sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride T=40°C; 4 h; or AsPh4Cl;

sodium hydroxide; tetraphenyl arsonium chloride T=40°C; 4 h;

sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride in water When a 1:1 mixture with 2,3-dimethylbut-2-ene was treated with a deficiency of bromoform under phase transfer conditions, a 1:26 mixture of cyclopropanated product (8) from the olefin and ethyl 4,4,4-tribromo-butanoate was formed.; Product distribution;

sodium hydroxide; N-benzyl-N,N,N-triethylammonium chloride in water When a 1:1 mixture with diethyl ethylidenemalonate was treated with a deficiency of bromoform under phase transfer conditions, a 1:2 mixture of cyclopropanated product from the malonate and ethyl 4,4,4-tribromo-butanoate was formed.; Product distribution;