Reactions from simpler alkynes

Comparison of equation (52) with Schemes 10 and 11 suggests diat substitution at C-4 confers substantial benefit in terms of lx>th yield and reaction time. This is most likely a result of a gem-dialkyl effect in which conformations placing the alkene and complexed-alkyne ends of the system in close proximity are rendered endialpically more favorable by increasing substitution on the intervening atoms. The reduced contribution of to AG associated with alkene complexation allows it to better compete with intermolecular side reactions (i.e. trimerization of the otherwise mote reactive alkyne moieties). Hua has made similar observations in simpler systems (equation 53). No stereocontrol at C-4 is available, however, the position being too remote from the reaction centers (equation 54). ... 

Functional groups such as alkynes react the same in complex molecules as they do in simpler structures. The following examples of alkyne reactions were taken from s)mtheses carried out in the research group of E. J. Corey at Harvard University.You can assume that the reactions listed involve only the alkyne, not any of the functional groups present in the molecules. Draw the expected products for the following reactions. 

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