Reza, Annisa IndahBalatif, NurJasril2016-05-022016-05-022016-05-02wahyu sari yenihttp://repository.unri.ac.id/xmlui/handle/123456789/8321Pirazoline derivatives, 5-(2-bromophenyl)-3-(naphthalenyl)-4,5-dihydro-1H-pyrazole was synthesized through cyclization reaction between chalcone (E)-3-(2-bromophenyl)-1-(naphthalenyl)prop-2-enon and hydrazine hydrate using acetic acid glacial as catalyst under microwave irradiation. Its strucure was characterized using spectroscopy UV, IR, 1H-NMR, 13C-NMR and MS. Compound showed yield of 71.94%. The 1H-NMR spectrum showed the characteristic of HA, HB, Hx protons in pyrazoline at δ 3,11; 3,86; and 5,33 ppm respectively.en2-Pyrazolinechalconehydrazine hydratemicrowave irradiationstudent Paper Post Degree