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[reaction: see text] Several bicyclic compounds bearing a strained 1,2-cyclobutanediol have been prepared from a gamma-bromopropargylic diol under palladium(0) catalysis. The reaction proceeds through a rare unfavored 4-exo-dig cyclocarbopalladation. In some cases, the first reaction is followed by a 6pi-electrocyclization leading to unusual strained tricyclic systems.
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Salem et al. (2003) studied this question.
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