Patent ID: 7741524

Claim:
A process for preparing one or more iodinated organic substances having a molecular mass of less than 2000 (substances (S)) using: (A) at least one free-radical-generating substance chosen from peroxides, diazo compounds, dialkyldiphenylalkanes, substances derived from tetraphenylethane, boranes and iniferter substances comprising at least one thiuram disulphide group, (B) at least one organic substance comprising at least one ethylenic double bond, capable of adding a free radical to its ethylenic double bond, (C) molecular iodine, which comprises: (1) introducing at least a fraction of (A), at least a fraction of (B) and at least a fraction of (C) into a reactor, then (2) causing the contents of the reactor to react, while introducing therein the possible remainder of (A), the possible remainder of (B) and the possible remainder of (C), until the reactor comprises a mixture comprising one or more substances (S) [mixture (M)], and then either the contents of the reactor are caused to react until the quantity of (B) consumed by the reaction no longer changes (variant (1)), or the reaction in progress is stopped (variant (2)), to produce said one or more iodinated organic substances having a molecular mass of less than 2000, wherein in variant (1), the number of moles of (C) introduced into the reactor expressed relative to the number of moles of (A) introduced into the reactor is greater than or equal to 90% and less than 200% and the number of moles of (C) introduced into the reactor expressed relative to the number of moles of (B) introduced into the reactor is more than 0.5% and less than 200%, wherein in variant (2) the number of moles of (C) introduced into the reactor expressed relative to the number of moles of (A) introduced into the reactor is greater than or equal to 20% and less than 100% and the number of moles of (C) introduced into the reactor expressed relative to the number of moles (B) introduced into the reactor is greater than or equal to 0.01% and less than 5%, and wherein the at least one organic substance comprising at least one ethylenic double bond, capable of adding a free radical to its ethylenic double bond, is at least one compound corresponding to the formula: CΨ 2 =CΨΞ where the Ψ symbols represent, independently of each other and of Ξ, (i) a hydrogen atom, (ii) a halogen atom other than iodine, or (iii) a linear or branched C1-C20 alkyl group; Ξ represents (i) a halogen atom other than iodine, (ii) a phenyl group optionally substituted with one or more atoms chosen from halogen atoms other than iodine and C 1 -C 8 alkyl groups, (iii) —O—C(═O)-Ω, (iv) a nitrile group, (v) —C(═O)—O-Ω or (vi) —C(═O)—N-Ω; and Ω represents (i) a hydrogen atom, or (ii) a saturated or ethylenically unsaturated or aromatic C 1 -C 20 hydrocarbon group.