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Synthesis of Dendritic, Non-Kekul-, and Nondisjoint-Type

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Synthesis of Dendritic, Non-Kekul-, and Nondisjoint-Type Polymer Journal, Vol. 37, No. 4, pp. 284–293 (2005) Synthesis of Dendritic, Non-Kekule´-, and Nondisjoint-type Triphenylmethanes Terminated with Galvinoxyl Radicals Eiji FUKUZAKI,1 Naoki TAKAHASHI,1 Shingo IMAI,1 y yy Hiroyuki NISHIDE,1; and Andrzej RAJCA2; 1Department of Applied Chemistry, Waseda University, Tokyo 169-8555, Japan 2Department of Chemistry, University of Nebraska, Lincoln, NE 68588-0304, U.S.A. (Received November 8, 2004; Accepted December 24, 2004; Published April 15, 2005) ABSTRACT: A series of triphenylmethanes terminated with (a) hydrogalvinoxyl(s), bis(4-tert-butylphenyl)-(4- hydrogalvinoxylphenyl)methoxymethane 1ad, tris(4-hydrogalvinoxylphenyl)methoxymethane 2ad, and tris{4-[bis(4- hydrogalvinoxylphenyl)methoxymethyl]phenyl}methoxymethane 3ad, were prepared and oxidized to the correspond- ing galvinoxyl radicals, 1af, 2af, and 3af, which have one, three, and six galvinoxyl radical(s), respectively. Chemical reduction of the galvinoxyl radicals with a Na/K alloy gave stable intermediates, i.e., the tetraanion, decaanion, and docosaanion. The tetraanion was oxidized with an equimolar amount of iodine at ca. 170 K to the galvinoxyl radi- cal-combined triphenylmethyl radical 1cf. The ESR signal of the biradical at room temperature indicated an exchange interaction between the two radicals. The spectrum at 140 K had a zero-field splitting and ÁMS ¼Æ2 transition signal at half-field, which are characteristic of a multiplet species. [DOI 10.1295/polymj.37.284] KEY WORDS Dendrimer / Triphenylmethane / Galvinoxyl Radical / High-spin Molecule / Non-Kekule´ Structure / The synthetic research of high-spin molecules and polymers for a purely organic-derived magnetic mate- O O rial has been of current interest in the past two de- O O cades.1–4 High-spin molecules have been synthesized based on the molecular design to satisfy a -conjugat- H O ed, but non-Kekule´ and non-disjoint connectivity Yang's biradical Galvinoxyl radical among the multiple radical sites or nonbonding molec- ular orbitals of the unpaired electrons, which realizes a Chart 1. strong through-bond ferromagnetic exchange interac- tion.5–9 Organic radicals with both chemical stability and spin-delocalization are desirable spin sources for composed of galvinoxyl residues and a stable triplet the high-spin molecules. Meta-connected triphenyl- biradical.19 methyl radicals have been extensively studied as such In this study, we combine a triphenylmethyl radical a spin source by one of the coauthors (A.R.). This work and a galvinoxyl radical based on the molecular de- eventually led to a highly cross-linked network poly- sign such that a triphenylmethyl radical is substituted mer with a magnetic ordering and a huge magnetic at the para-positions with galvinoxyl radicals both to moment corresponding to S (spin quantum number) > sterically protect the triphenylmethyl radical and to 5000.10–13 However, the triarylmethyl radical survives delocalize the spins over the -conjugated mole- only below 170 K. Chemically stable radicals would cule.20,21 The triphenylmethyl radical combined with facilitate studies of super high-spin molecules for a galvinoxyl radical is expected to became a new, sta- molecular-based magnetic materials. ble high-spin molecule. The second aspect of the mo- The galvinoxyl radical formed through the oxida- lecular design is a branched coupling pathway among tion of 3,30,5,50-tetra-tert-butyl-4,40-dihydroxydiphen- the radical spins to give a strong spin-exchange inter- ylmethane is a stable phenoxyl-based radical at ambi- action in the -conjugated system. A dendritic exten- ent conditions, and can be isolated as a crystal.14–16 Its sion is applied in this study to synthesize a well and chemical and magnetic properties have been well regularly branched -conjugated structure by satisfy- studied, and it has also been extended to homologous ing a formal requirement for high-spin ground state, oligomers,17,18 such as Yang’s biradical which is i.e., non-Kekule´ and nondisjoint connectivity. A high- yTo whom correspondence should be addressed (E-mail: [email protected]). yyTo whom correspondence should be addressed (E-mail: [email protected]). 