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An L-shaped arrangement of bromine atoms is found in the 2:1 π complex formed by electrophilic bromination of tetraneopentylethene (see below). The reaction stops at this stage, which for the first time allows detection and determination of the thermodynamic parameters by UV spectroscopy of a 2:1 bromine–olefin complex. Theoretical calculations predict an olefin · Br2 · Br2 rather than a Br2 · olefin · Br2 structure.
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Bianchini et al. (1997) studied this question.
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