A unique demo for singlet oxygen?
Admittedly, I'm having a professional photochemical bias when it comes to the generation of singlet oxygen!

A rather safe and simple approach - even in home experiments - is the use of air, sunlight and a sensitizer (rose bengal, methylene blue, or even chlorophyll from natural resources, such as Spirulina).

Here, the sensitizer is irradiated and excited to the first singlet state, undegoes intersystem crossing (ISC) and transfers the energy to ground state triplet oxygen, upon which singlet oxygen is formed:

\begin{align}
\ce{Sens &amp;-&gt;[h\nu]\ ^1Sens^{\ast}}\\
\ce{^1Sens^{\ast} &amp;-&gt;[ISC]\ ^3Sens^{\ast}}\\
\ce{^3Sens^{\ast} +\ ^3O2&amp;-&gt;\ Sens +\ ^1O2}\\
\end{align}

A prominent reaction of $\ce{^1O2}$ is the concerted, diastereoselective addition to 1,3-dienes in Diels-Alder fashion.



A classical example for this reaction is the synthesis of the natural peroxide ascaridole (2) from $\alpha$-terpinene (1). G. O. Schenck, the former director of the Max Planck institute for Radiation Research, performed the reaction in batteries of flasks in his garden and published the results in 1944 (Naturwissenschaften 1944, 32 (14-26), 157–157). Ascaridole is a natural anthelmintic (= against parasitic worms), hence the name. 

Maybe not really suitable for home experiments due to the chromatographic workup envolved but worth to be mentioned is the Schenck ene reaction of allylic alcohols:



The reaction products can be converted to 1,2,4-trioxanes by peroxyacetalization, as shown by Griesbeck and coworkers (Beilstein J. Org. Chem. 2010, 6 (61))



Note that the 1,2,4-trioxane moiety is the key element in the natural anti-malaria drug *artemisinin.