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Titan's atmosphere is a natural laboratory for exploring the photochemicalsynthesis of organic molecules. Significant recent advances in the study of theatmosphere of Titan include: (a) detection of C$_3$ molecules: C$_3$H$_6$,CH$_2$CCH$_2$, c-C$_3$H$_2$, and (b) retrieval of C$_6$H$_6$, which is formedprimarily via C$_3$ chemistry, from Cassini-UVIS data. The detection of$c$-C$_3$H$_2$ is of particular significance since ring molecules are of greatastrobiological importance. Using the Caltech/JPL KINETICS code, along with thebest available photochemical rate coefficients and parameterized verticaltransport, we are able to account for the recent observations. It issignificant that ion chemistry, reminiscent of that in the interstellar medium,plays a major role in the production of c-C$_3$H$_2$ above 1000 km.

Vertical distribution of cyclopropenylidene and propadiene in the atmosphere of Titan