Let's take the conjugated alkyne chain (e) below, taken from Wikipedia:
How would one typically go about synthesising such a conjugated chain with a series of alkyne functions?
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A carbenoid Fritsch-Buttenberg-Wiechell (FBW) rearrangement of a substituted dibromoolefinic precursor is used to generate a lithium acetylide, and subsequent trapping with carbon-based electrophiles provides a wide range of di- and triynes. The lithium acetylide formed from the FBW reaction can also undergo transmetalation to provide zinc, copper, tin, or platinum acetylides . The paper described the preparation of poly-ynes of up to 6 triple bond units.
Image source: organic-chemistry.org