| Summary: | INTISARI
Brominasi pada metil isoeugenol dilakukan pada suhu - 5 °C sampai D °C dalam suasana gas N2 dengan larutan brom dalam CCl4. Diperoleh basil campuran 45,5 % treo dan 545 % eritro 1.2dibromo -1- ( 3,4-dimetoksifenil ) propana dengan titik lebur 90 - 95 °C. Pada basil brominasi diadakan rekristalisasi dengan pelarut tetrahidrofuran (THF) kering ( bebas air ) dan pada analisis proton NMR ditunjukkan campuran 8.8 % treo dan 91,2 % eritro 1,2-dibromo-1-( 3.4 - dimetoksifenil ) propana dengan titik lebur 95 - 96 °C. Hasil percobaan membuktikan bahwa mekanisme brominasi pada mein isoeugenol dapat melewati zat antara ( intermediate ) ion karbonium dan ion bromonium.
Kara kunci : brominasi, suhu. proton NMR_ treo dan eritro.
ABSTRACT
The bromination of methyl isoeugenol was performed by adding a solution of bromine in CCI4. The reaction temperature was varied from - 5 °C to 0 °C in N2 gas atmosphere. A product of the bromination was obtained consisting of 45.5 % threo and 54.5 % erythro of 1.2 - dibromo -1- ( 3,4 - dimethoxyphenyl ) propane mixture (tn. p. 90 - 95 °C ). The products of the bromination was recrystalized by dry tetrahydrofuran ( THF ) and a structure analysis by proton NMR ( ) showed a mixture of 91.2 % erythro and 8.8 % threo of 1,2 - dibromo -1- ( 3,4 - dimethoxyphenyl ) propane
tn. p. 95 - 9b °C ). These products proved that the mechanisms can proceed through intermediate carbonium ion and bromonium ion.
Key words : bromination, temperature. proton NMR, threo and erytro.
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