Quantitative preparation of 3,4-di(methylene)tetrahydrothiophene-1,1-dioxide by Zn-induced 1,4-debromination. A valuable 6-C reactive diene in [4+2] cycloadditions with DMAD and [60]fullerene (EN)

Markoulides, M. S. (EN)

Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας (EL)

Markoulides, M. S. (EN)

Optimum reaction conditions for the quantitative preparation of the highly reactive 3,4-di(methylene) tetrahydrothiophene-1,1-dioxide are described. The method involves the zinc-induced 1,4-debromination of 3,4-bis(bromomethyl)-2,5-dihydrothiophene-1,1-dioxide in acetone solvent either by using conventional heating, microwave or ultrasonic irradiation. The [4+2] cycloaddition reaction of 3,4-di(methylene) tetrahydrothiophene-1,1-dioxide with dienophiles such as DMAD and C-60 led to the efficient and clean formation of the corresponding Diels-Alder cycloadducts. Specifically for [60]fullerene, the short-chain C-60 monoadduct was formed in a short reaction time and in high overall yield (56%). In contrast, the iodine-induced 1,4-debromination using KI in toluene, in the presence of 18-crown-6 as a phase transfer catalyst, failed to give the corresponding [4+2] C-60 monoadduct at room temperature or in refluxing toluene and a low product yield (13%) was only obtained at a temperature of 45-50 degrees C. (EN)

diels-alder reaction (EN)

Πανεπιστήμιο Ιωαννίνων

Ιδρυματικό Αποθετήριο Ολυμπιάς

Σχολή Θετικών Επιστημών

Άρθρα σε επιστημονικά περιοδικά ( Ανοικτά)

ΑΠΟΘΕΤΗΡΙΟ "ΟΛΥΜΠΙΑΣ"

Τμήμα Χημείας

Rsc Advances (EN)

Αγγλική γλώσσα

2012

http://olympias.lib.uoi.gr/jspui/handle/123456789/8990

<Go to ISI>://000312148500038

Royal Society of Chemistry (EN)