Abstract Photochemical addition of methanol to 1, 2, 3, 6-tetrahydropyridine derivatives Ia, Ib, Id-Ii and III afforded methoxypiperidines IIa-IIg and IV as Markovnikov type addition products. Reduction of 4-methyl-1-(2-propenyl) pyridinium bromide with sodium borohydride yielded 4-methyl-1-(2-propenyl)-1, 2, 3, 6-tetrahydropyridine (Ig).