284 Dendritic Triphenylmethanes Terminated with Galvinoxyl Radicals er was dried over magnesium sulfate. After removal of OY O OY the solvent, the recrystallization from hexane gave (4- X bromophenyl)-bis(4-tert-butylphenyl)methanol (8.91 g, O YO X O Yield 53%) as a white crystal (mp 181.0–181.4 C): 1 O OY 1 H NMR (CDCl3, 500 MHz) 7.42 (d, J ¼ 8:6 Hz, X YO O 4H, aryl), 7.32 (d, J ¼ 8:6 Hz, 2H, aryl), 7.20 (d, J ¼ YO X X O 8:6 Hz, 4H, aryl), 7.15 (d, J ¼ 8:6 Hz, 2H, aryl), 2.70 13 (s, 1H, OH), 1.31 (s, 18H, t-Bu); C NMR (CDCl3, O X OY O OYO OY 500 MHz) 150.29, 146.19, 143.53, 130.82, 129.64, 3 127.45, 124.85, 121.11, 81.36, 34.47, 31,35; (KBr À1 OY 2 O a : OMe d : H pellet): 3582 ( O{H), 2961 cm ( Ar C{H); Mass: calcd X = b : - Y = e : - for M 451.44, found (m=z) 451 (Mþ). c: f : (4-Bromophenyl)-bis(4-tert-butylphenyl)methoxy- methane 4. A 30 mL THF solution of (4-bromophen- Chart 2. yl)-bis(4-tert-butylphenyl)methanol (4.0 g, 8.86 mmol) was slowly added to the 300 mL THF suspension of 1ad 1af tetraanion 1cf sodium hydride (1.10 g, 44.3 mmol) and stirred at 0 C Na/K I2 2ad or 2af decaanion 2cf for 1 h. Iodomethane (8.80 mL, 142 mmol) was added, 3ad 3af docosaanion 3cf and the reaction mixture was allowed to warm to room temperature and stirred overnight. The mixture was Scheme 1. quenched with water. The resulting mixture was ex- tracted with ether, and the organic layer was dried er molecular weight extension may be attained using over magnesium sulfate. After removal of the solvent, the same iterative synthetic procedure.22,23 The den- the recrystallization from methanol gave (4-bromo- dritic extension is also expected to produce a high sol- phenyl)-bis(4-tert-butylphenyl)methoxymethane 4 vent-solubility of the polyradical and a chemical sta- (3.75 g, Yield 91%) as a white crystal (mp 171.3– 1 bility resulting from the terminal galvinoxyl groups. 172.6 C): H NMR (500 MHz, CDCl3) 7.40 (d, J ¼ In this paper, we report the synthesis of bis(4-tert- 8:9 Hz, 2H, aryl), 7.34 (d, J ¼ 8:9 Hz, 2H, aryl), 7.30– butylphenyl)-(4-hydrogalvinoxylphenyl)methoxyme- 7.29 (m, 8H, aryl), 3.03 (s, 3H, methoxy), 1.30 (s, 13 thane 1ad, which is a simple model of the triphen- 18H, t-Bu); C NMR (500 MHz, CDCl3) 149.85, ylmethane combined with a hydrogalvinoxyl group 144.44, 140.06, 130.73, 130.15, 128.45, 124.68, at the para-position, and the dendritic extensions, 120.64, 86.39, 52.02, 34.41, 31.35; IR (KBr pellet): À1 tris(4-hydrogalvinoxylphenyl)methoxymethane 2ad 2957 (Ar C{H), 1267 cm (C{O{C); Mass: calcd for and tris[4-{bis(4-hydrogalvinoxylphenyl)methoxy- M 465.47, found (m=z) 465 (Mþ). methyl}phenyl]methoxy methane 3ad. These com- Bis(4-tert-butylphenyl)-(4-formylphenyl)methoxy- pounds, 1ad, 2ad, and 3ad, were reduced to the corre- methane. A 1.6 M hexane solution (4.00 mL) of n-bu- sponding tetraanion, decaanion, and docosaanion, re- tyllithium (6.45 mmol) was slowly added to a 65 mL spectively, and oxidized to the corresponding radicals, THF solution of (4-bromophenyl)-bis(4-tert-butylphe- 1cf, 2cf, and 3cf, respectively. The preparation of nyl)methoxymethane 4 (3.00 g, 6.45 mmol) at À78 C these radicals and their magnetic properties were also under N2. The solution was warmed to 0 C and stirred discussed. for 30 min. Dimethylformamide (1.5 mL, 9.68 mmol) was added slowly, and the reaction mixture was stir- EXPERIMENTAL red for 20 h at room temperature. The mixture was quenched with aqueous ammonium chloride solution. (4-Bromophenyl)-bis(4-tert-butylphenyl)methanol. The resulting mixture was extracted with ether, and A 1.6 M hexane solution (52.0 mL) of n-butyllithium the organic layer was dried over magnesium sulfate. (81.2 mmol) was slowly added to a 410 mL THF solu- After removal of the solvent, the purification by chro- tion of p-bromo-tert-butylbenzene (17.4 g, 81.8 mmol) matography with a silica gel column and a chloroform at À78 C under N2. The solution was warmed to 0 C eluent gave bis(4-tert-butylphenyl)-(4-formylphenyl)- and stirred for 30 min. The solution was cooled to methoxymethane (2.20 g, Yield 35%) as a white pow- 1 À78 C again, and methyl p-bromobenzoate (8.00 g, der: H NMR (CDCl3, 500 MHz) 9.97 (s, 1H, form- 2.23 mmol) was added dropwise. The resulting mix- yl), 7.80 (d, J ¼ 8:2 Hz, 2H, aryl), 7.68 (d, J ¼ 8:2 ture was stirred for 20 h at À78 C, and quenched with Hz, 2H, aryl), 7.33–7.29 (m, 8H, aryl), 3.05 (s, 3H, 13 aqueous ammonium chloride solution. The resulting methoxy), 1.31 (s, 18H, t-Bu); C NMR (CDCl3, mixture was extracted with ether, and the organic lay- 500 MHz) 192.01, 152.79, 150.16, 139.38, 134.71, Polym. J., Vol. 37, No. 4, 2005 285 E. FUKUZAKI et al. 129.25, 128.76, 128.39, 86.70, 52.079, 34.46, 31,35; tert-butylphenyl)-(4-hydrogalvinoxylphenyl)methoxy- À1 (KBr pellet): 2962 (Ar C{H), 1728 cm (C=O); Mass: methane 1ad as a red powder (96 mg, Yield 53%); þ 1 calcd for M 476.18, found (m=z) 476 (M ).
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