj lahko preprosto zatehtamo željeno količino za reakcijo. Trdni nosilec lahko po končani reakciji enostavno odstranimo iz reakcijske zmesi s filtriranjem, kar pomeni, da lahko reagente na trdnih nosilcih večkrat uporabimo za reakcijo. Reagenti, kot npr. Br2 na trdnih nosilcih so tudi varnejši za uporabo. Brom je namreč toksična, jedka in lahko hapljiva tekočina, ki lahko povzroči nemalo težav.
Keywords:	Trdni nosilci, polimerni reagenti, poli(4-vinil)piridin, bromiranje, oksidativno bromiranje
Place of publishing:	Maribor
Publisher:	[S. Skrbinšek]
Year of publishing:	2015
PID:	20.500.12556/DKUM-54547
UDC:	66.094.414:547.821(043.2)
COBISS.SI-ID:	19438102
NUK URN:	URN:SI:UM:DK:M6NUKKSS
Publication date in DKUM:	21.10.2015
Views:	2520
Downloads:	123
Metadata:
Categories:	KTFMB - FKKT
:	Copy citation

Average score:	(0 votes)
Your score:	Voting is allowed only for logged in users.
Share:

Hover the mouse pointer over a document title to show the abstract or click on the title to get all document metadata.

Secondary language

Language:	English
Title:	POLYPYRIDINE AS A SOLID REAGENT FOR STYRENE BROMINATION
Abstract:	The thesis shows the study on polypyridine brominating reagents for bromination of styrene. Because oxidative halogenation is the most perspective method for organic compound halogenation, we first examined the selictivity of oxidative bromination of styrene with HBr/H2O2 in organic solvents, such as dichloromethane, methanol, acetonitrile with and withouth addition of water. It turned out that the selectivity of the reaction depends on the type of solvent used, because when we used dichloromethane as a solvent we only isolated (1,2-dibromoethyl)benzene, while when using methanol we obtained (1,2-dibromoethyl)benzene, 2-bromo-1-phenyletanon and 2-bromo-1-phenylethanol. In order to study the nature of brominating reagent in oxidative halogenation, we compared the selectivity of bromination of styrene with different polymeric bromination reagents prepared from polypyridine and Br2, HBr3 and HOBr. With them we studied reaction in different organic solvents with and withouth watter, determined the yield of the reaction, with 1H NMR and FTIR we researched the selectivity of the reaction and determined the weight fraction of comounds in the product. We have recognized that there are a lot of positive properties using polymeric reagents for chemical reactions, i.e. the ease of handling with them, because we can easily weigh the desired amount for the reaction. Solid carrier can be easily removed when the reaction is finished through the filtration proces, which means, that we can reuse polymeric reagents over and over again. Reagents as Br2 on polymeric carriers are also safer to use. Bromine is considered a toxic, corrosive and easy volatile substance which could cause a lot of problems.
Keywords:	Solid carrier, polymer reagent, poly(4-vinylpyridine), bromination, oxidative halogenation

Comments

Leave comment

You must log in to leave a comment.

Comments (0)

0 - 0 / 0

There are no comments!

Back