1,1,1-Trifluoropropan-2-one and 1,1,1-trifluoropentane-2,4-dione in hydrogen bromide–dibromodifluoromethane; evidence for the formation of α-bromo alcohols
作者:David R. Clark、John Emsley、Frank Hibbert
DOI:10.1039/p29880001107
日期:——
solutions of 1,1,1-trifluoropropan-2-one (TFP) and 1,1,1-trifluoropentane-2,4-dione (TFPD) in the strong acid system HBr–CBr2F2 shows the formation of the 2-bromo alcohol analogues of TFP and TFPD at temperatures below 250 K. In the latter system equilibrium constants for the formation of the bromo alcohol at various temperatures and acid ratios have been measured, from which the enthalpy of formation, ΔH°=–25
在强酸体系HBr–CBr 2 F 2中的1,1,1-三氟丙烷-2-酮(TFP)和1,1,1-三氟戊烷-2,4-二酮(TFPD)溶液的Nmr分析表明形成了在低于250 K的温度下测定TFP和TFPD的2-溴醇类似物。在后一系统中,测量了在各种温度和酸比率下形成溴醇的平衡常数,由此可得出形成焓ΔH ° = –25.2 kJ mol –1,已计算出来。1,1,1,5,5,5-六氟戊烷-2,4-二酮(HFPD)不反应形成溴代醇。