Main observation and conclusion A novel and practical method for the synthesis of 3,5‐bis(trifluoromethyl)‐4,5‐dihydro‐1H‐pyrazoles by [3+2] cycloaddition reactions of α‐(trifluoromethyl)styrenes with 2,2,2‐trifluorodiazoethane (CF3CHN2) has been developed. The cyclization reaction proceeds smoothly in the presence of a catalytic amount of Et3N, affording a variety of bis(trifluoromethyl)‐substituted 2‐pyrazolines in good to excellent yields. This method also exhibits a broad substrate scope and tolerates various functional groups.

An efficient method for the synthesis of trans-difluorocyclopropyl boronates and silanes through a Cu-catalyzed hydroborylation and hydrosilylation of difluorocyclopropenes was reported.

A novel ligand-controlled highly regioselective synthesis of CF3-substituted homopropargylboronates and homoallenylboronates via copper-catalyzed 1,2 or 1,4-protoborylation of 2-trifluoromethyl-1,3-conjugated enynes with B2pin2 was developed.

Four unprecedented base-catalyzed/mediated nucleophilic additions of TMSCN to α-(trifluoromethyl)styrenes and 2-trifluoromethyl enynes were developed. The reaction proceeded smoothly at room temperature under mild and transition-metalfree conditions without affecting the trifluoromethyl group and afforded the corresponding CF 3 -containing alkyl, alkynyl, and butadienyl nitriles in moderate to excellent yields in a highly regioselective manner, respectively.

A series of novel analogues of flubendiamide bearing alkoxyhexafluoroisopropyl moiety was synthesized. Their insecticidal activities against various insects were evaluated.