Tetrakis(triphenylphosphine)platinum(0) (Pt(PPh 3 ) 4 ) in the presence of aromatic thiols exhibits an excellent catalytic activity toward the carbonylative lactonization of 5-hydroxy-1-pentyne with carbon monoxide, which provides α-methylene-δ-lactone in good yield.
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Ogawa et al. (1998) studied this question.
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