TY - JOUR ID - 53947 TI - Quinolinium bound chromium(VI) reagents for efficient electrophilic aromatic nitration and thiocyanation reactions using sodium nitrate and ammonium thiocyanate JO - Asian Journal of Green Chemistry JA - AJGC LA - en SN - 2588-5839 AU - Kodali, Satish Babu AU - Jakku, Narendar Reddy AU - Kamatala, Chinna Rajanna AU - Yerraguntla, Rajeshwar Rao AU - Elisha, Ivon Chakravarthi AD - Department of Chemistry, Rayalaseema University, Kurnool-518 007 (A.P.) India AD - Department of Chemistry, Osmania University, Hyderabad (T.S)-500007 India AD - Department of Chemistry, Govt. City College, Hyderabad-500002 (T.S.) India Y1 - 2018 PY - 2018 VL - 2 IS - 1 SP - 70 EP - 84 KW - Quinolinium chlorochromate KW - Quinolinium dichromate KW - NaNO2/KHSO4 KW - Nitration KW - NH4SCN/KHSO4 DO - 10.22631/ajgc.2017.101557.1031 N2 - Quinolinium dichromate (QDC) and quinolinium chlorochromate (QCC) were studied as efficient reagents for electrophilic aromatic nitration using sodium nitrite and thiocyanation  by using ammonium thiocyanate under conventional, ultrasonic and solvent-free microwave assisted conditions. The microwave-assisted protocols exhibited remarkable rate acceleration and offered selective thiocyanation of the aromatic and heteroaromatic compounds with good yields. Addition of anionic (SDS) micelle to the reaction medium afforded considerable rate enhancements, while cationic (CTAB) and nonionic (Tx-100) micelles did not affect the rate noticeably. These protocols have were extended to regioselective thiocyanation of various aromatic compounds. Results were are completely similar to the nitration protocols. However, the reactions revealed comparatively shorter reaction times, and better yields in nitration reactions than in thiocyanation protocols. Catalytic effect of the SDS was attributed to the electrostatic stabilization of the cationic electrophile (NO2+ in nitration, and SCN+ in thiocyanation). UR - https://www.ajgreenchem.com/article_53947.html L1 - https://www.ajgreenchem.com/article_53947_fafa764c3e31e4ce28ada80161d91cf9.pdf ER -