SYNTHESIS OF STERICALLY ENCUMBERED TERPHENYLS AND CHARACTERIZATION OFTHEIR METAL DERIVATIVES ET(2)OLIC(6)H(3)-2,6-TRIP(2) AND ME(2)SCUC(6)H(3)-2,6-TRIP(2) (TRIP=2,4,6-I-PR3C6H2-)
B. Schiemenz et Pp. Power, SYNTHESIS OF STERICALLY ENCUMBERED TERPHENYLS AND CHARACTERIZATION OFTHEIR METAL DERIVATIVES ET(2)OLIC(6)H(3)-2,6-TRIP(2) AND ME(2)SCUC(6)H(3)-2,6-TRIP(2) (TRIP=2,4,6-I-PR3C6H2-), Organometallics, 15(3), 1996, pp. 958-964
The synthesis and characterization of sterically encumbered terphenyl
compounds are described. These are 2,6-Dipp(2)C(6)H(3)I (Dipp = 2,6-i-
Pr2C6H3-), 1,2,6-Trip(2)C(6)H(3)I (Trip = 2,4,6-i-Pr3C6H2-), 2, and 1,
3-MesC6H4 (Mes* = 2,4,6-t-Bu(3)C(6)H(2)-), 3, and the solvated metal
derivatives Et(2)OLiC(6)H(3)-2,6-Trip(2), 4, and Me(2)SCuC(6)H(3)-2,6-
Trip(2), 5. They were characterized by H-1 and C-13 NMR spectroscopy a
nd, in the case of 3-5, by X-ray crystallography. The monomeric struct
ures of 4 and 5 and the two-coordinate nature of the metals underline
the very bulky characteristics of these ligands. In addition the isola
tion of 3 rather than the intended iodine derivative 2,6-Mes2C6H3I su
ggests that the synthetic route to the precursor halides can be limite
d by very large ring substituents.