Synthesized imine from vanillin and aniline was conducted with solvent-free by adding natural catalyst lime juice (Citrus aurantifolia). This research focused on characterization of imine product using variation of lime juice volume (0.5, 1.0, 1.5, 2.0 and 2.5 mL). Imine product was characterized based on shape, color, melting point and yield. The product was also identified by FITR and GCMS. P1 was e highest yield and purity of imine product were 64.12% and 74.74%, respectively. Physical characterization of imine product was solid form and yellow color with melting point of 150°C.GCMS spectra showed target compound has formed m/z 227 (M *+ ) that referred to 2-metoxy-4-((phenylimino)methyl)phenol. IR spectra confirmed presence of target compound in specific wavelength of imine (C=N) at 1584 cm -1 .Keywords: imine, vanillin, aniline, lime juice, catalyst Sintesis imina dari vanilin dan anilina dapat dilakukan tanpa pelarut dengan bantuan katalis asam alami dari jeruk nipis (Citrus aurantifolia). Penelitian ini bertujuan untuk mengkarakterisasi produk imina dengan variasi volume katalis jeruk nipis. Volume katalis jeruk nipis yang digunakan adalah 0,5; 1,0; 1,5; 2,0; dan 2,5 mL. Produk imina dikarakterisasi berdasarkan bentuk, warna, titik lebur dan rendemen. Produk juga identifikasi menggunakan FTIR dan KG-SM. Sintesis imina menghasilkan P1 sebagai produk terbaik dengan rendemen sebesar 64,12% dan tingkat kemurnian 74,74%. Hasil karakterisasi produk imina berupa padatan yang berwarna kuning dengan titik lebur 150°C. Hasil KG-SM menunjukkan adanya senyawa target sintesis 2-metoksi-4-((fenilimino)metil)fenol pada m/z 227 (M *+ ). Terbentuknya senyawa target diperkuat dengan spektra IR khas senyawa imina (C=N) pada 1584 cm -1 .
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