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, or para to X; X is either bromine or iodine; A is a single bond or a group with a continuous pi electron system conjugated to the aldehyde carbonyl; R3 is any non-interfering ring substituent; and n is 0, 1, 2, 3 or 4; in the presence of copper (I) ion, triphenylphosphine, and palladium chloride to produce a protected ethynyl aromatic aldehyde of formula III: ##STR14##
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