A telomerization process is used to prepare a reaction product containing a noncyclic hydrocarbonoxy-functional polyorganosiloxane. The process includes heating a composition including (A) a cyclic polyorganosiloxane, (B) a silane, and (C) a Lewis Acid telomerization catalyst. The cyclic polyorganosiloxane has formula [(R12SiO)2/2]n, where subscript n is an integer of 4 or more, and each R1 is independently H, a hydrocarbyl group, or a halogenated hydrocarbyl group. The silane has formula R2(4-m)Si(OR3)m, where subscript m is an integer from 1 to 4, each R2 is independently H, a hydrocarbyl group, or a halogenated hydrocarbyl group, and each R3 is independently a hydrocarbyl group. The telomerization catalyst is a Lewis Acid of formula [M]x+[R4SO3−]X where M is a metal atom selected from Aluminum (Al), Bismuth (Bi), Cerium (Ce), Chromium (Cr), Iron (Fe), Gallium (Ga), Indium (In), Lanthanum (La), Scandium (Sc), Samarium (Sm), and Ytterbium (Yb); R4 is selected from an oxygen atom (O) and CF3; and x represents a number up to a maximum valence of the metal atom selected for M.