Bromide groups

Synthesis and Characterization of New Type Soluble Porphyrazine Containing 3-PhenyIpropyl Bromide Group and Investigation of Its Complexes... 

Figure 6. SEC profiles of PI-6-PS-6-PI triblock copolymer chains end-capped with butyl bromide group (SI44) before and after the coupling reaction in n-hexane, with the self-assembly as well as in THF without the self-assembly.

Similarly, metathetical exchange of the labile acetonitrile ligands in the octahedral molybdenum complex (CO)2(MeCN)2BrMo( 3-C3Ph3) with a variety of bidentate amines led to the corresponding amino complexes (equation 267)311. These form crystalline acetonitrile solvates suitable for X-ray determination, which confirm the octahedral structure of these complexes and the occurrence of the cyclopropenyl and bromide groups in a tram-relationship. 

Reduction of acyl chlorides to aldehydes,13 Tri-n-butyltin hydride reduces acyl chlorides to a mixture of aldehydes and esters. In the presence of a soluble Pd catalyst usually Pd[P(C6H5)3]4, only aldehydes obtain. This reduction is very general, and yields are usually > 80%. Reduction of double bonds is a minor competing reaction with a, / -unsaturatcd substrates (< 5% reduction). Of other reducible groups, only an allylic bromide group competes with the COC1 group. 

Triphenylamine derivatives are known to be efficient hole transport materials and are widely used in organic light-emitting devices. Thelakkat et al. reported the synthesis of a 2,2-bipyridine ligand capped with polyfvinyl-triphenylamine) at both ends.97 The polymer chain was synthesized by the atom transfer radical polymerization of 4-bromostyrene using 4,4-bis (chloromethyl)bipyridine as the initiator (Scheme 18). The bromide groups were then replaced by diphenylamine in the presence of palladium catalyst. Polymer 33 was then obtained by the metalation reaction. 

The highly reactive 2-amino and 1-bromide groups are sterically remote in the preferred conformation LXVI, and intramolecular reaction does not occur. The (theoretically possible) ethyleneimine hydrobromide struc-... 

Replacement, by hydrogen, 36, 95 dimethylethylammonium bromide group by acetate, 34, 58 hydrogen of hydroxyl by chlorine atom, 32, 20... 

Functional groups have also been placed on surfaces of organic colloidal particles prepared in an emulsion process. Vairon et al. applied ATRP to the homopolymerization of 2-hydroxyethyl acrylate (HEA) and 2-(methacryloyloxy)ethyl tri-methylammonium chloride from the surface of a crosslinked polystyrene latex functionalized with alkyl bromide groups. ATRP was carried out using the surface groups of the dialyzed latex as the initiators. The resulting hydrophobic core/hy-... 

Heck polycyclization of dienynes. Treatment of dienyne 1 bearing a vinyl bromide group with catalytic amounts of Pd(OAc)2 and P(Q,H5)3 and 2 cquiv. of silver carbonate in CH,CN at 80° results in the tricyclic cyclohexadicne 2 in 60% yield. A similar reaction occurs if the dicnync group is attached to a cyclohexane ring (3 — 4, equation I). 

Br bond originated from the head-to-head chain propagation (i) was also found in the polymer. Based on the integration ratio of peak g and peak b, 89% of terminal bromide was found to be preserved. The number average molecular weight of PVAc was estimated to be 4230 from the integration of peak f and peak b, which is very close to the value (4500) measured by GPC. The presence of the terminal carbon-bromide group further proved that the VAc polymerization by the catalyst of CuBr/tPy was an ATRP process. 

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