Aldol condensation is an important organic reaction which leads to the formation of new C-C bond.

羟醛缩合可以形成新的碳-碳键，增长碳链，是一类重要的有机反应。

Aldol condensation is an important organic reaction which leads to the formation of new C - C bond.

羟醛缩合可以形成新的碳 - 碳键,增长碳链,是一类重要的有机反应.

Conclusion:Piperidine shows satisfying effects and deserves further research as a promising catalyst in aldol condensation…

结论：以哌啶为催化剂，经羟醛缩合制备查尔酮类化合物具有一定的优越性，值得进一步深入研究。