الفهرس 
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Abstract
The reactions by which bromine adds to ethylenic com- pounds have been investigated and reviewedl-6. Kinetic studies of these reactions showed both a first order and second order in bromine. It has been suggested that in some cases these reactions proceed through a common intermediate since they respond similarly to substituent effects and produce similar ratios of products7. The mechanism and stereochemistry of bromianation of 0(.,;9 -unsaturated esters8-12, of”,B -unsaturated acids13-15, substituted (~)-and (~)-stilbenes16,17, amides13 and ketones13,18-24 in different solvents with various brominating agents have been also studied. The bromination of trans-l,3-diphenyl-2-propenone18,19 ----- I la gave mainly ~£Ythro-2,3-dibromo-l,3-diphenyl-l-propanone 3a as a major product while the £~Eeo-isomer ja is formed at the same time in small amounts which is difficult to isomer could be obtained, however, in a large quantity if the bromination is carried by the addition of hydrogen bromide under controlled conditions to the crystalline £Eans-2-bromo-l,3-diphenyl-2-propenone 2a.