Bromo ketene dithioacetals (5) were prepared in high yields by reaction of α,α-diacetyl ketene dithioacetals (4) with bromine catalyzed by FeBr 3 at room temperature. This new reaction is proposed involving an ipso ...Bromo ketene dithioacetals (5) were prepared in high yields by reaction of α,α-diacetyl ketene dithioacetals (4) with bromine catalyzed by FeBr 3 at room temperature. This new reaction is proposed involving an ipso electrophilic addition-deacetylation mechanism.展开更多
A novel bromination method for α-H in alkylbenzenes using KBrO3/NaHSO3 as bromination agent and under an incandescent light illumination is reported. The method has advantages of mild reaction condition, simple opera...A novel bromination method for α-H in alkylbenzenes using KBrO3/NaHSO3 as bromination agent and under an incandescent light illumination is reported. The method has advantages of mild reaction condition, simple operation, high utilization of bromine and avoidance of the erosive HBr gas. For some alkylbenzenes, especially some alkylbenzenes with a second substituent in benzene ring, the method provides brominated products of high yield and purity only at temperature usually of 5055 ℃ under light illumination.展开更多
文摘Bromo ketene dithioacetals (5) were prepared in high yields by reaction of α,α-diacetyl ketene dithioacetals (4) with bromine catalyzed by FeBr 3 at room temperature. This new reaction is proposed involving an ipso electrophilic addition-deacetylation mechanism.
文摘A novel bromination method for α-H in alkylbenzenes using KBrO3/NaHSO3 as bromination agent and under an incandescent light illumination is reported. The method has advantages of mild reaction condition, simple operation, high utilization of bromine and avoidance of the erosive HBr gas. For some alkylbenzenes, especially some alkylbenzenes with a second substituent in benzene ring, the method provides brominated products of high yield and purity only at temperature usually of 5055 ℃ under light illumination.
