Reference of 1,2-DiiodoethaneIn 2016 ,《Synthesis of a sterically bulky diphosphine synthon and Ru(II) complexes of a cooperative tridentate enamide-diphosphine ligand platform》 was published in Dalton Transactions. The article was written by Annibale, Vincent T.; Ostapowicz, Thomas G.; Westhues, Stefan; Wambach, Truman C.; Fryzuk, Michael D.. The article contains the following contents:
To generate tridentate enamido diphosphine ligand platforms, the authors developed procedures for the preparation of tBu2PCH2CH2P(tBu)I, which involve low temperatures, pentane solvent and addition of 4 equiv of tBuLi to Cl2PCH2CH2PCl2 or 2 equiv of tBuLi to known Cl(tBu)PCH2CH2P(tBu)Cl also at low temperatures in pentane; an alternate method involves the inverse addition of Cl(tBu)PCH2CH2P(tBu)Cl to 2 equiv of tBuLi in pentane at 0°; all of these methods generate good yields of the tetraphosphine dimer (tBu2PCH2CH2P(tBu))2 contaminated by small amounts of tBu2PCH2CH2PtBu2 (dtbpe), which can be conveniently separated by sublimation. Subsequent oxidative cleavage of the P-P bond with I2 or 1,2-diiodoethane gave the desired tBu2PCH2CH2P(tBu)I, which undergoes C-P bond formation when added to 1 equiv of the Li N-2,6-diisopropylphenylenamide of cyclopentylidene imine to generate the HNPP ligand precursor; this species exists as a tautomeric mixture of the corresponding enamine and imine, the ratio of which depends on workup conditions used. This enamine-imine mixture can be used directly to form Ru(II) species either directly with heating to generate the five-coordinate (NPP)RuCl(CO) via loss of H2 or by inclusion of 1 equiv of KOtBu to generate (NPP)RuH(CO). X-ray crystallog. studies confirm that the geometry in the solid state matches the solution spectroscopic data. Subsequent studies of (NPP)RuH(CO) indicate that it reacts with benzaldehyde, benzyl alc., and H2 in a cooperative manner to generate hydride carbonyls that were characterized fully by NMR spectroscopy and x-ray crystallog. In the experiment, the researchers used 1,2-Diiodoethane(cas: 624-73-7Reference of 1,2-Diiodoethane)
1,2-Diiodoethane(cas: 624-73-7) is one of organic iodides. The carbon-iodine bond is weaker than other carbon-halogen bonds due to the poor electronegative nature of the iodine atom. In general, organic iodides are light-sensitive and turn yellow during storage, owing to the formation of iodine. Organic iodides can be alkyl, alkenyl, or alkynyl, and all of them are very reactive toward with many kinds of nucleophiles.Reference of 1,2-Diiodoethane
Referemce:
Iodide – Wikipedia,
Iodide – an overview | ScienceDirect Topics – ScienceDirect.com